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    • 专利摘要:
    abstract a steel contains each of c, si, mn, p, s, al, n, o, with the balance made up of fe and inevitable impurities, at a range from 1/8 thickness centered around a 1/4 sheet thickness from a surface to 3/8 thickness centered around the 1/4 sheet thickness from the surface to a base steel sheet, a structure of the base steel sheet contains, in volume fraction, 3? or more of a retained austenite phase, 50? or less of a ferrite phase, and 40? or more of a hard phase, an average dislocation density is 5? 1013 / m2 or more, a solid-solution c amount contained in the retained austenite phase is in mass? 0.70 to 1.00 ?, an x-ray random intensity ratio of fcc iron in a texture of the retained austenite phase is 3.0 or less, the ratio between a grain diameter relative to a rolling direction and a grain diameter relative to a sheet width direction of the retained austenite phase is 0.75 to 1.33, further the hot dip galvanized layer is formed at the surface of the base steel sheet and the sheet thickness becomes 0.6 to 5.0 mm. patent summary: "high strength hot-dip galvanized steel sheet, high-strength alloy hot-dip galvanized steel sheet excellent in temperability, and production method thereof". one plate contains each of c, si, mn, p, s, al, n, o, with the remainder composed of f and inevitable impurities, in a 1/8 thickness range centered around a 1/4 plate thickness From a surface thickness 3/8 centered around the sheet thickness 1/4 from the surface on a base steel plate, a base steel plate structure contains, in volume fraction, 3? or more than one residual austenite phase, 50? or less of a ferrite phase, and 40? or more than one hard phase, an average displacement density is 5? 1013 / m2 or more, is an amount of solid solution contained in the residual austenite phase by weight? 0.70 to 1.00 ?, an iron fcc x-ray random intensity ratio in a texture of the residual austenite phase is 3.0 or less, a ratio between a grain diameter relative to a rolling direction and a grain diameter relative to one direction of the residual austenite phase sheet width is 0.75 to 1.33, furthermore, a hot dip galvanized layer is formed on the surface of the base steel sheet, and the thickness of the sheet becomes 0.6 to 5.0 mm.
    公开号:BR112014007498B1
    申请号:R112014007498-4
    申请日:2012-09-28
    公开日:2019-04-30
    发明作者:Hiroyuki Kawata；Naoki Maruyama；Akinobu Murasato；Akinobu Minami；Takeshi Yasui；Takuya Kuwayama；Hiroyuki Ban；Kaoru Hiramatsu
    申请人:Nippon Steel & Sumitomo Metal Corporation；
    IPC主号:
    专利说明:

    Descriptive Report of the Invention Patent for HOT GALVANIZED STEEL SHEETS OF HIGH RESISTANCE AND THE SAME PRODUCTION METHOD.
    TECHNICAL FIELD [001] The present invention relates to a high strength hot dip galvanized steel sheet, a hot dip galvanized steel sheet with high strength alloy, excellent in hardenability, and a method of their production.
    PRECEDENT TECHNIQUE [002] In recent years, the requirement for high strength of a steel plate used for a vehicle and so on has become high, and a high strength steel plate whose maximum stress stress is 900 MPa, or more, comes to be used. On the other hand, it is required to show excellent forming operability in a forming operation time, such as pressing operation. However, improvement in strength makes it easier to incur deterioration in training operability, and it is difficult to satisfy both requirements.
    [003] Consequently, in recent years, a steel sheet using hardenability (BH capacity) by a coating / baking process (hardening process) after the forming operation, has been developed so that operability, such as ductility and expandability borehole, and high strength, are both enabled.
    [004] Here, hardenability is a phenomenon where C (solid solution C) and N (solid solution N) remaining on a steel plate in a state of solid solution diffuse to disagreements in a cooking process (usually heated) to approximately 170 ° C, then held for several dozen minutes) after
    Petition 870180145531, of 10/29/2018, p. 8/111
    2/82 coating, discrepancies are fixed, and thus, a yield resistance increases. The increased amount of yield strength is an amount of coated hardenability (amount of BH), and the amount of BH is generally known to increase by increasing an amount of solid solution C, or an amount of solid solution N.
    [005] In Patent Literature 1, a cold-rolled steel sheet is revealed in which a hard structure produced from bainite and martensite is the main structure of this, and a high amount of hardenability is ensured by limiting a fraction of ferrite in 5% or less.
    [006] Furthermore, in Patent Literature 2, a high-strength cold-rolled steel sheet is revealed in which bainite is a main structure of it, a hardness ratio between bainite and ferrite is made small, and dispersion of hardness in each structure is made small in order to improve the hardenability, ductility, and hole expandability.
    [007] Furthermore, in Patent Literature 3, a method is disclosed in which a steel sheet is produced to be one containing tempered martensite and / or tempered bainite obtained by annealing a hot-rolled steel sheet without realization cold rolling, or annealing twice after cold rolling to thereby improve operability and hardenability.
    [008] Furthermore, in one of the Patent Literatures 4, 5 and 6, a technique improving the hardenability by adding a batch of N is revealed.
    CITATION LIST
    PATENT LITERATURE [009] Patent Literature 1: Patent Publication Open to
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    3/82
    Japanese Public No. 2008-144233 [0010] Patent Literature 2: Patent Publication Open to Japanese Public No. 2004-263270 [0011] Patent Literature 3: Patent Publication Open to Japanese Public No. 2003-277884 [0012] Patent Literature 4: Japanese Patent Publication No. 2005-023348 [0013] Patent Literature 5: Japanese Patent Publication No. 2003-049242 [0014] Patent Literature 6: Patent Publication Open to Japanese Public No. 2001-247946
    SUMMARY OF THE INVENTION TECHNICAL PROBLEM [0015] However, in Patent Literature 1 and 2, mention is made of the amount of hardenability, but the anisotropy of hardenability is not mentioned, and it is extremely unstable whether or not it is not possible to stably secure a desired amount of temperability.
    [0016] In addition, in the Patent Literature 3 method, cold rolling is not performed, and therefore there is a problem where the accuracy of the sheet thickness of the steel plate deteriorates. In addition, even if cold rolling is carried out, the annealing step after cold rolling is carried out twice, and there is a problem where the cost of production increases.
    [0017] In addition, in Patent Literatures 4, 5 and 6, an additional batch of N is required to ensure the amount of hardening, and there is a possibility that weldability is impaired.
    [0018] The present invention is produced in consideration of the circumstances as mentioned above, and an objective of this is to provide a hot dip galvanized steel sheet of
    Petition 870180145531, of 10/29/2018, p. 11/101
    4/82 high strength, a hot dip galvanized steel sheet with high strength alloy that ensures high strength of a maximum tensile strength of 900 MPa or more, excellent ductility, and excellent in hardenability, and a method of producing these .
    SOLUTION TO THE PROBLEM [0019] The present inventors studied hard to solve the problems mentioned above. As a result, they found that it is possible to obtain a steel sheet whose amount of hardness is large, and having isotropic hardness, while ensuring high tensile strength of 900 MPa or more, and excellent ductility, by increasing a medium discrepancy density in the steel plate, weakening the anisotropy of an austenite texture, and enabling anisotropic structure.
    [0020] The Summary of the present invention in order to solve the problems mentioned above is as follows.
    [0021] [1] a high-strength hot-dip galvanized steel sheet, excellent in hardness, includes a base steel sheet containing by weight% C: 0.075 to 0.400%, Si: 0.01 to 2, 00%, Mn: 0.80 to 3.50%, P: 0.0001 to 0.100%, S: 0.0001 to 0.0100%, Al: 0.001 to 2.00%, N: 0.0001 to 0 .0100%, O: 0.0001 to 0.0100% each, with the rest composed of Fe and unavoidable impurities, in which a structure of the base steel plate contains, in fraction of volume, 3% or more of a phase of residual austenite, 50% or less of a ferrite phase, and 40% or more of a hard phase, in a 1/8 thick strip centered around a 1/4 sheet thickness of a 3/8 thick surface centered around the plate thickness 1/4 from the surface in the base steel plate, an average discrepancy density is 5 x 10 13 / m 2 or more, an amount of solid solution C contained in the residual austenite phase is in mass%, 0.70 to 1.00%, a ratio of
    Petition 870180145531, of 10/29/2018, p. 11/111
    5/82 random FCC iron X-ray intensity in a residual austenite phase texture is 3.0 or less, a ratio between a grain diameter relative to a rolling direction and a grain diameter relative to a direction of plate width of the residual austenite phase is 0.75 to 1.33, yet a hot dip galvanized layer is formed on the surface of the base steel plate, and the thickness of the plate becomes 0.6 to 5, 0 mm.
    [0022] [2] the hot-dip galvanized steel sheet of high resistance, according to [1], in which the hard phase is composed of a bainitic ferrite phase and / or a bainite phase, a tempered martensite, and a fresh martensite stage.
    [0023] [3] the hot-dip galvanized steel sheet of high resistance, excellent in hardness, according to [1], in which oxides are finely dispersed, and a decarbonized layer whose thickness is 0.01 mm to 10 , 0 mm is formed in a surface layer portion of the base steel plate, and an average grain diameter of the oxides is 500 nm or less, and an average density is 1.0 x 10 12 oxides / m 2 or more .
    [0024] [4] the hot-dip galvanized steel sheet of high resistance, excellent in hardness, according to [1], additionally containing, by weight%, one type or two types or more from Ti: 0.001 to 0.150%, Nb: 0.001 to 0.100%, V: 0.001 to 0.300%.
    [0025] [5] the hot-dip galvanized steel sheet with excellent resistance to hardness, according to [1], additionally containing by weight% one type or two types or more from Mo: 0.01 to 2.00%, W: 0.01 to 2.00%, Cr: 0.01 to 2.00%, Ni: 0.01 to 2.00%, Cu: 0.01 to 2.00%, B : 0.0001 to 0.0100%.
    [0026] [6] the hot-dip galvanized steel sheet of high resistance, excellent in hardness, according to [1], additionally containing by weight% one type or two types or more from Ca,
    Petition 870180145531, of 10/29/2018, p. 11/111
    6/82
    Ce, Mg, Zr, La, REM to 0.0001 at 0.0100% as a total.
    [0027] [7] hot-dip galvanized steel sheet with high-strength alloy, excellent in hardness, in which an alloy treatment is carried out on the hot-dip galvanized layer formed on a surface of the high-strength steel sheet, according to [1].
    [0028] [8] a method of producing a high-strength hot-dip galvanized steel sheet, excellent in hardness, including: a hot-rolling step of heating a plate having a chemical component containing, by weight% , C: 0.075 to 0.400%, Si: 0.01 to 2.00%, Mn: 0.80 to 3.50%, P: 0.0001 to 0.100%, S: 0.0001 to 0.0100%, Al: 0.001 to 2.00%, N: 0.0001 to 0.0100%, O: 0.0001 to 0.0100% each, with the remainder of Fe and unavoidable impurities, at 1180 ° C or more, leaving of hot rolling using plural passes, hot rolling is carried out in which a relationship between a “T” temperature of a hot rolled steel sheet within a range of 1050 ° C at a finishing temperature of lamination, a sheet thickness "h", and an elapsed time "t" between each pass satisfy the following expression (1), and finalization of the lamination in a temperature range of 880 ° C or more; a first cooling step from the start of cooling after a time elapsed after the completion of the hot rolling to the start of cooling is set to be 1.0 seconds or more, and cessation of cooling to 450 ° C or more; a cold rolling step of setting the time elapsed after the first cooling down to 400 ° C to be 1.0 hour or more, and then a cold rolling is performed while adjusting a total reduction ratio for be 30 to 75%; a continuous annealing step of annealing at a maximum heating temperature of (Ac3 50) ° C or more; and a coating step forming a
    Petition 870180145531, of 10/29/2018, p. 11/13
    7/82 hot dip galvanized layer on a steel sheet surface by immersing the steel sheet inside the galvanizing bath after the continuous annealing step.
    [Numeric Expression 1]
    · (1) [0029] Here, in expression (1), “N” represents a total number of passes from the start of the hot rolling to completion, “i” represents an order of passes, “Ti” represents a temperature lamination rate (° C) in passage i a , “hi” represents a thickness of the plate (mm) after processing passage ia, “ti” represents a time elapsed from passage ia to the next passage. Note that when i = 1, ho = a plate thickness. In addition, an elapsed time from one final pass to the next pass is an elapsed time from the final pass to the start of cooling time after the hot rolling is completed.
    [0030] [9] the production method of hot-dip galvanized steel sheet of high strength, excellent in hardness, according to [8], in which in the coating step, oxides are generated in a portion of layer of steel plate surface in a preheating zone where an air ratio being a ratio between a volume of air contained in the gas mixed in a unit volume in the mixed gas of air and fuel gas used for heating, and a volume of air theoretically required to enable complete combustion of the fuel gas contained in the gas mixed in a unitary volume it is adjusted to 0.7 to 1.2, subsequently the oxides are reduced to a reduction zone where a partial pressure ratio (P (H2Ü) / P ( H2)) between H2O and H2 is adjusted to be 0.0001 to 2.0, and in
    Petition 870180145531, of 10/29/2018, p. 11/141
    8/82 then, the steel sheet is immersed inside the galvanizing bath under a condition in which a coating bath temperature is 450 to 470 ° C, a temperature of the steel sheet in the time it enters the interior of the bath. coating is 430 at 490 ° C, an effective amount of Al in the coating bath is 0.01 to 0.18 mass%, to thereby form the hot dip galvanized layer on the surface of the steel sheet.
    [0031] [10] the production method of the high-strength hot-dip galvanized steel sheet, excellent in hardness, according to [8], additionally including: a tempering lamination step of performing a sheet rolling steel with a reduction ratio of 5.00% or less, after the coating step.
    [0032] [11] a method of producing hot-dip galvanized steel sheet with high-strength alloy, excellent in hardenability, including: forming hot-dip galvanized layer alloy after hot-dip galvanized steel sheet high-strength hot water is produced by the production method, according to [8].
    [0033] [12] the production method of hot-dip galvanized steel sheet with high-strength alloy, excellent in hardness, according to [11], additionally including: a tempering lamination step of carrying out a lamination steel sheet with a reduction ratio of less than 10% after the hot dip galvanized layer is bonded.
    ADVANTAGE EFFECTS OF THE INVENTION [0034] It is possible for a hot-dip galvanized steel sheet of high strength, a hot-dip galvanized steel sheet with high-strength alloy, according to the present invention, to join C to a batch disagreement, and increase a quantity C on a steel plate because the density of
    Petition 870180145531, of 10/29/2018, p. 11/15
    9/82 medium enough disagreement is supplied by defining a microstructure of the steel sheet in a predetermined fraction. As a result, it is possible to increase an amount of hardenability. In addition, it is possible to produce unstable residual austenite by reducing an amount of solid solution C in the residual austenite, and easily transform the residual austenite into martensite by a forming operation, and so on. As a result, it is possible to increase the amount of hardenability. Additionally, the residual austenite is transformed into extremely hard martensite, as mentioned above, and, thus, mobile discordance is introduced in a periphery of a martensite structure, and, therefore, it is possible to additionally ensure an amount of temperability.
    [0035] In addition, it is possible to enable an isotropic structure of residual austenite by reducing a random X-ray intensity ratio of FCC iron from the texture of the residual austenite. Consequently, it is possible to make it become isotropic martensite by processing such a subsequent forming operation, and therefore it is possible to obtain isotropic hardenability. In addition, a crystal grain pattern of the residual austenite is defined, and thus a transformation ratio in the martensite, depending on a processing direction, is capable of being produced stably constant, and the temperability obtained by the transformation of martensite can be made isotropic.
    [0036] As mentioned above, it is possible for the hot-dip galvanized steel sheet of high strength, and the hot-dip galvanized steel sheet with high-strength alloy, in accordance with the present invention, to ensure sufficient quantity temperability, and obtain the isotropic temperability. It is thus possible to greatly improve the hardenability in addition to the
    Petition 870180145531, of 10/29/2018, p. 11/16
    10/82 improvement in resistance and ductility.
    [0037] In addition, the steel plate, according to the present invention, is capable of providing isotropic hardness, and therefore it is possible to design, without limitation, a direction of use of the steel plate, according to present invention, when it is applied to a limb and so on.
    [0038] In addition, in the production method of high-strength hot-dip galvanized steel sheet, and hot-dip galvanized steel sheet with high-strength alloy, according to the present invention, it is possible to enable desired microstructure having sufficient discrepancy density, and suppress the development of the austenite texture to weaken the anisotropy of the austenite structure by defining the conditions of the hot rolling step and the subsequent cooling step. Consequently, it is possible to produce the martensite structure transformed by subsequent isotropic processing, and to improve temperability. In addition, in the coating step, before and after immersing the steel sheet inside the coating bath, the steel sheet is retained at a temperature range of 300 to 470 ° C for a predetermined time to accelerate the transformation of bainite. It is thus possible to control the amount of solid solution C in the residual austenite obtained in the annealing step, and to make the residual austenite unstable. As a result, residual austenite is easy to turn into martensite in processing and is a subsequent step to increase the amount of hardenability.
    DESCRIPTION OF THE CONCRETIZATIONS [0039] Hereafter, a hot-dip galvanized steel sheet of high strength, a hot-dip galvanized steel sheet with high-strength alloy, excellent in hardenability, and
    Petition 870180145531, of 10/29/2018, p. 11/171
    11/82 a method of producing them, according to the present invention, are described in detail.
    [0040] <High-strength hot-dip galvanized steel sheet>
    [0041] The high-strength hot-dip galvanized steel sheet, according to the present invention, is characterized in that a base steel sheet contains, by weight,% C: 0.075% to 0.400%, Si: 0, 01 to 2.00%, Mn: 0.80 to 3.50%, P: 0.0001 to 0.100%, S: 0.0001 to 0.0100%, Al: 0.001 to 2.00%, N: 0 .0001 to 0.0100%, O: 0.0001 to 0.0100%, with the remainder of Fe and unavoidable impurities, a structure of the base steel plate contains, in volume fraction, 3% or more of a phase residual austenite, 50% or less of a ferrite phase, and 40% or more of a hard phase, in a 1/8 thick strip centered around a 1/4 sheet thickness of a surface at thickness 3 / 8 centered around the plate thickness 1/4 from the surface in the base steel plate, an average discrepancy density is 5 x 10 13 / m 2 or more, an amount of solid solution C contained in the residual austenite phase is , in mass%, 0.70 to 1.00%, a ratio of random intensity of X of iron FCC of a residual austenite phase texture is 3.0 or less, a ratio between a grain diameter relative to a rolling direction and a grain diameter relative to a plate width direction of the residual austenite phase is 0.75 to 1.33, yet a hot dip galvanized layer is formed on the surface of the base steel sheet, and the thickness of the sheet becomes 0.6 to 5.0 mm.
    [0042] Hereinafter, the reasons for limiting a steel sheet structure and a chemical component (composition) of the present invention are described. Note that a notation of “%” represents mass%, unless otherwise specified.
    (Plate thickness)
    Petition 870180145531, of 10/29/2018, p. 11/18
    12/82 [0043] A sheet thickness of a steel sheet to be applied is 0.6 to 5.0 mm. When it is less than 0.6 mm, it is not suitable because it is difficult to maintain a flat steel sheet shape, and when it exceeds 5.0 mm, a predetermined microstructure cannot be obtained because it becomes difficult to cool evenly inside the steel sheet.
    (Microstructure) [0044] The microstructure of the base steel sheet of the high-strength hot-dip galvanized steel sheet of the present invention has a predetermined chemical component, and contains, in fraction of volume, 3% or more of an austenite phase residual (hereinafter, referred to as residual austenite), 50% or less of a ferrite phase (hereinafter, referred to as ferrite), and 40% or more of a hard phase, in a 1/8 centered thickness range around a plate thickness 1/4 of a surface the thickness 3/8 centered around the plate thickness 1/4 from the surface on the steel plate.
    “Ferrite” [0045] Ferrite is a structure whose performance stress is low, and has an excellent operational hardening property. Consequently, when a fraction of ferrite is excessively increased, the resistance before a hardening process increases, and the yield stress after the hardening process decreases, and therefore the hardness deteriorates greatly. Therefore, the fraction of ferrite in the steel plate is adjusted to be 50% or less. The ferrite fraction is preferably 45% or less, and more preferably 40% or less, to further increase the hardenability. A lower limit for the ferrite fraction is not particularly defined, and can be “0” (zero)%. However, the ferrite fraction is preferably 5% or more, and more preferably 10% or
    Petition 870180145531, of 10/29/2018, p. 11/191
    13/82 more, from a ductility point of view.
    “Residual austenite” [0046] Residual austenite is a structure having a crystal structure of FCC (cubic lattice with centered face), transforming into hard martensite during processing, such as a forming operation, and showing great hardening capacity. In addition, the martensite generated during processing quickly increases its yield stress as it is tempered at a low temperature in a hardening process, and therefore a large amount of hardiness can be obtained by increasing the volume fraction of the residual austenite . In addition, the residual austenite turns into martensite, and thus, a mobile discordance is introduced at a periphery of the martensite structure, and therefore the amount of hardenability can additionally be obtained. From these points of view, the volume fraction of the residual austenite is adjusted to be 3% or more. In addition, the volume fraction of the residual austenite is preferably 5% or more, and more preferably 7% or more, to increase ductility, along with the amount of hardenability.
    [0047] On the other hand, it is necessary to add a lot of austenite stabilizing elements, such as C and Mn, to obtain the residual austenite exceeding 30%, and the weldability significantly deteriorates; therefore, the volume fraction of the residual austenite is adjusted to be 30% or less. From a weldability point of view, the volume fraction of the residual austenite is preferably 25% or less, and more preferably 20% or less.
    [0048] An amount of the solid solvent austenite stabilizing element in the residual austenite determines the stability of the residual austenite, and changes in the amount of stress required for the transformation of the residual austenite into the martensite
    Petition 870180145531, of 10/29/2018, p. 11/20
    14/82 lasts. Consequently, an amount of solid solution element of the residual austenite is controlled to thereby control a hardening behavior, and it is possible to greatly improve the hardenability, ductility, and stress resistance.
    [0049] In the present embodiment, an amount of solid C solution being the stabilizing element of austenite is controlled so that the residual austenite is made to be unstable, and it is possible to easily transform the residual austenite into martensite with a slight amount of tension.
    [0050] In the present embodiment, the amount of carbon in solid solution in the residual austenite is adjusted to be 1.00% or less, because sufficient temperability cannot be obtained by the residual austenite which is excessively stable for processing. When the amount of solid solution carbon in the residual austenite exceeds 1.00%, the residual austenite becomes excessively stable, an amount of martensite generated by processing such as the forming operation before the hardening process becomes small, and sufficient hardenability cannot be achieved. The amount of carbon in solid solution in the residual austenite is preferably 0.96% or less, to efficiently transform the residual austenite into martensite. On the other hand, when the amount of solid solution carbon in the residual austenite is below 0.70%, a transformation of martensite begins during a cooling of the process at room temperature after an annealing step, and the fraction of the residual austenite cannot be obtained, and therefore the amount of carbon in the solid solution is adjusted to be 0.70% or more. The amount of carbon in the solid solution is preferably 0.75% or more, and more preferably 0.80% or more, to obtain a sufficient amount of residual austenite.
    Petition 870180145531, of 10/29/2018, p. 11/211
    15/82 [0051] Here, both of the following effects in a carbon adjustment of solid solution, where 1] a reduction in lamination and a temperature of 1050 ° C to a finish of finishing lamination are adjusted to be within a range of the expression described later (1), and 2] as more trade is described, it is kept at 300 to 470 ° C for 20 to 1000 seconds after annealing. Namely, the adjustment of the solid solution carbon cannot be substantially performed unless both 1] and 2] are satisfied.
    [0052] Namely, when the expression described later (1) is satisfied, the microstructure of a hot-rolled sheet becomes a homogeneous and thin structure, and pearlites on islands disperse evenly and finely. In this pearlite, Mn is secreted, and therefore, it is preferably substituted in the residual γ by passing through a phase transformation in the annealing step. The solid solution carbon is efficiently concentrated according to the phase transformation in the annealing step in the homogeneous and fine austenite to be a correct amount of solid solution carbon.
    [0053] On the other hand, when the expression (1) is below a specified range, recrystallization does not proceed, and therefore, the coarse perlite that extends in a lamination direction is generated. Residual austenite generated by passing through the annealing step becomes coarse extended austenite. Consequently, the carbon concentration resulting from the phase transformation is difficult to proceed, and the solid solution carbon does not become a correct range. In addition, a form of residual austenite becomes a problem.
    [0054] In addition, when the expression described below (1) is above the specified range, recrystallization proceeds excessively, and massive and coarse pearlite is generated. Austenite
    Petition 870180145531, of 10/29/2018, p. 11/22
    16/82 residual generated by passing through the annealing step becomes massive and coarse austenite. Consequently, the carbon concentration resulting from the phase transformation is difficult to proceed, and the carbon in the solid solution does not become the correct range. In addition, the shape of the residual austenite becomes the problem.
    [0055] Note that the amount of solid solution C (Cg) in the residual austenite is able to be found by performing an X-ray diffraction test under the same condition as a measurement of a fraction of the area of the residual austenite , finding a lattice constant “a” for residual austenite, and using the following expression (2). Note that the expression (2) is revealed in a document “Scripta Metallurgica et Materialia, vol.24.1990. p509-514 ”.
    [Numerical Expression 2] „(a-0.3556) 12.01
    C = ------------ x ----- · (2} '0.00095 55.84 [0056] In addition, the transformation of residual austenite into martensite, according to processing, is affected by a crystal orientation of the residual austenite. Consequently, when the crystal orientation of the residual austenite deflects strongly, a rate of transformation into martensite relative to a degree of processing changes, depending on a processing direction, and the amount of temperability changes. , to obtain the amount of isotropic hardenability, it is necessary to produce the crystal orientation of the random residual austenite so that the ratio of transformation to the martensite relative to the degree of processing is constant, even if the processing is carried out in any direction.
    [0057] As for the deflection of the austenite crystal orientation
    Petition 870180145531, of 10/29/2018, p. 11/23
    17/82 residual, it is possible to evaluate a degree of it by measuring a texture of the iron crystal FCC by the X-ray diffraction method. Specifically, a random X-ray intensity ratio of the FCC iron can be verified from a crystal orientation distribution function (called an Orientation Distribution Function, ODF) representing a calculated three-dimensional texture based on the plural pole figures of between {200}, {311}, {220} measured by X-ray diffraction.
    [0058] In the present embodiment, it is necessary to adjust the random X-ray intensity ratio of the FCC iron of the residual austenite texture by 3.0 or less, to sufficiently reduce the temperability anisotropy, and to obtain the amount of isotropic temperability . The lower the random intensity ratio is, the greater it is preferable to reduce anisotropy, and it is preferably 2.5 or less, and more preferably 2.0 or less. A lower limit of the random intensity ratio is not particularly limited, but it is industrially extremely difficult to adjust it to less than 1.2, and therefore it is preferably 1.2 or more.
    [0059] Note that the random X-ray intensity ratio is a numerical value in which the X-ray intensities of each of a standard sample that does not have an integration in a specific orientation and a material sample are measured under the same condition by the X-ray diffraction method, and so on, and the X-ray intensity obtained from the sample material is divided by the X-ray intensity of the standard sample.
    [0060] The production of samples for X-ray diffraction can be performed as mentioned below.
    [0061] First, a steel plate is polished to a predetermined position in a direction of the thickness of the plate by mechanical polishing, chemical polishing, and so on, the tension is removed
    Petition 870180145531, of 10/29/2018, p. 11/24
    18/82 by electrolytic polishing and chemical polishing, as needed, and at the same time, it is adjusted so that a 1/4 thickness of the plate portion becomes a measuring surface. Note that it is difficult to precisely adjust the measuring surface to 1/4 thickness of the plate portion, and therefore the sample can be produced such that a surface within a range of 3% relative to the plate thickness around a target position becomes the measurement surface. In addition, when X-ray diffraction measurement is difficult, a statistically large number of measurements can be performed by an EBSD method.
    [0062] Additionally, when residual austenite crystal grains extend in a specific direction on a surface parallel to the plate surface, the ratio of transformation to martensite changes, depending on a processing direction, and therefore the anisotropy in the amount of temperability is generated. Namely, a pattern of the crystal grains of the residual austenite is defined, and in this way, it is possible to weaken the anisotropy in the amount of hardenability.
    [0063] In the present embodiment, when an average grain diameter of the residual austenite crystal grain relative to a rolling direction is set to d (RD), and an average grain diameter relative to a plate width direction is adjusted like d (TD), a “d (RD) / d (TD)” parameter, composed of both, is limited to be a range of 0.75 or more, and 1.33 or less. The "d (RD) / d (TD)" is preferably 0.80 or more, and 1.25 or less, and, more preferably, 0.85 or more, and 1.18 or less, to further reduce anisotropy of the amount of hardenability.
    [0064] It is noted that the crystal grain of the residual austenite is evaluated by finishing a surface parallel to the surface of the plate at 1/4 thickness on a mirror surface, using a FE-SEM
    Petition 870180145531, of 10/29/2018, p. 11/25
    19/82 (Field Emission Scanning Electron Microscopy), and performing a high resolution crystal orientation analysis using the EBSD method (Electron Bach-Scattering Diffraction). A measurement step is set to 0.1 mm, and a region in which points representing an iron diffraction pattern Ferro FCC adds 10 points or more, and a crystal disorientation between them is less than 10 ° is adjusted to be the crystal grain of the residual austenite. In this case, the crystal disorientation with a second proximity measurement point is verified at each measurement point, a point whose crystal disorientation is 10.0 ° or more, which is determined to belong to a different crystal grain, is ignored, and an average value of crystal disorientations with a second group of proximity measurement point whose crystal disorientation is 10.0 ° or less, which are determined to be within the same crystal grain, is found. As for the grain diameter, the grain diameter in the lamination direction and in the direction of the plate width are each measured in 30 pieces to 300 pieces of residual austenite crystal grains selected at random. “Hard phase” [0065] In the present embodiment, the hard phase is contained to 40% or more, in addition to ferrite and residual austenite. It is noted that as the hard phase, it is desired that a bainitic ferrite phase, and / or a bainite phase, a tempered martensite phase, and a fresh martensite phase, are contained in the complex. This hard phase is a generic of a transformation product that is harder than the ferrite phase. "Bainitic and / or Bainite ferrite" [0066] Bainitic and / or bainite ferrite is a necessary structure to efficiently obtain residual austenite, and is preferably contained in the steel plate structure to 10 to 80% by volume fraction. In addition, bainitic ferrite and / or bainite is a microstructure having an intermediate intensity between soft ferrite
    Petition 870180145531, of 10/29/2018, p. 11/26
    20/82 and hard martensite, tempered martensite and residual austenite, and is preferably contained to 15% or more, more preferably contained to 20% or more from a point of view of stretch flangeability. On the other hand, when the volume fraction of bainitic ferrite and / or bainite exceeds 80%, it is not preferable because there is a concern that yield stress excessively increases and ductility deteriorates. From a ductility point of view, the volume fraction of bainitic ferrite and / or bainite is preferably 70% or less, and more preferably 60% or less. “Tempered Martensite” [0067] Tempered martensite is a structure that greatly improves a resistance to tension, and it can be contained in the structure of the steel sheet by 50% or less, in fraction of volume. From a stress resistance point of view, the volume fraction of tempered martensite is preferably 10% or more. On the other hand, when the volume fraction of the tempered martensite contained in the steel sheet structure exceeds 50%, it is not preferable because the yield stress increases excessively, and there is a concern that the temperability deteriorates.
    “Fresh martensite” [0068] Fresh martensite greatly improves the resistance to tension, but on the other hand, it becomes a breaking point to deteriorate the stretching flangebility, and therefore it is preferably contained in the structure of the plate. steel to 25% or less, in volume fraction. The volume fraction of the fresh martensite is preferably 20% or less, more preferably 15% or less, to increase the stretch flangeability.
    “Other microstructures” [0069] Structures other than the above, such as pearlite and / or coarse cementite, may be contained in the microstructure of the sheet
    Petition 870180145531, of 10/29/2018, p. 11/271
    21/82 steel of the present invention. However, when a quantity of pearlite and / or coarse cementite becomes large in the steel plate structure of the high strength steel plate, the ductility deteriorates. Therefore, the volume fraction of pearlite and / or coarse cementite contained in the steel sheet structure is preferably 10% or less, as a total, and more preferably 5% or less.
    [0079] Note that the volume fraction of each structure contained in the steel sheet structure, as described above, can be measured by, for example, the method as illustrated below.
    [0080] The volume fractions of ferrite, residual austenite, bainitic ferrite, bainite, tempered martensite and fresh martensite contained in the steel plate structure of the steel plate of the present invention, are obtained by taking a sample of a cross section in parallel to the rolling direction of the steel sheet, and perpendicular to the sheet surface as an observation surface, polishing the observation surface, releasing nital stripping, and observing a strip of thickness 1/8 centered around plate thickness 1/4 of a surface to thickness 3/8 centered around plate thickness 1/4 from the surface with the field emission scanning electron microscope (FESEM) to measure a fraction of an area.
    (Average discrepancy density) [0081] Average discrepancy density (before loading) in the 1/8 thickness range around 1/4 plate thickness from the surface to 3/8 thickness around 1 / thickness 4 of the sheet from the surface of the base steel sheet, according to the present embodiment, is adjusted to be 1.0 x 10 13 / m 2 or more.
    [0082] Hereafter, the reasons for defining the density of average disagreement are described.
    [0083] It is very effective to add a lot of solution carbon
    Petition 870180145531, of 10/29/2018, p. 11/28
    22/82 solid to increase hardenability. However, the amount of carbon that dissolves solid in a BCC iron crystal is very small, and therefore it is effective that the average discrepancy density in the steel plate is increased by lowering the transformation temperature as much as possible so that the carbon adheres to a lot of disagreements to increase the amount of carbon in the solid solution. From this point of view, the average discrepancy density in the steel plate is adjusted to be 1.0 x 10 13 / m 2 or more. The higher the density of disagreement is, the easier the solid solution carbon is obtained, and therefore the average disagreement density is preferably 3.0 x 10 13 / m 2 or more, and, more preferably, 5.0 x 10 13 / m 2 or more. An upper limit of the density of disagreement is not particularly provided, but is preferably 1.0 x 10 17 / m 2 or less, and more preferably 3.0 x 10 16 / m 2 or less, because the ductility deteriorates dramatically when the density of disagreement exceeds 1.0 x 10 17 / m 2 .
    [0084] The density of disagreement is able to be found by the X-ray diffraction method, and a transmission electron microscope (TEM) observation. TEM is able to observe a minute region, and therefore it is possible to measure each of the discrepancy densities of the ferrite and the hard structure in the case of a multi-phase steel sheet. It is noted that in the observation of TEM, it is necessary to process the steel sheet inside a thin sheet state, or thin acicular in a sample production stage, and therefore it is difficult to create the sample, and there is a case when the density of disagreement is lowered because the displacement reaches a surface of the sample to disappear by a slight movement because the sample is small, and therefore a lot of attention is required to produce the sample. In addition, a measurable visual field is limited when observing TEM. On the other hand, in the diffraction method
    Petition 870180145531, of 10/29/2018, p. 11/29
    23/82 of X-rays, it is possible to measure the average discrepancy density over a wide region relatively easily. Consequently, the method of measuring the density of disagreement by using the X-ray diffraction method is used in the present invention.
    [0085] Note that the density of disagreement is obtained by controlling the fraction of the microstructure in a predetermined range, and performing an appropriate tempering lamination. This is because the discrepancy densities accumulated on the inner side are different, depending on the types of microstructures.
    (Decarbonized layer) [0086] Furthermore, in the high-strength hot-dip galvanized steel sheet of the present embodiment, the hardenability is improved by producing a portion of the surface layer in a decarbonized layer having a small amount of hard structure to disperse the fine oxides, thereby increasing the adhesiveness of a coating layer, increasing the yield stress of a base iron surface layer, and easily preventing yield after the hardening process. It is noted that the hard structure described here is composed of the hard layer listed above and the residual austenite.
    [0087] In the present embodiment, a thickness of the decarbonized layer formed in the surface layer portion of the base steel plate is adjusted to be within a range of 0.01 mm to 10.0 mm, an average grain diameter of the oxides finely dispersed in the decarbonized layer is 500 nm or less, and an average density of the oxides in the decarbonized layer is within a range of 1.0 x 10 12 oxides / m 2 or more.
    [0088] Hereafter, the reasons for limiting the above are described.
    [0089] The decarbonized layer having an appropriate thickness
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    24/82 is formed in the surface layer portion of the base steel sheet, and in this way it is possible to ensure the tensile strength and increase the adhesiveness between the base steel sheet and the coating layer. When the thickness of the decarbonized layer is less than 0.01 mm, the adhesiveness with the coating layer cannot be achieved sufficiently, and therefore, the thickness of the decarbonized layer is adjusted to be 0.01 mm or more. The thickness of the decarbonized layer is preferably 0.08 mm or more, and more preferably 0.15 mm or more, in order to further improve adhesiveness with the coating layer. On the other hand, an excessively thick decarbonized layer lowers the tensile strength and fatigue strength of the steel sheet. From this point of view, the thickness of the decarbonized layer is adjusted to be 10.0 mm or less. From a fatigue strength point of view, the thickness of the decarbonized layer is preferably 9.0 mm or less, and more preferably 8.0 mm or less.
    [0090] Note that the decarbonized layer is a region that continues from a higher surface of the base iron, and a region whose fraction of the hard structure is half or less than the fraction of the hard structure, the thickness of 1/4 of the plate base steel in the region.
    [0091] The cross section of the thickness parallel to the lamination direction is finished on the mirror surface, it is observed by the use of FE-SEM, the thicknesses of the decarbonized layer at three points or more are measured on a steel plate, and their average value is related to the thickness of the decarbonized layer. [0092] A resistance of the decarbonized layer formed in the surface layer portion of the base steel plate is low, and the fracture that starts from the decarbonized layer is difficult to occur, but there is a big difference in strength between an internal side of the steel sheet and the decarbonized layer, and therefore a
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    25/82 interface between the base iron and the decarbonized layer is able to function as a starting point for a new fracture. To prevent fracture, it is effective to disperse the oxides on an inner side of the crystal grain and / or a crystal grain boundary in the decarbonized layer, the strength of the decarbonized layer is increased to make the difference in strength with the inner side of small steel plate. The density of the oxides is adjusted to be 1.0 x 10 12 oxides / m 2 or more, to obtain sufficient strength. The density of the oxides is preferably 3.0 x 10 12 oxides / m 2 or more, and, more preferably, 5.0 x 10 12 oxides / m 2 or more, to further improve the low temperature hardness. On the other hand, when the oxide density exceeds 1.0 x 10 16 oxides / m 2 , a distance between the oxides becomes excessively close, the portion of the fracture surface layer by light processing to damage the formed coating layer in it, and therefore it is adjusted to be 1.0 x 10 16 oxides / m 2 or less. The density of the oxides is preferably 5.0 x 10 15 oxides / m 2 or less, and more preferably 1.0 x 10 15 oxides / m 2 or less, for the surface layer of the steel sheet to have enough formability.
    [0093] Note that the oxide described here means the oxide mainly containing Si and / or Mn.
    [0094] Furthermore, when an oxide size that disperses in the decarbonized layer is large, the oxide itself acts as the starting point for fracture, and therefore a fracture resistance property, such as ductility, deteriorates . Consequently, the average grain diameter of the oxide is adjusted to be 500 nm or less. The average grain diameter of the oxides is preferably 300 nm or less, and more preferably 100 nm or less, to further improve the fracture strength property, such as ductility. A lower limit of the average grain diameter of the oxide is not particularly provided, but it is necessary for
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    26/82 to strictly control a process atmosphere and a temperature to make it less than 30 nm, and it is practically difficult. Therefore, it is preferably 30 nm or more.
    [0095] As for the oxide in the decarbonized layer, the thick cross section in parallel to the lamination direction is finished on the mirror surface, and observed by the use of FE-SEM. The oxide density is found by counting the number of oxides by observing the decarbonized layer over an extension of 7 mm 2 , or by using an observation area required to count up to 1000 pieces of oxides. In addition, the average grain diameter of the oxide is an average of the grain diameters equivalent to a circle of 100 pieces to 1000 pieces selected at random.
    <Hot-dip galvanized steel sheet with high strength alloy>
    [0096] It is noted that a hot-dip galvanized layer formed on the surface of the high-strength hot-dip galvanized steel sheet, in accordance with the present embodiment, can be realized with an alloy treatment to be a sheet of hot-dip galvanized steel with high-strength alloy. The hot-dip galvanized steel sheet with high-strength alloy, thus obtained, is capable of showing similar effects to the high-resistance hot-dip galvanized steel sheet mentioned above.
    [0097] In addition, in the high-strength steel plate of the present invention, a coating film composed of a phosphorus oxide and / or a phosphorus-containing composite oxide can be formed on a hot dip galvanized layer surface , or in a hot-dip galvanized bonded layer. It can be made to work as a lubricant when the steel sheet is processed, and it is possible to protect the galvanization formed on the surface
    Petition 870180145531, of 10/29/2018, p. 11/33
    27/82 of the steel sheet.
    [0098] Next, the chemical component (composition) of the high strength hot dip galvanized steel sheet and the high strength alloy hot dip galvanized steel sheet of the present invention is described. Note that a sign [%] in the following description represents [mass%].
    [0099] "C: 0.075 to 0.400%" [00100] C is contained to increase the strength and hardenability of high-strength steel sheet. However, when a C content exceeds 0.400%, weldability becomes insufficient. From a weldability point of view, the C content is preferably 0.300% or less, and more preferably 0.250% or less. On the other hand, when the C content is less than 0.075%, the resistance is lowered, and it becomes difficult to ensure the maximum tensile strength of 900 MPa or more. The C content is preferably 0.085% or more, and more preferably 0.100% or more, to additionally increase strength and hardenability.
    [00101] "Si: 0.01 to 2.00%" [00102] Si is a necessary element to increase the strength and formability by generating iron-based carbide suppression, and obtaining a predetermined amount of residual austenite in the annealing step. However, when a Si content exceeds 2.00%, there is a case when the steel sheet is weakened, and cold rolling becomes difficult to do. Consequently, from a cold rolling point of view, the Si content is preferably 1.80% or less, and more preferably 1.50% or less. On the other hand, when the Si content is less than 0.01%, a batch of iron-based carbides is generated in the annealing step, a sufficient amount of residual austenites cannot be obtained, additionally a batch of carbides to the coarse iron base is generated during the treatment of
    Petition 870180145531, of 10/29/2018, p. 11/34
    28/82 alloy of the coating layer, and there is a possibility that the strength and formability will deteriorate. Consequently, the Si content is preferably 0.20% or more, and more preferably 0.50% or more.
    [00103] "Mn: 0.80 to 3.50%" [00104] Mn is added to the steel sheet of the present invention to increase the strength of the steel sheet. However, when an Mn content exceeds 3.50%, a concentrated portion of coarse Mn is generated at a central portion of the sheet thickness of the steel plate, embrittlement is easy to occur, and a problem such that a molten plate fracture is easy to occur. In addition, when the Mn content exceeds 3.50%, weldability also deteriorates. Consequently, the Mn content needs to be adjusted to 3.50% or less. From a weldability point of view, the Mn content is preferably 3.00% or less, and more preferably 2.70% or less. On the other hand, when the Mn content is less than 0.80%, a batch of soft structures is formed during cooling after annealing, and it becomes difficult to ensure the maximum tensile strength of 900 MPa or more. Therefore, it is necessary to adjust the Mn content to 0.80% or more. The Mn content is preferably 1.00% or more, and, more preferably, 1.30% or more, to additionally increase strength.
    [00105] "P: 0.0001 to 0.100%" [00106] P tends to segregate to the central portion of the sheet thickness of the steel plate, and weakens a weld zone. When a P content exceeds 0.100%, the weld zone is drastically weakened, and therefore the P content is limited to be 0.100% or less. From a embrittlement point of view, the P content is preferably 0.030% or less. It is noted that the present invention is shown without particularly limiting a lower limit of the P content, but the cost of production increases dramatically if the P content is adjusted to be less than
    Petition 870180145531, of 10/29/2018, p. 11/35
    29/82 than 0.0001%, and therefore 0.0001% is adjusted to be the lower limit value. In addition, it is preferably 0.0010% or more.
    [00107] “S: 0.0001 to 0.0100%” [00108] S adversely affects weldability and manufacturability at the time of casting and at the time of hot rolling. An upper limit value of an S content is therefore adjusted to be 0.0100% or less. In addition, S binds to Mn to form coarse MnS and lower ductility and stretch flangeability, and therefore is preferably 0.0050% or less, and more preferably 0.0025% or less. The present invention is shown without limiting particularly a lower limit of the S content, but the cost of production increases dramatically if the S content is adjusted to be less than 0.0001%, and therefore 0.0001% is adjusted to be the lower limit value. It is noted that it is preferably 0.0005% or more, and more preferably 0.0010% or more.
    [00109] "Al: 0.001% to 2.00%" [00110] Al is an element that suppresses the generation of iron-based carbide to make it easy to obtain residual austenite, and increasing strength and formability. However, when an Al content exceeds 2.00%, weldability deteriorates, and therefore an upper limit on the Al content is adjusted to be 2.00%. From this point of view, the Al content is preferably 1.50% or less, and more preferably 1.20% or less. On the other hand, the present invention is shown without particularly limiting a lower limit on the content of Al, but Al is the unavoidable impurity minutely existing in a raw material, and the cost of production increases dramatically if the Al content is adjusted to be less than 0.001%, and therefore the lower limit is adjusted to be 0.001% or more. In addition, Al is an effective element also as a deoxidizer, but the amount of Al is preferably 0.010% or
    Petition 870180145531, of 10/29/2018, p. 36/111
    30/82 more, to obtain the deoxidation effect more sufficiently.
    [00111] "N: 0.0001 to 0.0100%" [00112] N forms a coarse nitride, and deteriorates ductility and stretch flangeability, and therefore an amount of addition of this is necessary to be suppressed. When an N content exceeds 0.0100%, the trend becomes obvious, and therefore an upper limit on the N content is adjusted to be 0.0100%. From the point of view of ductility and stretch flangeability, the upper limit of the N content is preferably 0.0070%, and more preferably 0.0050%. In addition, N counts with the occurrence of a spiracle in the welding time, and therefore, the lower the content, the better. The present invention is shown without particularly limiting a lower limit of the N content, but the cost of production increases dramatically if the N content is adjusted to be less than 0.0001%, and therefore the lower limit is adjusted to be 0.0001% or more. In addition, it is preferably 0.0005% or more, and more preferably 0.0010% or more.
    [00113] "O: 0.0001 to 0.0100%" [00114] Oxygen forms an oxide, and deteriorates ductility and stretch flangeability, and therefore an amount of addition of this is required to be suppressed. When an O content exceeds 0.0100%, the deterioration of the stretch flangeability becomes obvious, and therefore an upper limit on the O content is adjusted to be 0.0100% or less. In addition, the O content is preferably 0.0070% or less, and more preferably 0.0050% or less. The present invention is shown without particularly limiting a lower limit of the O content, but the cost of production increases dramatically if the O content is adjusted to be less than 0.0001%, and therefore the lower limit is adjusted to be 0.0001%. In addition, the lower limit of the O content is preferably 0.0003%, and more
    Petition 870180145531, of 10/29/2018, p. 37/111
    31/82 preferably 0.0005%.
    [00115] In addition, it is preferable to add one or two types or more of Ti: 0.001 to 0.150%, Nb: 0.001 to 0.100%, V: 0.001 to 0.300%, in addition to the elements described above to the base steel plate of the present invention.
    [00116] “Ti: 0.001 to 0.150%” [00117] Ti is an element that contributes to the increase in the resistance of the steel plate by reinforcing the precipitate, reinforcing the fine grain by suppressing the growth of ferrite crystal grains, and reinforcement of disagreement by suppressing recrystallization. However, when a Ti content exceeds 0.150%, an amount of carbonitride precipitation increases, and formability deteriorates, and therefore the Ti content is preferably 0.150% or less. The present invention is shown without particularly limiting a lower limit of the Ti content, but the Ti content is preferably 0.001% or more, to fully achieve the effect of increasing strength by adding Ti.
    [00118] “Nb: 0.001 to 0.100%” [00119] Nb is an element that contributes to the increase of resistance of the steel plate by the reinforcement of the precipitate, the reinforcement of the fine grain by suppressing the growth of the ferrite crystal grains, and reinforcing disagreement by suppressing recrystallization. However, when an Nb content exceeds 0.150%, an amount of carbonitride precipitation increases, and formability deteriorates, and therefore the Nb content is preferably 0.150% or less. The present invention is shown without particularly limiting a lower limit of the Nb content, but the Nb content is preferably 0.001% or more, to sufficiently obtain the effect of increasing the strength by adding Nb.
    [00120] "V: 0.001 to 0.300%"
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    32/82 [00121] V is an element that contributes to the increase of the resistance of the steel plate by the reinforcement of the precipitate, the reinforcement of the fine grain by the suppression of the growth of the ferrite crystal grains, and the reinforcement of the discrepancy through the suppression recrystallization. However, when a V content exceeds 0.300%, an amount of carbonitride precipitation increases, and formability deteriorates, and therefore the V content is preferably 0.300% or less. The present invention is shown without particularly limiting a lower limit of the V content, but the V content is preferably 0.001% or more, to sufficiently obtain the effect of increasing strength by adding V.
    [00122] Additionally, it is preferable to add one or two types or more from Mo: 0.01 to 2.00%, W: 0.01 to 2.00%, Cr: 0.01 to 2.00%, Ni: 0.01 to 2.00%, Cu: 0.01 to 2.00%, B: 0.0001 to 0.0100%, in addition to the elements described above in the base steel plate of the present invention. [00123] "Mo: 0.01 to 2.00%" [00124] Mo is an effective element that suppresses a phase transformation at high temperature and high strength. Mo can be added instead of a part of C and / or Mn. When a Mo content exceeds 2.00%, the operability in hot operation is impaired and productivity is lowered, and therefore the Mo content is preferably 2.00% or less. The present invention is shown without particularly limiting a lower limit of the Mo content, but the Mo content is preferably 0.01% or more, to sufficiently achieve high strengthening by the addition of Mo.
    [00125] "W: 0.01 to 2.00%" [00126] W is an effective element that suppresses the phase transformation at high temperature and high strength. W can be added instead of a part of C and / or Mn. When a W content exceeds 2.00%, the operability in hot operation is impaired, and productivity is lowered, and therefore the W content is preferably
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    33/82
    2.00% or less. The present invention is shown without particularly limiting a lower limit on the W content, but the W content is preferably 0.01% or more, to sufficiently achieve high strengthening by adding W.
    [00127] "Cr: 0.01 to 2.00%" [00128] Cr is an effective element that suppresses the phase transformation at high temperature and high strength. Cr can be added instead of a part of C and / or Mn. When a Cr content exceeds 2.00%, hot run operability is impaired, and productivity is lowered, and therefore the Cr content is preferably 2.00% or less. The present invention is shown without particularly limiting a lower limit of the Cr content, but the Cr content is preferably 0.01% or more, to obtain quite the high strength by the addition of Cr.
    [00129] "Ni: 0.01 to 2.00%" [00130] Ni is an effective element that suppresses the phase transformation at high temperature and high strength. Ni can be added instead of a part of C and / or Mn. When a Ni content exceeds 2.00%, the weldability is damaged, and therefore the Ni content is preferably 2.00% or less. The present invention is shown without particularly limiting a lower limit of the Ni content, but the Ni content is preferably 0.01% or more to obtain sufficiently high strength by the addition of Ni.
    [00131] "Cu: 0.01 to 2.00%" [00132] Cu is an element that increases the resistance due to the existence in steel as fine particles, and can be added instead of a part of C and / or Mn. When a Cu content exceeds 2.00%, the weldability is damaged, and therefore the Cu content is preferably 2.00% or less. The present invention is shown without particularly limiting a lower limit of the Cu content, but the Cu content is,
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    34/82 preferably 0.01% or more, to obtain sufficiently high strength by adding Cu.
    [00133] “B: 0.0001 to 0.0100%” [00134] B is an effective element that suppresses the high temperature phase transformation, and the high strengthening, and can be added instead of a part of C and / or Mn. When a B content exceeds 0.0100%, the operability in hot heat is impaired, and productivity is lowered, and therefore the B content is preferably 0.0100% or less. The present invention is shown without particularly limiting a lower limit of the B content, but the B content is preferably 0.0001% or more, to obtain sufficiently high strength by the addition of B.
    [00135] Additionally, it is preferable to add one or two types or more of Ca, Ce, Mg, Zr, La, REM to the base steel plate of the present invention for 0.0001 to 0.0100% as a total in addition to the elements mentioned above.
    [00136] "One or two types or more of Ca, Ce, Mg, Zr, La, REM to 0.0001 at 0.0100% as Total" [00137] Ca, Ce, Mg, Zr, La, REM they are effective elements for improving formability, and one or two types or more can be added. However, when a total content of one type or two or more types of Ca, Ce, Mg, Zr, La, REM exceeds 0.0100%, there is a possibility that the ductility is inversely damaged. Therefore, the total content of each element is preferably 0.0100% or less. The present invention is shown without particularly limiting a lower limit on the total content of one type or two or more types of Ca, Ce, Mg, Zr, La, REM, but the total content of each element is preferably 0.0001% or more, to obtain the effect of improving the formability of the steel plate.
    [00138] Note that REM is an abbreviation for an Earth Metal
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    35/82
    Rare, and indicates an element belonging to a series of lanthanoid. In the present invention, it is often the case that REM and Ce are added as a metal misch, and there is a case where the elements of the lanthanoid series are contained in the complex in addition to La and Ce. The present invention is shown even if the elements of the lanthanoid series other than these La and Ce are contained as the inevitable impurities.
    cHigh-strength hot-dip galvanized steel sheet production method>
    [00139] Next, a method of producing a high-strength hot-dip galvanized steel sheet of the present embodiment is described.
    [00140] The production method of the high-strength hot-dip galvanized steel sheet of the present embodiment includes: a hot-rolling step of heating a plate having the above-mentioned chemical component at 1180 ° C or more, starting a hot rolling carried out by plural passes, and performing hot rolling where a relationship between a temperature "T" of a hot rolled steel sheet, a thickness of the sheet "h", and an elapsed time "t" between each passing within a range of 1050 ° C at a lamination finishing temperature, satisfies the following expression (1), and finishing the lamination at a temperature range of 880 ° C or more; a first cooling step of starting a cooling after a time elapsed after the completion of the hot lamination until the cooling start is set to be 1.0 seconds or more, and cessation of cooling to 450 ° C or more; a cold rolling step of setting the time elapsed after the first cooling down to 400 ° C to be an hour or more, and then performing a cold rolling, while adjusting a total reduction ratio to 30% at 75%; an annealing step
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    36/82 continuous annealing at maximum heating temperature (AC3 - 50) ° C or more; and an immersion coating step of the steel sheet in a galvanizing bath, and the formation of a hot dip galvanized layer on a surface of the steel sheet after the continuous annealing step.
    [00141] Note that in the following expression (1), “N” represents a total number of passes from the start of the hot rolling to completion, “i” represents an order of each pass, “Ti” represents a temperature of lamination (° C) in passage i a , “hi” represents a plate thickness (mm) after processing passage ia, and “ti” represents a time elapsed from passage ia to the next passage. Note that when i = 1, ho = a thickness of the plate. In addition, an elapsed time from one final pass to the next pass is an elapsed time from the final pass to the start of cooling time after the hot rolling is completed.
    [00142] Here, expression (1) is an empirical formula taking into account a progress of recrystallization of austenite in the hot rolling stage and a growth of recrystallized austenite, and is an index that represents a size of a crystal grain of austenite after lamination. A product of a polynomial of the rolling temperature “T” and the reduction ratio represents a driving force for recrystallization. An exponential term represents the tendency for atom dispersion, and is related to a growth rate of recrystallized austenite grains. The time “t” is added to the product of both, and thus a degree of austenite growth for each pass can be assessed, and an assessment of a austenite grain diameter by multi-pass hot rolling. can be done by finding a medium square root and a square root of it.
    Petition 870180145531, of 10/29/2018, p. 43/111
    37/82 [00143] Hereinafter, the reasons for limiting the conditions mentioned above are described.
    [Numerical Expression 3]
    [00144] To produce the high-strength hot-dip galvanized steel sheet of the present embodiment, first, a plate having the chemical component described above (composition) is melted.
    [00145] A plate produced by a continuously molten plate, a thin plate melter, and so on, can be used as a plate supplied for hot rolling. The production method of the high-strength steel sheet of the present invention conforms to a process, such as direct continuous casting (CC-DR) which performs hot rolling immediately after casting.
    (Hot rolling step) [00146] In the hot rolling step, a plate heating temperature is set to be 1180 ° C or more. When the heating temperature of the plate is excessively low, there is a possibility that the crystal-oriented anisotropy of a plate structure is generated as a result of casting. In addition, when the plate heating temperature is low, a finishing laminating temperature is below a transformation point Ar3 to be a two-phase region laminating of ferrite and austenite, a hot-rolled plate structure becomes if a heterogeneous mixed grain structure, the heterogeneous structure is not settled
    Petition 870180145531, of 10/29/2018, p. 44/111
    38/82 even through passing through cold rolling, and annealing steps, and ductility and curvature deteriorate. In addition, lowering the finish rolling temperature incurs an excessive increase in rolling load, and there are possibilities in which rolling becomes difficult, and a defective shape of the steel sheet after rolling is incurred, and therefore the heating temperature of the plate is preferably 1200 ° C or more. On the other hand, an upper limit on the plate heating temperature is not particularly limited, but it is necessary to admit a large amount of energy to heat the plate above 1300 ° C, and therefore the plate heating temperature is preferably , 1300 ° C or less.
    [00147] Note that the transformation point temperature Ar3 is calculated by the following expression.
    Ar3 = 901 - 325 x C + 33 x Si - 92 x (Mn + Ni / 2 + Cr / 2 + Cu / 2 + Mo / 2) + 52 x Al [00148] In the above expression, C, Si, Mn, Ni, Cr, Cu, Mo, Al represents contents [mass%] of each element.
    [00149] The plate is heated to the heating temperature of the plate, and then hot rolling is carried out to make it the hot-rolled steel plate. When hot rolling is performed, the austenite texture becomes strong, and its anisotropy also becomes large if excessive reduction of the rolling is applied at high temperature. In order to avoid this, hot rolling is carried out under the condition that satisfies the aforementioned expression (1) composed of the temperature of the hot rolled steel sheet, the thickness of the sheet, and the time elapsed between each pass during a period of 1100 ° C for finalizing hot rolling.
    [00150] The expression mentioned above (1) is also an expression that evaluates a degree of development of the austenite texture, and when a value of the expression mentioned above (1) is below 0.10, the texture of
    Petition 870180145531, of 10/29/2018, p. 45/111
    39/82 austenite of the hot-rolled steel sheet becomes strong, and therefore the value of the aforementioned expression (1) is adjusted to be 0.10 or more. The value of the aforementioned expression (1) is preferably 0.20 or more, and more preferably 0.30 or more, to further weaken the texture and randomize the austenite crystal orientation.
    [00151] On the other hand, when the value of the expression mentioned above (1) is above 1.00, the recrystallization of austenite excessively proceeds, the structure becomes coarse, and therefore the value of the expression mentioned above (1 ) is preferably 1.00 or less, and more preferably 0.90 or less.
    [00152] In addition, in the hot rolling stage, the finishing laminating temperature of the hot rolling mill, namely, the finishing temperature of the hot rolling mill is adjusted to be 880 ° C or more.
    [00153] When the hot rolling finish temperature is less than 800 ° C, the development of the austenite texture is accelerated, the crystal orientation is strongly deflected, and there is a possibility that the crystal orientation of the residual austenite after cold rolling and annealing is also deflected. Consequently, it is important to perform high temperature lamination as much as possible in hot lamination so as not to develop the texture of residual austenite.
    [00154] On the other hand, an upper limit on the finishing temperature of the hot rolling mill is not particularly provided, but when the finishing temperature is adjusted to an excessively high temperature range, such as exceeding 1000 ° C, it is necessary to extract the board at a very high temperature to ensure the temperature, and therefore is not preferable at the cost stage. Consequently, the completion temperature is preferably 1000 ° C or less.
    Petition 870180145531, of 10/29/2018, p. 46/111
    40/82 (First cooling step) [00155] After the hot rolling is finished, the hot rolled steel sheet obtained is quickly cooled to make it a coil to be a hot rolled coil, but it is necessary to properly control the following: a time elapsed before rapid cooling begins; and conditions of rapid cooling, because these conditions affect the anisotropy of the hot rolled steel sheet. In the present embodiment, the time that elapses after the hot rolling is completed before the rapid cooling starts is set to be 1.0 seconds or more, then the rapid cooling starts, and the cooling stops at 450 ° C or more. The limiting reasons for these are as follows.
    [00156] After hot rolling, the texture of austenite in the hot rolled steel sheet has a strong anisotropy resulting from the lamination processing. To reduce anisotropy, it is necessary to advance the recrystallization of austenite for a period after the hot lamination is finished until the subsequent rapid cooling starts. From this point of view, the time elapsed after hot rolling is completed until the rapid cooling is started is set to be 1.0 seconds or more. To further advance austenite recrystallization, the elapsed time is preferably 1.5 seconds or more, and more preferably 2.0 seconds or more. An upper time limit is not particularly provided, but to start rapid cooling after a long time over 20 seconds has elapsed, enough space to retain the steel sheet after hot rolling is required, and facilities are required to be drastically increased in size. Therefore, it is not preferable in the cost phase, so that the time is preferably 20 seconds or less, and more preferably 15 seconds or less, from a
    Petition 870180145531, of 10/29/2018, p. 47/111
    41/82 view of the cost phase.
    [00157] In addition, an average cooling rate of rapid cooling after hot rolling until it is wound as a coil is preferably 10 ° C / second or more and 60 ° C / second or less. When the average cooling rate is 10 ° C / second or less, the ferrite and pearlite form a microstructure that stretches in the form of a band in a rolling direction, additionally concentrates of Mn in the pearlite to form a region of Mn concentrate in the form of a band. The residual austenite obtained by the annealing step is affected by the concentrated region of Mn, easy to remain in a form extending in the lamination direction, and is not preferable because there is a possibility that the temperability anisotropy occurs. On the other hand, when the average cooling rate exceeds 60 ° C / second, the transformation from austenite does not proceed during cooling, and becomes a low temperature transformation structure after cooling. The low temperature transformation structure strongly reflects the texture of austenite, and is therefore not preferable.
    [00158] In addition, a cooling stop temperature in the rapid cooling affects the transformation of the structure during a winding step of the hot-rolled steel sheet inside the coil. Namely, in the winding step, hot-rolled steel sheet such as coil, pearlite and / or coarse cementite, whose major axis exceeds 1 mm is (are) generated in the hot-rolled steel sheet, and in this way, the stresses that are introduced according to the cold rolling are dispersed non-uniformly. As a result, austenites having various crystal orientations are generated by a reverse transformation in the annealing step, and the texture of the residual austenite becomes random. Namely, the anisotropy of residual austenite is weakened, and it is possible to improve the isotropy of
    Petition 870180145531, of 10/29/2018, p. 48/111
    42/82 martensite obtained by the transformation of residual austenite. From this point of view, the stop temperature for fast winding after hot rolling is adjusted to be 500 ° C or more, to generate pearlite and / or coarse cementite, and to obtain the isotropy of the residual austenite. The cooling stop temperature is preferably 530 ° C or more, and more preferably 550 ° C or more, to reduce anisotropy. On the other hand, when the cooling stop temperature is set too high, a scale layer on the surface layer of the steel plate becomes excessively thick, and a degree of surface is damaged. Therefore, it is necessary to adjust the cooling stop temperature to 650 ° C or less. From this point of view, the cooling stop temperature is preferably 630 ° C or less.
    (Second Cooling Stage) [00159] Then, in a stage in which the steel sheet rapidly cooled, as mentioned above, is continuously wound like the coil, a time elapsed from the stop of the rapid cooling to 400 ° C is adjusted to be 1.0 hour or more. Namely, it is necessary to retain the steel sheet for a sufficient period of time at a temperature range in which cementite is generated after the rapid cooling stops to sufficiently generate pearlite and / or coarse cementite to reduce the anisotropy of temperability during this elapsed time. Therefore, slow cooling is performed so that the time elapsed from the stopping of the rapid cooling to 400 ° C becomes an hour or more.
    [00160] The elapsed time is preferably 2.0 hours or more, and more preferably 3.0 hours or more. An upper limit on elapsed time is not particularly provided, but a special facility is required to retain the steel sheet for more than 24.0 hours, and is not preferable in the cost phase, so the upper limit is,
    Petition 870180145531, of 10/29/2018, p. 49/111
    43/82 preferably 24.0 hours or less.
    [00161] Note that a hot rolled steel plate retention step during this elapsed time is usually superimposed with the winding step, but it goes without saying that the elapsed period can include up to a coil retention period after coiling. Additionally, slow cooling in the second cooling step is part of a period within the elapsed period, and it goes without saying that a case when the steel sheet is retained at a constant temperature is included.
    (Cold rolling stage) [00162] Cold rolling is then performed for the steel sheet wound as the hot rolled coil, as mentioned above. [00163] Cold rolling is performed such that a total reduction ratio is 30% or more, and 75% or less. Cold rolling is preferably performed by plural passes, and the number of rolling passes and allocation of the reduction ratio for each pass are not objective. When the total reduction ratio of cold rolling is below 30%, enough stress is not accumulated on the steel plate, and in the subsequent annealing step, the crystal orientation of the austenite generated by the reverse transformation does not become sufficiently random to generate anisotropy, and the temperability anisotropy is generated. In order to accumulate enough tension, the ratio of total reduction in cold rolling is preferably 33% or more, and more preferably 36% or more. On the other hand, when the total reduction ratio exceeds 75%, the steel sheet is at high risk of fracture during cold rolling, and therefore the total reduction ratio is adjusted to be 75% or less. From this point of view, the total reduction ratio is preferably 70% or less, and more preferably 65% or less.
    (Continuous annealing step)
    Petition 870180145531, of 10/29/2018, p. 50/111
    44/82 [00164] Then, the annealing process is carried out for the cold rolled steel sheet obtained as mentioned above. It is desirable to incorporate the hot dip galvanized process (in addition, the alloy treatment of the coating layer, depending on the circumstances) to the surface of the steel sheet in the cooling process after reaching the maximum heating temperature during the heating step. annealing. Namely, as a facility for carrying out the annealing step, it is preferable to use a continuous annealing coating line having a preheating zone, a reduction zone, and a coating zone. Note that an atmosphere in the preheating zone can be any one of an oxidation atmosphere, a non-oxidation atmosphere, and a direct reduction atmosphere.
    [00165] Hereinafter, the step is described as a continuous process in which a step related to the coating is incorporated into the cooling step after annealing by using the continuous annealing coating line, as mentioned above.
    [00166] In the annealing step, it is preferable to increase the temperature such that an average heating rate within a range of 600 to 750 ° C becomes 20 ° C / sec or less, heating is carried out such that the temperature of maximum heating becomes (Ac3 - 50) ° C or more, and cooling is performed such that the average cooling rate within a range of 740 to 500 ° C becomes 1.0 ° C / second or more.
    [00167] Here, in the continuous annealing coating line, the heating step, including raising the temperature to 20 ° C / sec or less, within the range of 600 to 750 ° C, is carried out in the preheating zone, subsequently the maximum annealing heating temperature is reached in the reduction zone, and additionally, cooling within the range of 740 to 500 ° C is
    Petition 870180145531, of 10/29/2018, p. 51/111
    45/82 performed at 1.0 ° C / sec or more, during the cooling process until reaching the coating zone.
    [00168] These annealing conditions are described below. [00169] The rate of heating in the annealing step affects a recrystallization behavior on the steel sheet. In particular, the heating rate at 600 to 750 ° C greatly affects the isotropy of the structure. Consequently, within this temperature range, it is preferable to adjust the average heating rate particularly at 600 to 750 ° C to be 20 ° C / second or less, because recrystallization is quite advanced to produce the structure before uniform and isotropic reverse transformation. , and, thus, the austenite generated from this by reverse transformation, has a fine and isotropic pattern.
    [00170] Here, the heating process in the annealing step is carried out in the preheating zone on the continuous annealing coating line, but it is desirable that at least part of the preheating zone is an oxidation process zone in the oxidation atmosphere , and an oxidation process to form a Fe oxide coating film having an appropriate thickness in the surface layer of the steel sheet is carried out in the oxidation process zone. Namely, it is desirable to form the Fe oxide coating film having the appropriate thickness in the oxidation process zone being at least part of the preheat zone as a one stage pre-process which forms a decarbonized layer in the surface layer. of the steel sheet by heating in the subsequent reduction zone. In this case, it is desirable that the temperature of the steel plate when it passes through the oxidation process zone be adjusted to 400 to 800 ° C, and an air ratio being a ratio between “a volume of air contained in the gas mixed in a unit volume ”, and“ a volume of air theoretically required to enable complete combustion of combustible gas contained in the gas
    Petition 870180145531, of 10/29/2018, p. 11/11
    46/82 mixed in a unit volume ”, is adjusted to 0.7 to 1.2 in the mixed air gas and the fuel gas used for a preheat burner when heating is carried out in the oxidation process zone in the preheat zone to thereby form the 0.01 to 20 mm Fe oxide coating film on the surface layer of the steel sheet.
    [00181] When the air ratio exceeds 1.2, the oxide coating film grows excessively, and there are possibilities that the decarbonized layer formed in the surface layer portion of the steel sheet grows excessively in the subsequent reduction zone, and where the oxide coating film cannot be fully reduced in the reduction zone, the oxide coating film remains on the surface layer of the steel sheet, and the platability is lowered. On the other hand, when the air ratio is less than 0.7, the oxide coating film is not completely generated. In addition, the oxide coating film generated in the oxidation process zone in the preheat zone acts as a source of energy supply for the oxide containing Si and / or Mn in the decarbonized layer formed in the subsequent reduction zone, but if the film of oxide coating is not completely generated, there is a possibility that the decarbonized layer where the high density and fine oxides are dispersed, as described above, cannot be obtained.
    [00182] Furthermore, when the temperature of the steel sheet when it passes through the oxidation process zone in the preheat zone is less than 400 ° C, it is impossible to form the sufficient oxide coating film; on the other hand, the oxide coating film excessively grows at high temperature above 800 ° C, and therefore it becomes difficult to adjust the thickness of the decarbonized layer within a predetermined range.
    Petition 870180145531, of 10/29/2018, p. 53/111
    47/82 [00183] When the maximum heating temperature in the annealing stage is low, the reverse transformation to austenite does not proceed sufficiently, and a fraction of the ferrite becomes excessively large. In addition, the maximum heating temperature is adjusted to (Ac3 - 50) ° C or more, to ensure a sufficient hard structural fraction, and it is preferably (Ac3 - 35) ° C or more. An upper limit of the maximum heating temperature is not particularly provided, but when it is heated above 1000 ° C, the surface quality of the steel sheet is drastically damaged, the wettability of the coating is deteriorated, and therefore the temperature of maximum heating is preferably 1000 ° C or less, and more preferably 950 ° C or less.
    [00184] In addition, it is desirable to reach the maximum heating temperature in the annealing step in the reduction zone in the continuous annealing coating line. In the reduction zone, it is possible to form the decarbonized layer by reducing the Fe oxide coating film generated in the oxidation process zone in the preheating zone, and to disperse the oxides sparingly containing Si and / or Mn in the decarbonized layer. Here, the atmosphere of the reduction zone is desirable to be able to be an atmosphere in which a ratio (P (H2O) / P (H2)) between a partial pressure of water vapor P (H2O) and a partial pressure of hydrogen P (H2) is within a range of 0.0001 to 2.00. When (P (H2O) / P (H2)) is less than 0.0001, the oxides containing Si and / or Mn are formed only in one layer of the uppermost surface, and it is difficult to dispense moderately the oxides containing Si and / or Mn within the decarbonized layer. On the other hand, when (P (H2O) / P (H2)) exceeds 2.00, decarburization proceeds excessively, and there is a possibility that the thickness of the decarbonized layer cannot be controlled within a predetermined range. Note that (P (H2O) / P (H2)) is preferably within a range of 0.001 to 1.50, and,
    Petition 870180145531, of 10/29/2018, p. 54/111
    48/82 more preferably, within a range of 0.002 to 1.20.
    [00185] In the cooling process from the maximum heating temperature in the annealing step, the cooling is carried out such that the average cooling rate within a range of 740 ° C to 500 ° C in the cooling process is 1.0 ° C / second or more, to suppress ferrite transformation, and to make the transformation temperature as low as possible to produce an effective fine grain diameter of crystal. Namely, 740 ° C to 500 ° C is a temperature range where the ferrite is generated, and it is possible to suppress the transformation of ferrite by adjusting the average cooling rate within the temperature range to 1.0 ° C / second or more. From this point of view, the average cooling rate in the cooling process from the maximum heating temperature is preferably 2.5 ° C / second or more, and more preferably 4.0 ° C / second or more. An upper limit on the cooling rate is not particularly provided, but a special cooling facility and a refrigerant that interferes with the coating step are required to obtain an excessively large average cooling rate, and therefore is not preferable. From this point of view, the average cooling rate is preferably 150 ° C / second or less, and more preferably 100 ° C / second or less.
    (Coating step) [00186] Subsequently, the steel sheet is immersed in a hot-dip galvanizing bath in the coating zone to perform hot-dip galvanizing. As a coating bath composition, it is preferable that zinc is a major constituent, an effective amount of Al being a value in which a total amount of Fe is subtracted from a total amount of Al in the bath is within a range of 0, 01 to 0.18 weight%. Particularly, when an alloy treatment is carried out after coating, the effective amount
    Petition 870180145531, of 10/29/2018, p. 55/111
    49/82 Al in the bath is preferably within a range of 0.07 to 0.12 weight% to control the progress of the coating layer alloy. [00187] On the other hand, when the coating layer is not to be bonded, there is no problem if the effective amount of Al in the bath is within a range of 0.18 to 0.30 weight%. When the amount of Al is large, an Al alloy is generated first between a base iron / coating layer before the alloy, and it functions as a barrier; therefore, the league does not proceed. Consequently, the amount of Al is to be suppressed when the alloy is made. On the other hand, when the amount of Al is much more suppressed, the alloy proceeds excessively, and, from this point of view, Al is necessary to be added, so that the amount of Al is determined by a relationship of both equilibrium . On the other hand, when the alloy is not made, there is no big problem if the barrier layer is generated, and therefore, there is no practical problem if the amount of Al becomes large.
    [00189] Furthermore, the effect of the present invention is not impaired if one type or two types or more among Pb, Sb, Si, Sn, Mg, Mn, Ni, Cr, Co, Ca, Cu, Li, Ti, Be, Bi, Sr, I, Cs, Sr, REM are (are) mixed (s) inside the galvanizing bath, and there is a case when it is preferable, such that corrosion resistance and operability are improved depending on their quantity.
    [00190] A temperature of the coating bath is preferably 450 ° C to 470 ° C. When the coating bath temperature is less than 450 ° C, the viscosity of the coating bath increases excessively, so it becomes difficult to control a thickness of the coating layer, and an external appearance of the steel sheet is damaged. On the other hand, when the coating bath temperature exceeds 470 ° C, a batch of smoke is generated, and production becomes difficult to safely carry out. Therefore, the
    Petition 870180145531, of 10/29/2018, p. 56/111
    50/82 coating bath temperature is preferably 470 ° C, or less.
    [00191] Furthermore, when the temperature of the steel plate at the moment when the steel plate enters the coating bath is below 430 ° C, it is practically not suitable because it is necessary to give the coating bath a lot of quantity of heat to stabilize the coating bath temperature at 450 ° C or more. On the other hand, when the temperature of the steel sheet at the time when the steel sheet enters the coating bath is above 490 ° C, an facility to remove a batch of heat from the coating bath becomes necessary to stabilize the coating bath temperature at 470 ° C, or less, and is not appropriate from a production cost point of view. Consequently, the inlet temperature of the steel sheet into the coating bath is preferably 430 ° C to 490 ° C to stabilize the temperature of the coating bath.
    [00192] Additionally, to advance the transformation of bainite, and to ensure enough residual austenite, the steel sheet is retained for 20 seconds to 1000 seconds, including the time to immerse in the coating bath at a temperature within a range of 300 to 470 ° C before or after immersion in the coating bath, and in this way it is possible to control the volume fraction of the residual austenite. In this case, when the retention time is less than 20 seconds, the transformation of bainite does not proceed enough, and the carbon concentration for the residual austenite becomes insufficient. The retention time is preferably 35 seconds or more, and more preferably 50 seconds or more, to further increase the hardenability. On the other hand, when the retention time exceeds 1000 seconds, predetermined properties cannot be obtained because the carbon is excessively concentrated in the residual austenite,
    Petition 870180145531, of 10/29/2018, p. 57/111
    51/82 or cementite generation begins. The retention time is preferably 600 seconds or less, and more preferably 450 seconds or less, to limit the carbon concentration in the residual austenite, and to obtain high temperability.
    [00193] In addition, when the alloy treatment is carried out after coating, the bainite transformation process can be carried out either before or after the alloy treatment.
    [00194] After immersion in the coating bath, the alloy treatment of the coating layer can be carried out. An alloy treatment temperature is preferably 470 ° C or more, because when it is less than 470 ° C, the alloy does not proceed sufficiently. In addition, when the alloy treatment temperature exceeds 620 ° C, coarse cementite is generated to drastically lower the strength, and therefore it is preferably 620 ° C or less. The alloy treatment temperature is preferably 480 to 600 ° C, and more preferably 490 to 580 ° C.
    [00195] An alloy treatment time is preferably two seconds or more, and more preferably five seconds or more, in order to proceed with the alloy. On the other hand, when the alloy treatment time exceeds 200 seconds, the coating layer is excessively bonded, and there is a possibility that the properties deteriorate, and therefore the alloy treatment time is preferably 200 seconds. or less, and more preferably, 100 seconds or less.
    [00196] It is noted that the alloy treatment is preferably carried out immediately after immersion in the coating bath, but the temperature of the steel plate can be lowered once to 150 ° C or less, after immersion, and, then reheated to the alloy treatment temperature.
    [00197] In the cooling process after galvanizing of
    Petition 870180145531, of 10/29/2018, p. 11/111
    52/82 hot dip (after alloy treatment when alloy treatment is carried out immediately after hot dip galvanizing), when the average cooling rate for cooling to a temperature range of 150 ° C or less is below 0.5 ° C / second, coarse cementite is generated, and there is a possibility that strength and / or ductility deteriorate, and therefore the average cooling rate is preferably 0.5 ° C / second or more, and more preferably, 1.0 ° C / second or more.
    [00198] In addition, a reheating process can be carried out with the help of martensite tempering during cooling, or after cooling after hot dip galvanizing (after the alloy treatment when the alloy treatment is carried out immediately after hot dip galvanizing). The heating temperature when reheating is carried out is preferably 200 ° C or more, because the tempering does not proceed sufficiently if it is less than 200 ° C. In addition, when the heating temperature exceeds 620 ° C, the resistance extremely deteriorates, and therefore it is preferably 620 ° C or less, and more preferably 550 ° C or less.
    [00199] Additionally, it is preferable to carry out a tempering lamination in which a lamination is carried out in the cold state for the steel sheet cooled to room temperature after the coating step to increase an average discrepancy density. Also, in this tempering lamination, the reduction ratio is preferably 5.00% or less. It is noted that a lower limit of the reduction ratio is not particularly defined, but it is preferably 0.05% or more, and more preferably 0.10% or more.
    [00200] In this case, a degree of reduction ratio of the tempering lamination in which a tension-induced martensite is practically not
    Petition 870180145531, of 10/29/2018, p. 59/111
    53/82 generated, and transition is generated in the ferrite is preferably 1% or less, and, more preferably, 0.50%. It is possible to introduce a tension of approximately 1.0 x 10 13 / m 2 into a total area of the steel sheet without generating the stress-induced transformation of the largest part of the residual austenite by this tempering lamination.
    [00201] Furthermore, a coating film composed of a composite oxide containing phosphorus and / or phosphorus oxide can be formed by carrying out a phosphoric acid-based coating film formation process for the dip galvanized steel sheet obtained by the method mentioned above. The coating film composed of the composite oxide containing phosphorus and / or phosphorus oxide can be made to function as a lubricant when the steel plate is processed, and it is possible to protect the coating layer formed on the surface of the base steel plate.
    [00202] Hereinafter, the present invention is concretely described by the examples. Incidentally, the following examples are to be considered to illustrate concrete effects of the present invention, and without saying that the conditions described in the examples are not to limit the technical scope of the present invention.
    EXAMPLES [00203] Hereinafter, the effects of the present invention are described by the examples, but the present invention is not limited to the conditions used in the following examples.
    [00204] The plates having the chemical components (composition) from A to AG illustrated in Tables 1 to 3 are melted, they are hot-rolled with conditions (the heating temperature of the plate, the expression mentioned above (1), the temperature hot rolling finish) of the hot rolling step illustrated in Tables 4 to 7 immediately after casting, they are cooled while using the conditions (the time elapsed before the rapid cooling starts, the rate
    Petition 870180145531, of 10/29/2018, p. 60/111
    54/82 medium cooling of the rapid cooling, the stopping temperature of the rapid cooling) of the rapid cooling (first cooling step) after the hot rolling is completed until the time when the steel sheet is wound as a coil according to conditions illustrated in Tables 4 to 7, and then, in the subsequent winding step as a coil, the process is carried out while adjusting the elapsed time required for cooling (second cooling) from the end of the rapid cooling to 400 ° C under the conditions illustrated in Tables 4 to 7. After the steel sheet is wound like the coil, the cold rolling step is performed with each of the reduction ratios illustrated in Tables 4 to 7.
    Petition 870180145531, of 10/29/2018, p. 61/111
    55/82 [Table 1]
    With-Chemical PORer.te Ç Si Mn P s Al N OPASTA(%) MASSAfW MASSAÍW PASTA (fc) MASSAÍM MASSAÍW massíM MASSAÍW THE 0.165 1.06 230 0.0051 0.0020 0.042 0.0016 0.0016 Example Θ 0.095 1.39 252 0.011Ü 0.0010 0.035 00021 0.0016 Example Ç 0.233 0.72 1.70 0.0137 0 0031 0.062 0.0D31 0.0009 Example D 0.171 0.50 2.00 0.0131 0.0005 0.204 0.0047 0.0012 Example AND Q.207 0.23 2.52 0.0157 0.0045 0.949 0.0014 0.0005 Example F 0.225 1.23 1.5! 0.0143 0.0002 0.065 0.0023 OJ0020 Example G 0.215 1.01 2.73 0.0077 0.0030 0.054 0.0009 0.0014 Example H 0.123 1.95 1.26 0.0096 0.0050 0.072 0.0043 0.0024 Example [ 0.166 0.36 2.36 0.0137 0.0011 0.960 Q.0D47 0.0002 Example J 0.236 0.39 2.12 0.0139 0.0036 0.037 0.0046 0.0017 Example K 0.103 0.04 1.60 0.0051 0.0025 0.060 0.0018 0.0015 Example L 0.330 0.56 2.20 0.0159 0.0034 0.692 0.0027 0.0025 Example M 0.167 1.39 0.92 0.0094 0.0027 0.073 0.0016 0.0014 Example N 0.007 1.70 2.21 0.0060 0.0042 0.056 0.0026 0.0017 Exempk O 0.224 1.21 2 66 0.0032 0.0050 0 063 0 0036 0.0008 Example P 0.165 0.32 1.94 0.0003 0.0020 0.Q51 0.0023 0.0017 Example Q 0.244 0.09 2.44 0.0190 0.0026 1,261 0.0039 0.0018 Example R 0.170 1.51 1.12 0J0140 0.0019 0.067 0.0036 0.0011 Example s 0.126 0.80 297 0.0075 0.0047 0.061 0 0018 0.0006 Example T 0.165 0.4Θ 2.51 0.0132 0.0009 0.325 0.0049 ΟΌ013 Example u 0.195 1.17 1.99 0.0093 0.0051 0 029 0.0027 0.0012 Exet Triple V 0.207 0.96 1.66 0.0149 0.0020 0.046 0.0046 0.0021 Exempb w 0.153 0.19 2.15 0.0006 0.0012 Q.749 0.0016 0.0024 Example X 0.T63 0.33 I 44 0.0100 0.0067 0.461 0.0021 0.0024 Example y 0.104 1.73 t.90 0.0099 0.0034 0.017 0.0059 0.0010 Exempb z 0.274 0.57 235 0.0147 0.0026 0123 0.0053 0.0016 Example AA 0.121 0.94 3.04 0.0074 0.0015 0.046 0.OD30 0.0013 Example AT 0.163 1.14 1.70 0.0051 0.0043 0.054 0.0036 0.0017 Example B.C 0.252 0.72 285 0.0140 0.0044 0.069 0.0027 0.0009 Example Aü 0.197 1.37 1.87 0.0094 0.0014 0.052 0.0039 0.0013 Example AE 0.069 1.23 2.30 0.0116 0.0046 0.026 0.0026 0/0014 Ex. Crown f ^ ko AF 0.421 1.17 2.31 0.0050 0.4600 0.030 0.0030 0.0022 Ex Coroarafluo AG 0.149 1.16 JL32 0.0090 0.0053 0.020 0.0030 0.0011 Ex. R ^ ko crown AH 0 164 2 70 2.31 0.015 Ü.OO24 0.11 1 0.0032 0.0003 Ex Coroaraíko THERE 0.167 OJM 2.35 0.014 0.0015 0.013 0.0026 0.0017 Ex Raíko Crown AJ 0.154 0.940.012 0.0025 0.087 0 0039 0.0016 Ex. Coroaras ko AK 0.152 0.34 2.34 0.016 0.0009 2.43 0.0048 0.0013 Ex ocrroaraÈVj
    Petition 870180145531, of 10/29/2018, p. 62/111
    56/82 [Table 2]
    ComponentChemical You Nb V Cr Ni Ass Mo BPASTA (%) PASTA (%) PASTA(%) PASTA(%) PASTA(%) PASTA(%) PASTA(%) PASTA (%) THE Example B Example Ç Example D Example AND Example F 0.17 Example G0.029 Example H 1.04 Example I 0.79 Example J 0.109Example K 0.0015 Example L0.14 Example M 0.81 0.05Example N Example O Example P Example Q 0.09 0.0009 Example R 0.003 0.0160.0030 Example s 0.030 Example T 0.49 0.21 Example u Example V 0.051 0.0042 Example w Example X 1.04 047 Example Y Example z 0.23Example AA Example AB Example B.C 0.079 0.007 Example AD Example AE Comparative Example AF Comparative Example AG Comparative Example AH Comparative Example THERE Comparative Example AJ Comparative Example AK Comparative Example
    Petition 870180145531, of 10/29/2018, p. 63/111
    57/82 [Table 3]
    ComponentChemical W Here Ce Mg Zr There REMPASTA (%) PASTA (%) PASTA (%) PASTA (%) PASTA (%) PASTA (%) PASTA (%) THE Example B Example Ç Example D Example AND Example F0.0028Example G Example H Example I Example J Example K Example L Example M Example N0.0008 0.0010 Example O 0.41 Example P 0.0035 Example Q Example R 0.0017 Example s Example T Example u 0.0015 Example V Example w0.0028Example X Example Y 0.0036 Example z Example AA 0.0028 Example AB0.0049Example B.C Example AD Example AE Comparative Example AF Comparative Example AG Comparative Example AH Comparative Example THERE Comparative Example AJ Comparative Example AK Comparative Example
    Petition 870180145531, of 10/29/2018, p. 64/111
    58/82 [Table 4]
    E E X X E P Μ E P RL 1 0 ME NOKL C Q 0 U M íP M 0 IN C E 0NTAND HOT LAMINATION FIRST COOLING SECOND COOLING LAMI STEP-COLD NATION NOTE TEMPERATUREHEATINGPLATE E X P R E S S1 TEMPERATURECOMPLETE-TION OFBLADE-DOG TIME THROUGH THE BEGINNING OF THE COOLING AVERAGE COOLING RATE COOLING TEMPERATURE Elapsed time up to 400 ° C REDUCTION REASON ° c ° c SECOND ° C / SECOND ° c TIME % 1 THE 1215 0.40 966 3.8 30.0 571 3.3 40 Example 2 THE 1240 0.57 952 3.2 34.8 605 3.9 56 Example 3 THE 1230 0.68 884 4.1 25.5 573 2.1 42 Example 4 THE 1260 0.43 929 4.0 28.7 584 5.2 53 Example 5 B 1240 0.46 890 4.0 26.5 582 2.4 60 Example 6 B 1205 0.18 978 1.8 37.7 575 3.0 65 Example 7 B 1265 0.61 953 2.4 51.4 553 3.8 50 Example 8 B 1245 0.69 887 3.2 27.5 602 3.3 65 Example 9 Ç 1280 0.51 909 1.4 25.9 611 3.8 50 Example 10 Ç 1200 0.58 948 1.5 35.1 616 2.7 59 Example 11 Ç 1215 0.79 934 3.5 37.8 566 3.4 63 Example 12 Ç 1220 0.31 950 2.7 45.2 597 5.2 71 Example 13 D 1270 0.65 949 2.9 29.0 565 2.7 59 Example 14 D 1215 0.40 915 1.6 31.0 634 4.6 50 Example 15 D 1210 0.84 899 8.5 28.2 582 2.9 58 Example 16 D 1030 0.02 750 2.4 12.5 577 2.5 58 Comparative Example17 AND 1255 0.72 952 2.3 31.5 547 4.0 45 Example 18 AND 1210 0.45 945 4.4 27.4 568 2.0 72 Example 19 AND 1245 0.62 915 3.4 24.6 604 2.9 40 Example 20 AND 1210 0.07 957 2.7 28.6 578 2.2 63 Comparative Example 21 F 1260 0.31 920 2.7 26.6 599 3.4 58 Example 22 F 1260 0.62 988 3.9 47.5 595 2.6 35 Example 23 F 1245 0.69 912 2.4 26.5 602 4.1 34 Example 24 F 1265 0.02 927 3.6 46.8 560 2.4 48 Comparative Example25 G 1235 0.25 934 2.3 31.8 602 3.9 50 Example 26 G 1205 0.40 913 3.5 46.0 524 2.5 48 Example 27 G 1240 0.60 941 3.2 29.6 587 3.3 64 Example 28 G 1260 0.18 840 2.2 44.6 551 3.6 66 Comparative Example 29 H 1275 0.54 882 2.9 41.3 569 2.7 56 Example 30 H 1205 0.23 917 4.7 35.8 614 3.7 56 Example
    Petition 870180145531, of 10/29/2018, p. 65/111
    59/82 [Table 5]
    E E X X E P Μ EQ RL 1 O ME N T AL C Q O U M íP M O I N C E O NT E HOT LAMINATION FIRST COOLING SECOND COOLING STEP OFLAMINATIONCOLD NOTE PLATE HEATING TEMPERATURE E X P R E S S1 TEMPERATU -RACOMPLETIONINLAMINATION TIME THROUGH STARTING COOLING RATE OFCOOLINGAVERAGE COOLING TEMPERATURE Elapsed time up to 400 ° C REDUCTION REASON ° c ° c SECOND ° C / SECOND ° c TIME % 31 H 1220 0.19 935 4.7 16.1 611 3.8 53 Example 32 H 1230 0.37 949 (L2 26.1 615 4.7 60 Comparative Example 33 I 1205 0.91 933 3.9 41.8 566 3.4 38 Example 34 I 1225 0.67 913 7.4 31.7 574 2.5 53 Example 35 I 1230 0.41 894 3.7 21.0 609 3.3 64 Example 36 I 1250 0.21 901 2.5 33.9 428 5.0 30 Comparative Example 37 J 1240 0.52 920 1.1 30.5 549 5.0 50 Example 38 J 1275 0.83 946 2.8 33.9 582 2.3 38 Example 39 J 1235 0.27 886 3.2 21.6 588 1.6 66 Example 40 J 1235 0.54 956 1.2 44.1 543 0Ό 60 Comparative Example 41 K 1200 0.25 895 3.0 29.8 561 2.3 45 Example 42 K 1240 0.62 953 3.3 35.8 589 3.5 59 Example 43 K 1200 0.31 953 3.1 44.0 583 2.8 43 Example 44 K 1210 0.54 916 3.1 26.0 613 3.8 15 Comparative Example 45 L 1200 0.58 955 4.2 41.9 621 1.8 41 Example 46 L 1225 0.60 940 3.7 28.9 584 2.9 55 Example 47 L 1260 0.51 964 3.1 30.8 590 3.9 47 Example 48 L 1205 0.20 956 3.3 43.4 577 2.2 88 Comparative Example 49 M 1200 0.67 907 3.7 31.7 567 3.8 44 Example 50 M 1260 0.38 913 4.4 28.8 587 1.5 40 Example 51 M 1240 0.60 930 4.8 35.7 613 2.5 56 Example 52 M 1260 0.34 937 3.2 37.3 608 2.8 63 Comparative Example 53 N 1260 0.52 960 4.9 41.6 599 4.4 35 Example 54 N 1270 0.53 951 1.4 49.2 596 4.0 46 Example 55 N 1270 0.22 973 2.2 29.8 605 5.4 48 Example 56 N 1250 0.40 932 4.1 35.8 623 2.8 42 Comparative Example 57 0 1200 0.69 940 2.6 41.7 585 2.0 65 Example 58 O 1205 0.46 982 3.4 37.8 599 2.7 64 Example 59 O 1245 0.30 913 3.1 26.5 587 3.5 67 Example 60 O 1205 0.44 966 1.7 36.7 582 2.2 71 Comparative Example
    Petition 870180145531, of 10/29/2018, p. 66/111
    60/82 [Table 6]
    E E X X E P Μ EP R L 1The ME N T AL C Q O U M íP M O I N C E O NT E HOT LAMINATION FIRST COOLING SECOND COOLING STEP OFLAMINATIONCOLD NOTE PLATE HEATING TEMPERATURE E X P R E S S1 TEMPERATUREINCOMPLETE-DOGINLAMINATION TIME THROUGH STARTING COOLING RATEINAVERAGE COOLING COOLING TEMPERATURE Elapsed time up to 400 ° C REDUCTION REASON ° c ° c SECOND ° C / SECOND ° c TIME % 61 P 1275 0.26 939 3.6 41.6 565 4.9 38 Example 62 P 1200 0.16 950 3.6 26.2 640 7.9 43 Example 63 P 1265 0.54 933 3.9 30.1 600 6.2 44 Example 64 P 1260 1.55 923 2.9 24.9 608 3.1 53 Comparative Example 65 Q 1215 0.41 941 2.0 33.9 598 5.4 37 Example 66 Q 1265 0.81 901 9.2 13.5 638 6.6 53 Example 67 Q 1230 0.21 965 4.7 44.6 562 3.4 46 Example 68 Q 1205 2.03 922 2.5 37.7 597 4.5 44 Comparative Example 69 R 1240 0.40 942 2.6 40.3 535 1.7 46 Example 70 R 1255 0.72 902 3.3 21.4 600 4.0 53 Example 71 R 1210 0.50 915 2.2 31.5 585 4.0 64 Example 72 R 1280 0.65 910 3.3 32.6 555 3.6 45 Example 73 s 1270 0.55 928 2.4 29.7 560 1.7 50 Example 74 s 1215 0.27 887 4.0 30.2 568 3.2 50 Example 75 s 1220 0.76 958 3.4 52.5 562 3.0 50 Example 76 s 1255 0.65 961 2.2 34.1 608 4.4 62 Example 77 T 1275 0.48 920 2.2 52.5 514 1.5 40 Example 78 T 1240 0.14 926 2.6 36.8 587 3.2 50 Example 79 T 1245 0.49 952 2.9 44.1 585 2.9 61 Example 80 T 1235 0.32 916 3.1 31.1 566 3.9 50 Example 81 u 1265 0.48 917 4.5 38.2 609 3.5 63 Example 82 u 1250 0.22 894 4.6 22.9 598 6.0 41 Example 83 u 1255 0.25 917 4.3 39.3 579 2.4 56 Example 84 u 1275 0.52 906 3.5 25.4 566 3.6 53 Example 85 V 1280 0.79 936 4.7 42.2 558 2.8 71 Example 86 V 1255 0.48 963 2.0 46.6 586 3.0 53 Example 87 V 1215 0.43 893 4.4 35.4 565 4.3 42 Example 88 V 1200 0.76 958 4.8 31.0 596 3.1 43 Example 89 w 1210 0.71 917 2.3 27.6 579 3.6 58 Example 90 w 1240 0.26 964 3.8 28.5 605 5.3 65 Example
    Petition 870180145531, of 10/29/2018, p. 67/111
    61/82 [Table 7]
    E E X X E P Μ E P RL 1 O ME N T A L C Q O U M I P M O I N C E O NT E HOT LAMINATION FIRST COOLING SECOND COOLING STEP OFLAMINATION ACOLD NOTE PLATE HEATING TEMPERATURE E X P R E S S1 TEMPERATUREINCOMIPLETA-DOGINLAMINATION TIME THROUGH STARTING COOLING RATEINAVERAGE COOLING COOLING TEMPERATURE Elapsed time up to 400 ° C REDUCTION REASON ° c ° c SECOND ° C / SECOND ° c TIME % 91 w 1255 0.43 927 10.9 30.9 580 3.2 57 Example 92 w 1275 0.71 924 4.8 28.8 590 2.3 64 Example 93 X 1250 0.28 916 3.3 23.8 589 3.5 44 Example 94 X 1200 0.74 907 3.9 32.5 560 4.3 58 Example 95 X 1205 0.44 945 4.9 41.1 580 2.3 54 Example 96 X 1250 0.63 950 2.3 47.5 575 3.2 55 Example 97 Y 1225 0.50 909 3.0 11.6 610 2.8 60 Example 98 Y 1275 0.31 917 1.2 43.4 566 2.6 60 Example 99 Y 1215 0.21 912 2.9 33.6 599 2.5 47 Example 100 Y 1230 0.34 924 4.8 38.6 582 2.4 60 Example 101 z 1215 0.43 923 3.1 43.1 595 2.4 64 Example 102 z 1215 0.59 945 3.5 30.5 572 3.0 62 Example 103 z 1200 0.43 919 2.0 45.7 585 3.1 39 Example 104 z 1230 0.61 926 2.0 29.5 584 2.3 67 Example 105 AA 1225 0.24 936 3.5 35.6 593 4.8 53 Example 106 AA 1205 0.37 943 3.4 35.6 584 2.3 57 Example 107 AA 1240 0.49 907 1.9 35.4 520 1.6 60 Example 108 AA 1215 0.20 961 4.2 36.6 565 3.8 59 Example 109 AB 1235 0.65 950 2.6 36.5 588 4.0 46 Example 110 AB 1215 0.32 956 3.0 33.6 627 4.2 41 Example 111 AB 1225 0.50 945 3.7 29.8 610 2.8 44 Example 112 AB 1205 0.29 880 2.4 21.5 603 4.3 57 Example 113 B.C 1210 0.40 955 3.5 32.7 569 2.3 31 Example 114 B.C 1250 0.64 932 6.1 22.1 582 2.4 56 Example 115 B.C 1230 0.31 930 4.5 47.2 533 3.7 42 Example 116 B.C 1255 0.45 933 3.6 41.1 572 3.6 50 Example 117 AD 1210 0.32 952 2.8 26.6 602 7.5 58 Example 118 AD 1255 0.67 923 2.1 31.2 613 3.0 58 Example 119 AD 1240 0.59 916 2.1 37.7 611 4.7 44 Example 120 AD 1250 0.46 942 4.7 25.5 601 3.6 39 Example 121 AE 1225 0.66 930 2.3 34.2 597 2.8 56 Comparative Example 122 AF 1255 0.39 894 4.2 23.1 587 3.0 45 Comparative Example 123 AG 1225 0.78 937 3.7 34.4 563 2.5 50 Comparative Example 124 AH 1205 0.41 894 3.1 38 608 2.6 - Comparative Example 125 THERE 1255 0.31 920 1.7 37 589 3.5 73 Comparative Example 126 AJ TEST STOP DUE TO FRACTURE OF THE PLATE Comparative Example 127 AK 1205 0.47 880 2.6 34 600 2.3 40 Comparative Example 128 G 1200 0.18 894 3.5 4 618 3.8 40 Comparative Example129 G 1235 0.79 919 1.4 83 592 3.3 53 Comparative Example 130 G 1245 0.20 897 2.4 33 613 3.9 40 Comparative Example 131 V 1215 0.37 917 2.3 22 612 3.6 60 Comparative Example 132 V 1215 0.36 913 3.5 37 606 3.5 67 Comparative Example 133 B 1205 0.34 892 2.3 29 582 2.9 50 Comparative Example 134 B 1240 0.47 888 3.5 25 599 4.1 50 Comparative Example 135 0 1225 0.33 903 2.6 25 597 2.8 47 Comparative Example 136 0 1225 0.39 914 3.2 40 583 3.7 60 Comparative Example 137 D 1200 0.51 911 3.4 35 605 2.8 53 Comparative Example
    Petition 870180145531, of 10/29/2018, p. 68/111
    62/82 [00205] Next, the annealing step for the coating step is performed under each of the conditions illustrated in Tables 8 to 14 by using the continuous annealing coating line having the preheat zone, the reduction zone , and the coating zone.
    [00206] Note that in each of examples 2, 26, 38, 98 and 114, the bainite transformation process is carried out for a period after the steel sheet is immersed in the coating bath until it is cooled to the room temperature. On the other hand, in each of examples 10, 22, 42, 102 and 107, the bainite transformation process is carried out for a period after the steel sheet is immersed in the coating bath, and the alloy treatment is carried out until let it cool to room temperature. In the examples other than the above, the bainite transformation process is carried out after the first cooling step, and before the steel sheet is immersed in the coating bath.
    [00207] In addition, a third cooling step described in the Table is a cooling step within a range of 740 to 500 ° C, the bainite transformation process is a process of retaining the steel sheet at a temperature within a range of 300 to 470 ° C after it is immersed in the coating bath, and a fourth cooling step is a step of cooling to a temperature range of 150 ° C or less in the cooling process after retention.
    [00208] After the coating step, the reheating process (hardening step) is carried out for part of the steel sheets with the help of martensite tempering, in addition, the hardening lamination is carried out with each of the reduction ratios illustrated in Tables 8 to 14 for part of the steel plate.
    [00209] Note that a GI of the type of steel illustrated in each of the
    Petition 870180145531, of 10/29/2018, p. 69/111
    63/82
    Tables 8 to 14 represent a hot-dip galvanized steel sheet in which hot-dip galvanizing is carried out for the surface of the steel sheet, a GA-type steel represents a hot-dip galvanized steel sheet bonded to that the alloy treatment is carried out after hot dip galvanizing is carried out.
    [00210] Note that Ac3 in each of Tables 8 to 14 is calculated based on the following empirical formula.
    Ac3 [° C] = 910 - 203XC + 44.7Si - 30Mn + 200Al - 20Ni - 10Cr.
    Petition 870180145531, of 10/29/2018, p. 70/111 [Table 8]
    E E X X E P Μ E P RL 1 O MANDN TA L c o M P oN E N T EQU íMI c o TIP oDANDTHEÇ O CONTINUOUS RECOVERY COATING TYPEINSTEEL HEATING STEP THIRD COOLING STEP TRANSFOR PROCESS OF BAINITE APPLICATION FOURTH COOLING STEP TEMPERING STEP LAMINATIONCOLD PRE-HEATING ZONE REDUCTION ZONE COATING ZONE ALLOY FURNACE HEATING RATE AT 600 ° C TO 750 ° C T D A E E Q M UP EE CR IMT EU NR TTO Ac3 TEMPERATURE HEAT TEMP Ac3 COOLING RATE AT 740 ° C TO 500 ° C RETENTION TIME AT 300 ° C TO 470 ° C COOLING RATE T D T E E E Μ MP PAND ISR RA AT GHUHR MTHE REASONINREDU-DOG REASONINAIR □TN)O"□I Q D EU E FA EN A TT I II VGIVESTHEIN T D RAND THE EΜ VP B EAND THER N TA Η 1TOM U ER D NA E TO INPUT TEMPERATURE OF PLATESTEEL T D E E MP L E IR G A A T uR A T T E R Μ A P T O AM D E E NTO THE SECOND ° c ° C ° C THE SECOND SECOND ° C / SECOND ° c % PASTA% ° c ° c ° c SECOND 1 THE GI 5.3 790 815 -25 4.3 217.8 2.1 - - 1.0 0.058 0.10 468 473 - - Example 2 THE GI 5.9 803 815 -12 1.8 37.7 3.2 - - 1.0 0.208 0.07 463 458 - - Example 3 THE GA 4.7 827 815 12 32.9 55.8 2.6 - 0.20 1.0 0.125 0.08 462 453 523 20 Example 4 THE GI 3.8 821 815 6 1.6 36.4 3.1 - - 1.2 0.057 0.09 454 462 - - Example 5 B GI 2.6 813 841 -28 3.2 38.6 2.2 - - 1.0 0.054 0.10 461 466 - - Example 6 B GA 3.9 871 841 30 15.5 48.3 2.7 - 0.20 0.9 0.083 0.08 454 472 500 14 Example 7 B GA 5.1 874 841 33 6.4 56.9 3.3 - 0.20 1.1 0.109 0.1 1 457 477 495 18 Example 8 B GI 6.0 831 841 -10 2.6 26.1 5.3 - - 1.0 0.063 0.12 459 455 - - Example 9 Ç GI 4.7 766 790 -24 5.3 24.6 3.1 - - 1.2 0.389 0.10 458 458 - - Example 10 Ç GA 3.8 805 790 15 3.2 28.7 1.9 - - 1.2 0.01 1 0.09 465 476 496 21 Example 1 1 Ç GA 3.9 785 790 -5 18.5 87.6 3.5 360 - 0.7 0.019 0.10 454 449 551 4 Example 12 Ç GI 4.0 775 790 -15 24.4 29.9 3.6 - - 1.1 0.042 0.09 460 465 - - Example 13 D GI 1.2 827 823 4 5.0 1 10.4 4.8 - - 1.1 0.014 0.08 463 454 - - Example 14 D GA 2.9 815 823 -8 41.7 30.3 3.9 390 - 0.9 0.048 0.09 451 480 576 12 Example 15 D GA 4.0 819 823 -4 4.2 47.5 2.5 - - 0.7 0.028 0.09 454 448 504 16 Example 16 D GI 5.2 857 823 34 41.8 48.6 4.2 - - 0.9 0.371 0.09 462 452 - - Comparative Example 17 AND GI 5.0 892 926 -34 2.6 27.4 5.3 - - 0.7 0.056 0.1 1 461 459 - - Example 18 AND GI 2.3 924 926 -2 11.7 25.8 4.1 - - 0.7 0.021 0.09 460 448 - - Example 19 AND GA 2.8 943 926 17 5.7 37.9 4.1 - - 0.9 0.562 0.1 1 459 448 551 23 Example 20 AND GI 2.7 934 926 8 21.6 28.8 3.6 - - 0.9 0.064 0.12 464 456 - - Comparative Example 21 F GI 2.7 829 836 -7 2.7 130.3 2.4 - - 0.9 0.036 0.11 464 440 - - Example
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    Petition 870180145531, of 10/29/2018, p. 71/111 [Table 9]
    E E X X E P Μ E P RL 1 O ME NOKL c o M P O N E N T EQ U í M IC O T IP oDANDACTION CONTINUOUS RECOVERY COATING TYPEINSTEEL HEATING STEP THIRD COOLING STEP TRANSFOR PROCESS OF BAINITA APPLE FOURTH COOLING STEP TEMPERING STEP BLADE-DOGTHECOLD PRE-HEATING ZONE REDUCTION ZONEDOG COATING ZONE ALLOY FURNACE HEATING RATE AT 600 ° C TO 750 ° C T D A E E Q M UP EE CR IMT EU NR TTO Ac3 TEMPERATURE HEAT TEMP Ac3 RATE □ AND COOLING AT 740 ° C TO 500 ° C RETENTION TIME AT 300 ° C TO 470 ° C COOLING RATE T D T E E E Μ MP PAND ISR RA AT GHUHR MTHE REASONINREDUDOG REASONINAIR TI roO"0Ϊ Q D E U E F A EN A TT I II VGIVESTHEDAND T D RAND THE EΜ VP B EAND THER N TA Η ITOM U ER D NA E TO TEMPE RATURE OF ENTERING THE STEEL SHEET T D E E MP L E I R G A A TUR A T T E RΜ A P T O AM D E E NTO ° C / SECOND ° c ° C ° C ° C / SECOND SECOND ° C / SECOND ° c % PASTA% ° c ° C ° c SECOND 22 F GA 12.3 789 836 -47 44.8 207.6 2.2 - - 0.7 0.323 0.10 456 443 481 22 EXAMPLE 23 F GA 4.2 858 836 22 4.5 169.0 4.4 - - 1.0 0.025 0.10 451 471 515 17 EXAMPLE 24 F GI 6.5 818 836 -18 23.2 31.1 4.6 - - 1.0 0.295 0.10 459 457 - - Comparative Example 25 G GI 4.3 813 790 23 42.2 29.1 2.9 325 - 0.8 0.181 0.08 463 443 - - EXAMPLE 26 G GI 4.4 761 790 -29 1.8 367.1 5.2 - - 1.0 0.501 0.10 455 471 - - EXAMPLE 27 G GA 6.3 762 790 -28 7.7 26.5 1.7 - - 0.9 0.004 0.10 458 480 496 20 EXAMPLE 28 G GI 3.7 785 790 -5 4.5 30.2 2.5 - - 0.9 0.064 0.09 458 466 - - Comparative Example 29 H GI 3.9 888 903 -15 6.4 29.4 4.3 - - 1.0 0.007 0.17 459 469 - - EXAMPLE 30 H GA 3.3 881 903 -22 25.6 58.1 3.4 - - 0.8 0.0004 0.08 461 475 584 21 EXAMPLE 31 H GA 5.0 875 903 -28 2.0 28.8 1.6 - - 1.1 0.043 0.09 460 446 503 13 EXAMPLE 32 H GI 5.7 907 903 4 35.2 27.7 4.2 - - 1.0 0.023 0.09 456 455 - - Comparative Example 33 I GI 5.5 965 949 16 2.1 235.8 2.8 - - 1.1 0.028 0.10 461 471 - - EXAMPLE 34 I GI 2.9 936 949 -13 4.7 47.4 4.2 - - 0.7 0.190 0.09 458 458 - - EXAMPLE 35 I GA 4.6 971 949 22 15.7 57.6 4.4 - 0.50 1.0 0.052 0.09 462 469 542 15 EXAMPLE 36 I GI 6.4 949 949 0 4.5 29.5 4.5 - - 0.7 0.045 0.10 464 464 - - Comparative Example 37 J GI 5.1 760 795 -35 38.2 55.5 5.3 - - 1.0 0.457 0.10 460 446 - - EXAMPLE 38 J GI 5.4 823 795 28 8.9 27.3 3.4 - - 1.0 0.013 0.08 458 459 - - EXAMPLE 39 J GA 4.4 790 795 -5 13.8 268.9 4.1 - - 1.0 0.046 0.10 463 463 512 43 EXAMPLE 40 J GI 6.7 794 795 -1 6.8 137.9 5.3 - - 0.9 0.013 0.11 467 459 - - Comparative Example 41 K GI 4.0 839 825 14 1.3 29.6 1.8 - - 1.0 0.047 0.13 453 473 - - EXAMPLE 42 K GA 4.7 810 825 -15 7.8 267.9 2.0 - - 0.7 0.003 0.10 458 461 485 34 EXAMPLE
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    Petition 870180145531, of 10/29/2018, p. 72/111 [Table 10]
    E E X X E P Μ E P RL 1 O ME N TA L c o M P O N E N T EQ U i MI C O T IP oDANDAction CONTINUOUS RECOVERY COATING TYPEINSTEEL HEATING STEP THIRD COOLING STEP TRANSFOR PROCESS OF BAINITE APPLICATION FOURTH COOLING STEP TEMPERING STEP LAM INACTIONTHECOLD PRE-HEATING ZONE REDUCTION ZONEDOG COATING ZONE ALLOY FURNACE HEATING RATE AT 600 ° C TO 750 ° C T D A E E Q M UP EE CR IMT EU NR TTO Ac3 TEMPE R AT LIRAFROM HEATING TO Ac3 COOLING RATE AT 740 ° C TO 500 ° C RETENTION TIME AT 300 ° C TO 470 ° C COOLING RATE T D T E E E Μ MP PAND ISR RA AT GHUHR MTHE REASONINREDUDOG REASONINAIR TJI roOOΪ Q D E U E F A EN A T T I II VGIVESTHEDAND T D RAND THE EΜ VP B EAND THER N TA Η ITOM U ER D NA E TO TEMPE RATURE OF ENTERING THE STEEL SHEET T D E E MP L E I R G A A T uR A T T E R Μ AP TO AMD E E NTO ° C / SECOND ° c ° C ° C ° C / SECOND SECOND ° C / SECOND ° c % PASTA% ° c ° C ° c SECOND 43 K GA 1.2 839 825 14 38.1 108.2 3.6 410 - 1.0 0.897 0.10 462 454 530 14 EXAMPLE 44 K GI 2.8 791 825 -34 41.3 25.9 2.2 - - 1.0 0.025 0.10 458 471 - - Comparative Example 45 L GI 4.8 899 891 8 16.7 57.5 5.3 - - 0.9 0.093 0.10 465 477 - - EXAMPLE 46 L GI 5.1 883 891 -8 4.8 29.2 4.3 - - 1.0 0.008 0.08 456 463 - - EXAMPLE 47 L GA 5.5 897 891 6 4.4 319.6 2.6 - - 0.9 0.001 0.12 464 452 491 20 EXAMPLE 48 L TEST STOP DUE TO FRACTURE OF THE STEEL SHEET IN THE COLD LAMINATION STEP Comparative Example 49 M GI 2.7 901 872 29 15.4 27.0 2.8 - - 0.9 0.008 0.09 454 475 - - EXAMPLE 50 M GA 4.5 859 872 -13 1.9 219.5 2.4 - - 1.2 0.123 0.07 464 449 489 21 EXAMPLE 51 M GA 1.7 885 872 13 20.7 26.8 1.6 - - 0.9 0.030 0.08 467 458 535 7 EXAMPLE 52 M GI 3.8 750 872 -122 2.8 28.6 1.7 - - 0.8 0.060 0.09 455 474 - - Comparative Example 53 N GI 4.6 863 875 -12 24.5 130.0 5.3 395 - 0.8 0.151 0.04 454 446 - - EXAMPLE 54 N GA 1.6 870 875 -5 4.3 26.7 4.6 - - 0.8 0.005 0.10 454 475 538 12 EXAMPLE 55 N GA 2.4 853 875 -22 17.8 56.6 1.7 - - 0.9 0.134 0.08 455 462 505 38 EXAMPLE 56 N GI 1.5 868 875 -7 4.6 1150 2.3 - - 1.1 0.251 0.12 462 471 - - Comparative Example 57 0 GI 2.6 806 801 5 2.8 55.0 4.1 - - 1.2 0.025 0.09 464 441 - - EXAMPLE 58 O GA 7.5 789 801 -12 10.1 30.7 3.5 - - 0.8 0.112 0.10 465 447 528 111 EXAMPLE 59 O GA 4.0 822 801 21 6.4 188.7 2.6 - - 0.8 0.014 0.12 457 460 495 15 EXAMPLE 60 O GI 3.5 822 801 21 17.6 5Ό 4.0 - - 0.8 0.081 0.11 455 454 - - Comparative Example 61 P GI 6.1 795 817 -22 23.5 106.6 4.0 - - 0.8 0.067 0.10 461 456 - - EXAMPLE 62 P GI 4.0 799 817 -18 41.9 37.9 4.0 - - 0.8 1,520 0.09 461 449 - - EXAMPLE 63 P GA 1.4 804 817 -13 7.1 29.7 2.6 - - 1.0 0.204 0.10 456 463 508 24 EXAMPLE
    66/82
    Petition 870180145531, of 10/29/2018, p. 73/111 [Table 11]
    E E X XE P Μ EP R L 1The MANDN TTHEL c o M P O N E N T EQ U í M I c o TypeDANDACTION CONTINUOUS RECOVERY COATING TYPEINSTEEL HEATING STEP THIRD COOLING STEP TRANSFOR PROCESS OF BAINITE APPLICATION FOURTH COOLING STEP TEMPERING STEP LAMINATION ACOLD PRE-HEATING ZONE REDUCTION ZONEDOG COATING ZONE ALLOY FURNACE HEATING RATE AT 600 ° C TO 750 ° C Γ D E E Q M UP EE CR IMΓ EU NR TTO Ac3 TEMPERATURE HEAT TEMP Ac3 RATE □ AND COOLING AT 740 ° C TO 500 ° C RETENTION TIME AT 300 ° C TO 470 ° C COOLING RATE T D T E E E Μ MP PAND ISR RA AT GHUHR MTHE REASONINREDUDOG REASONINAIR TJI roO Q D E U E F A EN A TT I II VGIVESTHEDAND T D RAND THE EΜ VP B EAND THER N TA Η ITOM U ER D NA E TO TEMPE RATURE OF ENTERING THE STEEL SHEET T D E E MP L E I R G A A T uR A T T E RΜ A P T O AM D E E NTO ° C / SECOND ° c ° C ° C ° C / SECOND SECOND ° C / SECOND ° c ° / o PASTA% ° c ° C ° c SECOND 64 P GI 4.2 787 817 -30 18.8 26.7 3.9 - - 1.2 0.050 0.09 460 464 - - Comparative Example 65 Q GI 2.4 961 993 -32 23.9 28.4 4.7 - - 1.0 0.020 0.09 454 470 - - EXAMPLE 66 Q GI 1.6 974 993 -19 8.7 26.4 2.5 - - 1.2 0.173 0.08 469 460 - - EXAMPLE 67 Q GA 4.5 947 993 -46 6.2 28.4 5.1 - - 1.1 0.013 0.09 454 439 539 21 EXAMPLE 68 Q GI 3.5 962 993 -31 12.4 106.0 4.7 - - 1.0 0.052 0.11 457 476 - - Comparative Example 69 R GI 5.3 900 874 26 7.1 36.1 5.4 - 0.45 0.9 0.031 0.11 456 472 - - EXAMPLE 70 R GA 3.2 869 874 -5 7.3 267.2 5.3 - - 1.0 0.011 0.08 458 467 610 4 EXAMPLE 71 R GA 2.9 869 874 -5 27.4 38.1 4.9 - - 1.0 0.046 0.09 463 458 500 35 EXAMPLE 72 R GI 6.2 903 874 29 28.2 186.9 4.8 - - 0.8 0.100 0.10 463 454 - - EXAMPLE 73 s GI 3.3 794 797 -3 24.9 27.7 2.0 280 - 0.9 0.035 0.08 467 445 - - EXAMPLE 74 s GA 5.7 809 797 12 6.6 29.9 3.2 - - 1.0 1.12 0.09 465 472 51 1 24 EXAMPLE 75 s GA 8.3 819 797 22 11.5 268.5 2.4 - - 1.2 0.006 0.09 465 457 526 10 EXAMPLE 76 s GI 2.5 769 797 -28 21.9 51.5 5.0 - - 0.7 0.501 0.09 464 466 - - EXAMPLE 77 T GI 6.4 840 834 6 1.4 27.7 4.3 - - 0.9 0.011 0.07 457 467 - - EXAMPLE 78 T GA 1.9 830 834 -4 28.5 46.2 3.6 - - 1.2 0.301 0.09 455 448 590 24 EXAMPLE 79 T GA 4.2 834 834 0 3.5 26.2 2.6 - - 1.1 0.066 0.07 464 476 562 21 EXAMPLE 80 T GI 4.4 823 834 -11 16.5 137.1 2.0 - - 1.1 0.014 0.09 459 452 - - EXAMPLE 81 u GI 3.3 838 819 19 17.4 25.5 1.6 - - 1.0 0.007 0.08 462 456 - - EXAMPLE 82 u GA 2.7 829 819 10 3.6 27.3 3.6 310 - 1.1 0.081 0.08 462 448 507 25 EXAMPLE 83 u GA 4.0 803 819 -16 40.2 56.5 3.3 - - 1.0 0.015 0.11 455 480 535 20 EXAMPLE 84 u GI 2.4 822 819 3 33.8 58.0 3.4 - - 0.8 0.050 0.10 456 477 - - EXAMPLE
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    Petition 870180145531, of 10/29/2018, p. 74/111 [Table 12]
    E E X X E P Μ E P RL 1 O ME NOKL c o M P O N E N T EQ U í M1 C O T 1P oINTHEÇ O CONTINUOUS RECOVERY COATING TYPEINSTEEL HEATING STEP THIRD COOLING STEP TRANSFOR PROCESS OF BAINITE APPLICATION FOURTH COOLING STEP TEMPERING STEP BLADE-DOGTHECOLD PRE-HEATING ZONE REDUCTION ZONEDOG COATING ZONE ALLOY FURNACE HEATING RATE AT 600 ° C TO 750 ° C Γ D E E Q M UP EE CR IMT EU NR TTO Ac3 TEMPERATURE HEAT TEMP Ac3 COOLING RATE AT 740 ° C TO 500 ° C RETENTION TIME AT 300 ° C TO 470 ° C COOLING RATE T D T E E E Μ MP PAND ISR RA AT GHUHR MTHE REASONINREDUDOG REASONINAIR TJTN)O"0I Q D EU E FA EΝ A TT 1 11 VGIVESTHEDAND T D RAND THE EΜ VP B EAND THER Ν TA Η ITOM U ER D NA E TO TEMPE RATURE OF ENTERING THE STEEL SHEET T D E E M P L E I R G A A T u R A T T E R Μ A P T O AMD E E NT O ° C / SECOND ° c ° C ° C ° C / SECOND SECOND ° C / SECOND ° c % PASTA% ° c ° C ° c SECOND 85 V GI 4.3 808 819 -11 37.0 26.5 1.9 - - 1.2 0.067 0.10 462 443 - - EXAMPLE 86 V GI 4.0 795 819 -24 1.6 28.5 2.9 - - 1.2 0.091 0.09 466 466 - - EXAMPLE 87 V GA 2.1 787 819 -32 3.7 57.0 3.8 - - 0.8 0.015 0.09 453 470 511 21 EXAMPLE 88 V GI 2.1 815 819 -4 13.8 26.3 4.7 - - 1.0 0.112 0.10 458 478 - - EXAMPLE 89 w GI 3.0 924 925 -1 2.3 190.3 4.2 - - 0.9 0.269 0.11 451 465 - - EXAMPLE 90 w GI 2.8 917 925 -8 8.2 26.3 3.5 - - 1.1 0.019 0.07 458 472 - - EXAMPLE 91 w GA 2.7 923 925 -2 4.2 28.7 4.4 - - 0.8 0.177 0.10 458 462 510 67 EXAMPLE 92 w GI 4.5 909 925 -16 6.6 265.9 3.1 - - 0.9 0.057 0.08 457 471 - - EXAMPLE 93 X GI 3.7 916 915 1 40.4 230.1 4.8 - - 0.9 0.041 0.11 460 440 - - EXAMPLE 94 x GI 6.6 910 915 -5 3.1 30.3 2.5 - - 1.2 0.083 0.10 459 439 - - EXAMPLE 95 x GA 4.0 944 915 29 6.2 28.7 2.4 - - 0.9 0.013 0.08 453 467 485 13 EXAMPLE 96 x GI 4.3 900 915 -15 54.7 27.1 2.5 - - 0.8 0.061 0.08 458 460 - - EXAMPLE 97 Y GI 3.5 856 869 -13 3.8 126.2 3.1 - - 1.0 0.060 0.08 465 469 - - EXAMPLE 98 Y GI 4.9 895 869 26 3.3 28.6 4.5 - - 1.0 0.023 0.08 461 467 - - EXAMPLE 99 Y GA 4.5 848 869 -21 38.5 29.3 4.4 - - 0.8 0.051 0.10 452 444 492 16 EXAMPLE 100 Y GI 4.0 863 869 -6 16.1 107.4 4.7 - - 1.1 0.007 0.10 460 456 - - EXAMPLE 101 z GI 2.4 753 784 -31 11.5 29.6 3.0 - - 0.8 0.033 0.09 462 471 - - EXAMPLE 102 z GA 2.0 771 784 -13 50.5 190.0 4.6 - - 0.8 0.004 0.07 463 461 606 23 EXAMPLE 103 z GA 4.5 788 784 4 3.0 30.8 5.0 - - 0.8 0.087 0.12 462 465 535 23 EXAMPLE 104 z GI 4.8 775 784 -9 15.8 57.0 3.2 - - 1.0 0.028 0.10 464 478 - - EXAMPLE 105 AA GI 6.7 798 800 -2 25.4 226.6 3.0 - - 0.8 0.058 0.08 458 446 - - EXAMPLE
    68/82
    Petition 870180145531, of 10/29/2018, p. 75/111 [Table 13]
    E E X XE P Μ EP R L 1The MANDN T AL c o M P O N E N T EQ U í M I c o T IP oINTHEÇ O CONTINUOUS RECOVERY COATING TYPEINSTEEL HEATING STEP THIRD COOLING STEP TRANSFOR PROCESS OF BAINITE APPLICATION FOURTH COOLING STEP TEMPERING STEP BLADE-TION ACOLD PRE-HEATING ZONE REDUCTION ZONEDOG COATING ZONE ALLOY FURNACE HEATING RATE AT 600 ° C TO 750 ° C T D A E E Q M UP EE CR IMT EU NR TTO Ac3 TEMPERATURE HEAT TEMP Ac3 COOLING RATE AT 740 ° C TO 500 ° C RETENTION TIME AT 300 ° C TO 470 ° C COOLING RATE T D T E E E Μ MP PAND ISR RA AT GHUHR MTHE REASONINREDUDOG REASONINAIR YOUTΓΟO"0Iro Q D E U E F A EΝ A T T I II VGIVESTHEIN T D RAND THE EΜ VP B EAND THER Ν TA Η ITOM U ER D NA E TO TEMPE RATURE OF ENTERING THE STEEL SHEET T D E E MP L E I R G A A T uR A T T E R Μ A P T O AMD E E NT O ° C / SECOND ° c ° C ° C ° C / SECOND SECOND ° C / SECOND ° c ° / o PASTA% ° c ° C ° C SECOND 106 AA GA 3.3 805 800 5 2.9 35.8 2.8 - 0.80 0.9 0.114 0.08 462 480 - - EXAMPLE 107 AA GA 1.9 819 800 19 33.4 104.9 4.1 425 - 0.9 0.112 0.08 460 455 532 12 EXAMPLE 108 AA GI 2.6 820 800 20 5.4 25.6 2.4 - - 1.0 0.014 0.11 462 448 - - EXAMPLE 109 AB GI 6.2 827 842 -15 3.4 25.8 3.8 - - 0.9 0.660 0.10 466 477 - - EXAMPLE 110 AB GA 3.0 856 842 14 8.0 130.7 4.1 - 0.30 0.9 0.042 0.09 458 454 527 15 EXAMPLE 111 AB GA 4.6 848 842 6 44.3 233.0 3.9 - - 0.8 0.120 0.09 464 454 529 12 EXAMPLE 112 AB GI 3.9 864 842 22 14.8 26.6 4.6 - - 1.0 0.208 0.09 463 449 - - EXAMPLE 113 B.C GI 2.8 757 769 -12 20.0 25.8 4.3 - - 0.9 0.074 0.12 458 463 - - EXAMPLE 114 B.C GI 1.9 772 769 3 8.3 190.4 4.1 - - 0.9 0.104 0.10 465 469 - - EXAMPLE 115 B.C GA 2.1 781 769 12 8.5 29.4 2.0 - - 1.0 0.087 0.11 458 477 501 10 EXAMPLE 116 B.C GI 3.5 801 769 32 23.4 38.1 4.1 - - 0.9 0.288 0.10 462 451 - - EXAMPLE 117 AD GI 4.6 845 836 9 5.1 24.7 1.7 - - 0.8 0.004 0.11 465 458 - - EXAMPLE 118 AD GI 5.6 820 836 -16 5.4 27.6 2.9 - - 0.9 0.512 0.11 461 469 564 18 EXAMPLE 119 AD GA 4.0 850 836 14 24.5 25.7 4.5 - - 0.9 0.022 0.09 466 459 506 10 EXAMPLE 120 AD GI 3.4 851 836 15 12.8 127.0 1.9 - - 0.8 0.064 0.09 463 456 - - EXAMPLE 121 AE GI 4.1 872 849 23 10.8 29.2 4.7 - - 0.8 0.038 0.09 460 467 - - Comparative Example 122 AF GI 3.7 785 769 16 16.2 26.4 4.7 - - 0.8 0.040 0.09 465 462 - - Comparative Example 123 AG GI 3.3 866 878 -12 14.4 29.3 5.4 - - 0.8 0.051 0.10 464 479 - - Comparative Example
    69/82
    Petition 870180145531, of 10/29/2018, p. 76/111 [Table 14]
    E E X X E PΜ E P RL 1 O MANDN TA L c o M P O N E N T EThuM IC O T I PODANDAction CONTINUOUS RECOVERY COATING TYPEINSTEEL HEATING STEP THIRD COOLING STEP TRANSFOR PROCESS OF BAINITE APPLICATION FOURTH COOLING STEP TEMPERING STEP BLADE-DOGTHECOLD PRE-HEATING ZONE REDUCTION ZONE COATING ZONE ALLOY FURNACE HEATING RATE AT 600 ° C TO 750 ° C Γ D E E Q M UP EE CR IMΓ EU NR TTO Ac3 TEMPERATURE HEAT TEMP Ac3 COOLING RATE AT 740 ° C TO 500 ° C RETENTION TIME AT 300 ° C TO 470 ° C COOLING RATE T D T E E E Μ MP PAND ISR RA AT GHUHR MTHE REASONINREDUDOG REASONINAIR TJIK)OYOUIK) Q D E U E F A EN A TT 1 11 VGIVESTHEDAND T D R E E Μ V P B E A S R N T A Η I TOM U E R D N A E TO TEMPE RATURE OF ENTERING THE STEEL SHEET T D E E MP L E I R G A A TURTHE T T E R Μ A P T O AMD E E NTO ° C / SECOND ° c ° c ° C ° C / SECOND SECOND O / SECOND ° c % PASTA% ° c ° C ° C SECOND 124 AH - TEST STOP DUE TO FRACTURE IN THE COLD LAMINATION STEP Comparative Example 125 THERE GA 3.8 800 782 18 16.1 33 3.3 - - 1.0 0.096 0.08 460 463 512 14 Comparative Example 126 AJ - TEST STOP DUE TO FRACTURE ON THE PLATE Comparative Example 127 AK - TEST STOPPED DUE TO WELDING ZONE FRACTURE IN THE CONTINUOUS STEPPING STEP Comparative Example 128 G GA 2.3 771 790 -19 5.6 138 2.6 - - 1.1 0.127 0.09 462 461 541 28 ExampleComparative 129 G GA 3.7 768 790 -22 23.3 101 3.4 - - 1.0 0.089 0.10 462 458 492 25 Comparative Example 130 G GA 35.0 765 790 -25 22.6 143 2.5 - - 1.1 0.166 0.08 467 461 532 20 Comparative Example 131 V GA 3.6 814 819 -5 04 29 3.4 - - 0.9 0.034 0.11 461 461 547 23 Comparative Example 132 V GA 3.6 829 819 10 16.7 72 Q1 - - 1.1 0.104 0.11 465 456 510 13 Comparative Example 133 B GA 2.7 855 841 14 19.4 35 2.9 - - 03 0.099 0.09 465 466 542 13 Comparative Example 134 B GA 3.2 864 841 23 23.2 30 2.3 - - L8 0.092 0.08 463 456 509 19 Comparative Example 135 0 GA 3.0 814 801 13 14.0 116 2.6 - - 1.0 0.0000 0.08 467 464 542 16 Comparative Example 136 0 GA 3.9 824 801 23 22.0 154 2.4 - - 1.1 2.24 0.10 461 468 526 21 Comparative Example 137 D GA 2.8 790 790 0 13.8 79 3.1 - - 0.9 0.041 0.40 464 460 523 19 Comparative Example
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    Petition 870180145531, of 10/29/2018, p. 77/111
    71/82 [00211] In each of the hot-dip galvanized steel sheets (or the hot-dip galvanized steel sheets attached) of examples 1 to 137 obtained as mentioned above, a microstructure within a thickness range 1 / 8 centered around 1/4 sheet thickness of a surface to 3/8 thickness centered around 1/4 plate thickness from the surface is observed, and a volume fraction is measured. The results of this are illustrated in Tables 15 to 18.
    [00212] Within a fraction of microstructure, an amount of residual austenite is measured by X-ray diffraction, the others are obtained by cutting a thick cross-section in parallel to the rolling direction of the steel sheet, and performing a nital stripping for the polished cross section on a mirror surface, and observing the cross section using the field emission scanning electron microscope (FE-SEM).
    [00213] In addition, an iron content at 1/2 thickness of the hot-dip galvanized bonded layer is measured by the use of EDX. The results of these are illustrated in Tables 15 to 18.
    [00214] Furthermore, the amount of solid solution carbon in the residual austenite is found by discovering a lattice constant “a” of the residual austenite by performing the X-ray diffraction test under the same condition as the fraction measurement area of residual austenite, and by using the aforementioned expression (2).
    [00215] In addition, the random X-ray intensity ratio of the residual austenite FCC iron is measured by X-ray diffraction.
    [00216] An average grain diameter of the residual austenite crystal grains relative to the rolling direction is set to d (RD), an average grain diameter relative to the plate width direction is set to d (TD), and the parameter d (RD) / d (TD) composed of both is calculated. Note that the crystal grain of the residual austenite
    Petition 870180145531, of 10/29/2018, p. 78/111
    72/82 is evaluated by finishing a surface parallel to the surface of the plate at 1/4 thickness on the mirror surface, performing the high resolution crystal orientation analysis using the EBSD method (Electron Bach-Scattering Diffraction) using from FE-SEM (Field Emission Scanning Electron Microscopy). A measurement step is set to 0.1 mm, and a region where 10 points or more each represents a diffraction pattern of the FCC iron aggregate, and whose crystal disorientation between them is less than 10 ° is defined as the grain crystal of residual austenite. As for the grain diameter, the grain diameters in the lamination direction and in the plate width direction are each measured for 30 pieces to 300 pieces of the randomly selected residual austenite crystal grains.
    [00217] In addition, a thickness of the decarbonized layer is measured by finishing the cross section of thickness parallel to the lamination direction on the mirror surface, and observing the use of FE-SEM. Note that three or more positions of the thickness of the decarbonized layer are measured for each steel plate, and an average value of these is adjusted as the thickness of the decarbonized layer.
    [00218] Additionally, an oxide density is calculated by finishing the thickness cross section in parallel to the lamination direction on the mirror surface, counting the number of oxides per observation of 7 mm for two minutes using the FE-SEM , or by using an observation area required to count up to 1000 oxides. In addition, an average grain diameter of the oxides is calculated by averaging the equivalent circle diameters from 100 to 1000 oxides selected at random.
    [00219] Then, a test to assess the hardenability is performed by measuring the quantity of BH.
    [00220] First, a JIS No. 5 test piece is produced from each
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    73/82 steel sheet obtained by the aforementioned production method, pre-tension of 2% is added, and then a heat treatment corresponding to a coating cooking is carried out with a condition of 170 ° C x 20 min retention, and the amount of hardenability (BH) is measured. Note that the amount of BH relative to the rolling direction is set to DBH (RD), the amount of BH relative to the direction of the sheet width is set to DBH (TD), and in the present assessment, a negative judgment is given for one whose quantity of BH is less than 65 MPa. Additionally, one in which DBH (RD) / ABH (TD) is within a range of 0.8 to 1.2 is judged to be passed.
    [00221] Next, tension test pieces based on JIS Z 2201 are obtained from the hot dip galvanized steel sheets (or the linked hot dip galvanized steel sheets) of examples 1 to 109, a test Stress is performed based on JIS Z 2241, and yield stress, tensile strength, and total elongation are measured.
    [00222] An external appearance of the steel sheet surface is evaluated by realizing a non-coating occurrence state by visual determination. An “x” sign is a steel plate in which no coating with a diameter of 0.5 mm or more is observed, and deviates from the appearance tolerance range, and an “O” sign is a steel plate having an appearance practically tolerable external environment other than the above.
    [00223] In addition, a tape is adhered to the inside of a curved portion and then the strip is peeled after a 60 ° V bend test, to assess the adhesiveness of the coating at a processing time when a compressive stress its applied.
    [00224] The adhesiveness of the coating is evaluated from a peeled state of the peeled coating layer along with the tape. An “x” sign is an almost intolerable steel plate whose width
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    74/82 peeled is 7.0 mm or more. An “O” sign is a steel plate having a coating tolerance that is practically tolerable other than the one above.
    [00225] The test results, results of the evaluation of the above, are illustrated in Table 15 to Table 18.
    [00226] Note that in Tables 1 to 18, the numerical values and underlined symbols represent outside the range of the present invention. In this case, an example 124 is an example in which the Si content is high for the chemical component, the steel sheet is fractured in the cold rolling stage, and the test is stopped.
    [00227] The hot dipped galvanized steel sheet of an example 125 is an example in which the Si content is small, sufficient residual austenite cannot be obtained, a batch of iron-based carbides is generated during the alloy treatment of the coating layer, and therefore strength and ductility, are deteriorated.
    [00228] An example 126 is an example in which the Mn content is large for the chemical component, the plate is fractured for a period after the casting is completed until it is supplied for the hot rolling step, and the test is stopped.
    [00229] An example 127 is an example in which the Al content is high for the chemical component, a portion previously welded to the steel sheet is fractured in the continuous annealing step, and the test is stopped.
    [00230] An example 128 is an example in which the cooling rate after the hot rolling of hot-dip galvanized steel sheet is low for the average cooling rate of 10 to 60 ° C / second (refer to to [0077]), residual austenite after annealing extends, and the anisotropy of temperability increases.
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    75/82 [00231] An example 129 is an example in which on the hot-dip galvanized steel plate bonded, the cooling rate after hot rolling is large, the texture of residual austenite after annealing increases, and anisotropy temperability increases.
    [00232] An example 130 is an example in which on the hot-dip galvanized steel sheet connected, the heating rate at 650 to 750 ° C of the heating step in the annealing step is large for the heating rate at 650 to 750 ° C of the heating step in the annealing step of 20 ° C / second or less (refer to [0082]), the anisotropy of residual austenite after annealing increases, and the anisotropy of temperability increases.
    [00233] An example 131 is an example in which on the hot-dip galvanized steel sheet bonded, the cooling rate at 740 to 500 ° C of the first cooling step in the annealing step is small for the cooling rate at 740 at 500 ° C of the first cooling step in the annealing step of 1.0 ° C / second or more (refer to [0087]), the ferrite fraction increases excessively, and the hardenability deteriorates.
    [00234] An example 132 is an example in which on the hot-dip galvanized steel sheet connected, the cooling rate in the second cooling step in the annealing step is small for the cooling rate in the second cooling step in the annealing of 0.5 ° C / second or more (refer to [0091]), a batch of coarse carbide is generated, the residual austenite fraction is lowered, and the strength and temperability deteriorate.
    [00235] An example 133 is an example where in the hot-dip galvanized steel sheet connected, the air ratio in the preheating zone of the coating step is small to the air ratio of 0.7 to 1.2 in coating step (refer to [0084]), the thickness of the decarbonized layer in the surface layer makes
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    76/82 if insufficient, and the adhesiveness of the coating deteriorates.
    [00236] An example 134 is an example where in the hot-dip galvanized steel sheet connected, the air ratio in the preheating zone of the coating step is large, and the thickness of the decarbonized layer in the surface layer becomes excessively large, and its fatigue strength significantly deteriorates, and is practically intolerable.
    [00237] An example 135 is an example in which in the hot-dip galvanized steel sheet connected, the atmosphere in the reduction zone in the coating step is outside the range of the present invention as for the partial pressure ratio of 0.0001 at 2.00 of the atmosphere of the reduction zone in the coating step (refer to [0086]), the amount of oxides in the decarbonized layer in the surface layer is small, a fracture starting from an interface between the decarbonized layer and the base material occurs in a coating peeling test, the external appearance deteriorates, and therefore the adhesiveness of the coating is assessed to be deteriorated.
    [00238] An example 136 is an example where in the bonded hot dip galvanized steel sheet, the atmosphere of the reduction zone in the coating step is outside the range of the present invention, the decarbonized layer in the surface layer excessively grows, and fatigue strength significantly deteriorates, and is almost intolerable.
    [00239] An example 137 is an example in which in the hot dip galvanized steel sheet bonded, an effective concentration of Al in the coating bath is high for the effective amount of Al from 0.01 to 0.18 weight% in coating step (refer to [0088]), and the quality of the external appearance significantly deteriorates on inspection immediately after the annealing step, and therefore the
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    77/82 subsequent observation of the microstructure and property evaluation test are ceased.
    Petition 870180145531, of 10/29/2018, p. 84/111 [Table 15]
    E E XX E P Μ EP R L 1 O ME NOKL CQ O u M íP M O IN C E O NTAND TI P oINACTION MICROSTRUCTURE COATING LAYER, LAYER □ AND STEEL SHEET SURFACE PROPERTY STEEL TYPE STRUCTURAL FRACTION AUSTENITE WITHHELD AVERAGE DISPLACEMENT DENSITY DESCARBURI ZADA LAYER THICKNESS DENSITYOFOXIDE SIZEOFOXIDE A E P X A T R E È R N N C A ITHE PEELING OF THE COATING TRACTION PROPERTY COOKING TEMPERABILITY FERRI TA BAINI TA FERRITA BAINÍTI CA MARTENSI TA MARTEN SITA TEMPERADO AUSTENITERETENTION OTHERS AMOUNT OF CARBON IN SOLID SOLUTION INTENT-SITYINX-RAY d (RD)/ d (T D) SCOPE LIMIT TENSION RESISTANCE TOTAL ALONG ZlBH (RD) Z | BH (TD) ^ | BH (RD)(TD) % % % % ° / o % % PASTA% 10 l3 / m 2 already 10 12 oxides nm MPa MPa % MPa MPa 1 THE GI 35 37 18 0 0 9 1 0.81 2.0 1.06 2.7 1.77 69.8 51 O O 603 961 21 93 92 1.01 EXAMPLE 2 THE GI 30 28 32 3 0 7 0 0.79 1.7 119 3.1 1.32 54.1 52 O O 886 1231 16 82 75 1.09 EXAMPLE 3 THE GA 12 52 15 12 □ 8 1 0.92 1.8 0.96 24.7 1.21 42.7 56 O O 1041 1277 13 102 109 0.93 EXAMPLE 4 THE GI 24 40 30 0 0 6 0 0.78 1.9 0.90 3.5 0.67 52.4 58 O O 704 1066 19 86 82 1.04 EXAMPLE 5 B GI 42 39 12 0 □ 7 0 0.81 2.0 101 1.7 1.27 103.5 51 O O 531 958 17 86 80 1.07 EXAMPLE Θ B GA 14 57 15 5 0 8 1 0.78 2.5 0.87 14.2 2.19 178.4 49 O O 935 1303 11 98 89 1.10 EXAMPLE 7 B GA 16 37 38 2 0 7 0 0.76 1.8 1.24 14.9 1.69 65.1 65 O O 938 1304 18 93 93 1.00 EXAMPLE 8 B GI 29 35 28 1 1 6 0 0.78 2.2 0.77 1.8 1.63 49.7 55 O O 803 1187 14 68 71 0.95 EXAMPLE 9 Ç GI 32 40 22 2 0 4 0 0.81 2.4 0.91 2.0 4.16 0.0 87 O O 800 1186 17 73 66 1.10 EXAMPLE 10 Ç GA 21 32 39 0 0 7 1 0.82 1.6 1.13 2.7 0.72 23.1 51 O O 908 1196 19 77 78 0.98 EXAMPLE 11 ç GA 17 43 24 0 10 6 0 0.82 1.9 0.78 1.7 1.17 13.4 67 O O 981 1362 13 78 77 1.01 EXAMPLE 12 ç GI 21 39 23 7 □ 8 2 0.91 1.8 0.97 16.9 0.83 9.0 91 O O 1042 1419 14 102 93 1.09 EXAMPLE 13 D GI 16 55 22 0 0 7 0 0.88 1.7 0.87 11.6 0.76 14.1 68 O O 819 1159 16 90 80 1.12 EXAMPLE 14 D GA 17 20 19 0 34 8 2 0.75 2.2 1.10 1.9 2.10 26.9 67 O O 1045 1489 12 79 73 1.08 EXAMPLE 15 D GA 24 40 26 0 0 10 0 0.75 1.6 0.94 5.6 2.07 20.5 66 O O 998 1405 18 92 83 1.10 EXAMPLE 16 D GI 9 23 20 37 0 9 2 0.84 4.3 L6J. 22.1 3.16 30.2 77 O O 1013 1292 5 80 122 0.65 EX. COMPARATIVE 17 AND GI 30 44 16 0 0 7 3 0.77 1.6 1.07 4.9 2.08 18.1 67 O O 629 1042 15 92 88 1.04 EXAMPLE 18 AND GI 13 54 23 1 0 9 0 0.82 1.5 1 01 3.2 2.48 29.8 56 O O 939 1277 11 96 96 1.00 EXAMPLE 19 AND GA 15 54 19 0 0 10 2 0.89 1.8 0.96 1.6 4.15 81.7 51 O O 916 1189 13 95 103 0.92 EXAMPLE 20 AND GI 10 33 24 25 0 7 1 0.89 3.6 0.94 35.1 1.92 35.0 56 O O 1030 1411 9 78 103 0.75 EX.COMPARATIVE 21 F GI 26 44 20 2 0 8 0 0.74 2.4 1.21 2.0 2.06 8.5 50 O O 875 1287 10 71 70 1.01 EXAMPLE 22 F GA 32 34 18 6 0 9 1 0.78 2.4 0.96 11.2 4.17 54.3 69 O O 792 1252 11 97 96 1.01 EXAMPLE 23 F GA 19 43 32 0 0 6 0 0.93 2.0 1.07 14.6 1.08 40.3 53 O O 824 1162 15 89 86 1.03 EXAMPLE 24 F GI 22 35 37 0 0 6 0 0.78 4.3 0.93 7.8 3.55 37.5 75 O O 854 1142 13 58 89 0.65 EX. COMPARATIVE 25 G GI 3 33 22 0 34 7 1 0.89 1.3 1.08 9.8 2.55 78.0 57 O O 1103 1483 9 96 95 1.01 EXAMPLE 26 G GI 36 28 26 0 0 10 0 0.90 2.4 0.87 1.4 5.05 76.9 53 O O 707 1055 18 83 84 0.98 EXAMPLE 27 G GA 30 38 20 0 0 11 1 0.89 2.0 1.04 6.7 1.16 34.4 48 O O 862 1262 14 96 95 1.01 EXAMPLE 28 G GI 22 36 29 0 0 10 3 0.89 3.7 1.24 2.3 1.56 41.3 65 O O 950 1238 15 65 84 0.77 EX. COMPARATIVE 29 H GI 29 32 27 4 0 8 0 0.77 2.1 1.04 3.2 1.14 74.4 36 O O 929 1466 13 91 95 0.95 EXAMPLE 30 H GA 28 40 20 1 0 11 0 0.94 2.0 111 2.3 0.19 22.4 37 O O 851 1275 10 85 78 1.08 EXAMPLE 31 H GA 39 40 13 0 0 6 2 0.88 2.1 1 03 3.5 1.34 51.4 57 O O 809 1291 13 76 80 0.95 EXAMPLE 32 H GI 11 40 38 4 0 7 0 0.89 3.3 1.09 5.1 1.21 79.3 52 O O 916 1264 15 60 82 0.73 EX.COMPARATIVE 33 I GI 7 59 16 5 0 12 1 0.84 1.8 110 10.0 0.88 77.1 43 O O 1004 1263 8 120 115 1.04 EXAMPLE 34 I GI 25 40 20 4 0 10 1 0.77 1.6 0.97 6.3 4.14 141.9 44 O O 796 1209 12 97 105 0.92 EXAMPLE 35 I GA 4 60 20 8 0 8 0 0.86 1.8 1.06 38.4 1.68 66.8 48 O O 1096 1387 10 115 121 0.95 EXAMPLE 36 I GI 16 49 17 7 0 10 1 0.83 3.6 0.78 13.4 2.27 60.0 43 O O 959 1334 8 75 103 0.72 EX. COMPARATIVE 37 J GI 27 32 23 7 0 10 1 0.93 1.8 1.07 1.6 3.81 55.5 65 O O 926 1406 7 75 69 1.08 EXAMPLE 38 J GI 15 40 32 8 0 5 0 0.79 1.3 0.92 2.9 0.87 22.2 58 O O 1104 1439 12 81 86 0.94 EXAMPLE 39 J GA 18 42 31 1 0 8 0 0.80 2.0 0.94 3.3 2.00 20.8 72 O O 1040 1498 15 74 79 0.93 EXAMPLE 40 J GI 19 38 37 1 0 5 0 0.75 X2 1.44 9.7 1.04 29.3 56 O O 889 1169 16 62 85 0.72 EX. COMPARATIVE
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    Petition 870180145531, of 10/29/2018, p. 85/111 [Table 16]
    E E XX E P Μ E P RL 1 O ME NOKL CQ O U M íP M O IN C EO NTAND TI P oINACTION MICROSTRUCTURE COATING LAYER, STEEL SHEET SURFACE LAYER PROPERTY STEEL TYPE STRUCTURAL FRACTION AUSTENITE WITHHELD AVERAGE DISPLACEMENT DENSITY DESCARBURI ZADA LAYER THICKNESS DENSITYOFOXIDE SIZEOFOXIDE A E P X A T E R E N N C C 1THE PEELING OF THE COATING TRACTION PROPERTY COOKING TEMPERABILITY FERRI TA BAINI TA FERRITA BAINÍTI CA MARTENSI TA MARTEN SITA TEMPERADO AUSTENITERETENTION OTHERS QUANTITY OFCARBON IN SOLID SOLUTION INTENT-SITYINX-RAY dCRD) Zd (T D) SCOPE LIMIT TENSION RESISTANCE TOTAL ALONG ZlBH (RD) Z | BH (T D) ZlBH (RD) / ZlBH(TD) % % % % % % % PASTA% 10 l3 / m 2 fl m 10 12 oxides / m 2 nm MPa MPa % MPa MPa 41 K GI 26 50 17 0 0 7 0 0.77 1.7 1.12 8.1 1.27 11.5 80 O O 845 1230 17 85 88 0.96 EXAMPLE 42 K GA 25 48 16 2 0 9 0 0.77 2.1 1.07 19.4 1.05 14.6 59 O O 777 1130 12 96 91 1.05 EXAMPLE 43 K GA 11 32 33 0 14 9 1 0.83 1.6 1.08 2.5 4.68 34.3 81 O O 1112 1410 9 90 90 1.00 EXAMPLE 44 K GI 29 23 13 23 0 9 3 0.73 2.6 162 11.0 1.44 21.9 65 O O 984 1440 7 87 120 0.72 EX.COMPARATIVE 45 L GI 8 38 35 4 0 12 3 0.74 1.7 1.10 1.7 2.13 38.0 53 O O 1168 1466 13 89 102 0.87 EXAMPLE 46 L GI 20 51 240 4 0 0.80 2.4 0.93 3.3 0.77 29.2 41 O O 869 1230 11 71 79 0.89 EXAMPLE 47 L GA 7 53 32 0 0 8 0 0.85 1.5 1.00 28.0 0.66 9.0 55 O O 994 1261 15 118 120 0.98 EXAMPLE 48 L TEST STOP DUE TO FRACTURE OF THE STEEL SHEET IN THE COLD LAMINATION STEP EX. COMPARATIVE 49 M GI 12 59 20 0 0 8 1 0.79 2.0 1.00 9.8 0.58 25.5 58 O O 735 981 16 92 93 0.98 EXAMPLE 50 M GA 26 50 16 0 0 6 2 0.77 2.7 0.96 1.3 2.10 3.8 66 O O 849 1229 18 76 77 0.98 EXAMPLE 51 M GA 11 35 38 4 0 8 4 0.82 1.5 1.24 6.6 1.08 31.2 66 O O 969 1308 15 103 100 1.03 EXAMPLE 52 M GI 75 0 5 13 0 5 2 0.77 1.7 142 4.7 1.70 30.4 67 O O 421 931 15 26 44 (λ5 9 EX.COMPARATIVE 53 N GI 25 24 20 0 20 9 2 0.87 2.0 1.29 2.0 3.54 228.5 37 O O 1086 1464 11 74 71 1.04 EXAMPLE 54 N GA 26 40 260 7 0 0.79 2.2 1.00 4.4 0.58 142.9 28 O O 674 1019 16 73 70 1.04 EXAMPLE 55 N GA 33 33 19 3 0 10 2 0.92 2.4 0.85 2.6 2.79 711.1 32 O O 704 1177 11 85 86 0.98 EXAMPLE 56 N GI 27 34 32 0 □ 7 0 110 1.9 1.00 13.6 2.34 153.4 47 O O 657 1037 20 49 55 0.89 EX.COMPARATIVE 57 O GI 22 33 33 2 0 9 1 0.77 1.8 1.27 1.4 0.76 31.4 61 O O 919 1315 13 72 74 0.97 EXAMPLE 58 O GA 22 36 340 7 0 0.94 1.8 1.12 1.9 2.37 105.3 51 O O 864 1208 13 74 76 0.97 EXAMPLE 59 O GA 15 56 19 3 0 7 0 0.79 1.6 1.03 1.3 1.30 50.1 52 O O 1049 1459 7 84 97 0.86 EXAMPLE 60 O GI 14 38 29 16 0 2 1 0.58 1.9 1.21 5.1 1.82 62.4 55 O O 755 1291 9 40 48 0.83 EX.COMPARATIVE 61 P GI 26 26 26 12 0 10 0 0.89 1.9 1.20 7.5 2.20 34.9 63 O O 936 1397 12 88 87 1.01 EXAMPLE 62 P GI 22 45 15 8 0 9 1 0.87 2.6 1.14 9.3 8.17 24.5 85 O O 998 1392 16 80 69 1.15 EXAMPLE 63 P GA 26 45 20 0 0 9 0 0.94 2.4 0.78 6.1 2.42 36.3 71 O O 710 1046 21 84 82 1.02 EXAMPLE 64 P GI 31 28 27 4 0 9 1 0.74 1.3 ÇL69 5.1 1.47 21.5 74 O O 985 1433 15 77 61 L26 EX. COMPARATIVE 65 Q GI 25 35 12 23 0 4 1 0.78 1.9 0.96 5.6 1.01 19.4 61 O O 897 1350 10 74 71 1.04 EXAMPLE 66 Q GI 21 50 15 2 0 10 2 0.88 2.3 1.28 4.6 2.76 27.2 69 O O 810 1226 15 80 81 0.98 EXAMPLE 67 Q GA 34 44 130 8 0 0.94 2.1 1.14 3.0 0.64 9.6 72 O O 743 1176 9 88 94 0.93 EXAMPLE 68 Q GI 25 37 26 2 0 10 0 0.82 1.4 0T2 3.3 2.11 24.3 57 O O 758 1167 17 93 72 F29 EX. COMPARATIVE 69 R GI 13 49 21 5 0 12 0 0.74 2.1 1.07 23.9 1.62 39.1 55 O O 1153 1506 11 108 114 0.94 EXAMPLE 70 R GA 20 39 290 9 2 0.74 1.9 1.20 2.0 0.90 26.2 57 O O 1019 1298 13 90 84 1.07 EXAMPLE 71 R GA 16 40 35 3 0 6 0 0.76 2.3 1.09 1.8 1.19 84.0 48 O O 1004 1293 11 82 82 1.00 EXAMPLE 72 R GI 10 32 26 28 0 4 0 0.86 1.6 0.96 29.6 2.48 78.9 49 O O 1301 1620 6 84 92 0.91 EXAMPLE 73 s GI 17 27 17 0 27 12 0 0.95 1.8 1.09 2.3 1.66 38.7 64 O O 1311 1568 10 102 95 1.07 EXAMPLE 74 s GA 16 34 33 2 0 13 2 0.88 1.9 0.97 2.6 5.35 38.3 83 O O 877 1178 13 92 94 0.97 EXAMPLE 75 s GA 9 43 30 6 0 11 1 0.87 1.6 1.01 4.8 0.42 41.7 48 O O 971 1197 14 105 103 1.01 EXAMPLE 76 s GI 33 19 15 23 0 6 4 0.84 1.8 0.91 1.7 4.19 111.4 57 O O 799 1235 10 82 82 1.00 EXAMPLE 77 T GI 17 38 30 2 0 10 3 0.73 1.9 0.97 1.9 0.84 11.2 75 O O 884 1257 11 79 86 0.91 EXAMPLE 78 T GA 15 63 5 9 0 8 0 0.82 2.0 1.19 3.9 2.09 24.4 75 O O 997 1373 13 92 85 1.08 EXAMPLE 79 T GA 18 54 17 2 0 9 0 0.82 1.7 1.15 6.4 1.71 44.1 56 O O 866 1203 18 103 106 0.97 EXAMPLE 80 T GI 21 40 16 13 0 9 1 0.76 1.7 0.86 2.5 1.19 40.5 47 O O 1089 1514 15 88 91 0.96 EXAMPLE
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    Petition 870180145531, of 10/29/2018, p. 86/111 [Table 17]
    E E XX E PΜ E P RL 1The ME NSUCH C Q O U M I P M O I N C E O N T E TypeINACTION MICROSTRUCTURE COATING LAYER. □ LAYER AND STEEL SHEET SURFACE PROPERTY STEEL TYPE STRUCTURAL FRACTION AUSTENITE WITHHELD AVERAGE DISPLACEMENT DENSITY DESCARBURI ZADA LAYER THICKNESS DENSITYOFOXY OF SIZEOFOXIDE A E P X A T R E Ê R N N C A ITHE DRYING OF THE COATING TRACTION PROPERTY COOKING TEMPERABILITY FERRI TA BAINI TA FERRITA BAINÍTI CA MARTENSI TA MARTEN SITA TEMPERADO AUSTENITERETENTION OTHERS QUANTITY OF CARUUNU IN SOLID SOLUTION INTENT-SITYINX-RAY d (RD)/ d (TD) SCOPE LIMIT TENSION RESISTANCE TOTAL ALONG ZlBH (RD) Z | BH (T D) ^ dBH(rd; / ZlBH(TD) % % % % % % % PASTA% ΙΟ'Χη-. 2 fj. m 10 12 oxides / m 2 nm MPa MPa % MPa MPa 81 U GI 8 35 35 8 1 11 2 0.92 1.4 0.80 12.2 0.35 16.5 70 O O 1092 1361 13 123 110 1.11 EXAMPLE 82 u GA 20 45 30 1 0 4 0 0.80 1.6 0.88 22.1 1 54 29.8 70 O O 868 1158 17 91 100 0.91 EXAMPLE 83 u GA 20 20 16 0 32 11 1 0.76 2.1 1.12 13.1 0.73 5.4 51 O O 1203 1519 9 102 115 0.88 EXAMPLE 84 u GI 11 50 26 4 0 9 0 0.79 1.4 0.82 12.2 1 53 45.8 55 O O 1189 1547 10 123 125 0.98 EXAMPLE 85 V GI 17 33 13 27 0 10 0 0.83 2.2 1.15 2.1 1.06 17 7 80 O O 1152 1589 9 88 80 1.10 EXAMPLE 86 V GI 32 32 30 1 0 5 0 0.84 2.2 1.04 6.9 1.39 41.9 62 O O 937 1358 1 1 71 69 1.02 EXAMPLE 87 V GA 36 28 24 3 0 7 2 0.90 2.8 0.87 2.4 0.78 21.0 64 O O 952 1372 10 74 73 1.01 EXAMPLE 88 V GI 17 50 22 2 0 9 0 0.87 1.7 1.13 1.3 1.52 19.5 76 O O 1020 1318 15 81 77 1.05 EXAMPLE 89 w GI 22 37 34 1 0 6 0 0.83 1.7 1.01 1.4 3.31 17 7 75 O O 862 1188 20 82 72 1.13 EXAMPLE 90 w GI 20 40 34 1 0 5 Q 0.91 2.2 1.14 3.9 0.79 12.1 68 O O 950 1324 13 72 79 0.91 EXAMPLE 91 w GA 18 30 39 2 0 10 1 0.76 2.6 1.16 3.4 2.64 23.7 67 O O 907 1295 14 81 88 0.92 EXAMPLE 92 w GI 25 40 28 0 0 7 0 0.91 1.7 1.12 3.1 1 25 114 79 O O 694 1007 29 90 84 1.07 EXAMPLE 93 X GI 9 26 49 5 0 9 2 0.77 1.9 0.79 5.4 1.42 40.5 48 O O 1170 1489 12 99 90 1.10 EXAMPLE 94 X GI 21 33 34 5 0 7 0 0.82 1.5 1.04 12.7 2.05 20.1 77 O O 813 1194 12 107 102 1.04 EXAMPLE 95 X GA 14 45 31 2 0 7 1 0.88 2.1 0.90 15.9 1.11 29.0 52 O O 1011 1342 9 87 79 1.10 EXAMPLE 96 X GI 20 47 15 9 0 9 0 0.75 1.8 0.79 4.1 1.58 21.3 67 O O 1004 1388 12 100 86 1.16 EXAMPLE 97 Y GI 29 39 20 4 0 8 0 0.77 1.8 0.94 7.1 235 72.9 52 O O 898 1401 16 88 85 1.03 EXAMPLE 98 Y GI 19 48 19 5 0 8 1 0.75 1.9 0.96 6.4 113 256.1 33 O O 931 1263 16 96 94 1.02 EXAMPLE 99 Y GA 29 20 19 26 0 6 0 0.74 2.4 0.85 12.3 2.70 158.9 47 O O 1013 1578 8 84 86 0.97 EXAMPLE 100 Y GI 20 46 20 2 0 9 3 0.91 2.0 0.96 6.9 0.38 59.4 46 O O 917 1284 15 100 106 0.94 EXAMPLE 101 z GI 29 40 21 3 0 7 0 0.79 1.9 1.07 4.1 2.25 13.3 75 O O 1002 1494 1 1 77 89 0.86 EXAMPLE 102 z GA 18 65 5 4 0 8 0 0.73 2.4 1.27 9.6 0.60 13.1 58 O O 1087 1594 9 83 79 1.05 EXAMPLE 103 z GA 0 65 18 5 0 9 3 0.90 1.4 0.79 2.0 2.65 20.8 78 O O 1057 1283 10 102 92 1.10 EXAMPLE 104 z GI 19 27 24 15 0 12 3 0.75 2.0 1.10 1.2 0.58 18.2 62 O O 1232 1665 10 83 79 1.05 EXAMPLE 105 AA GI 16 37 34 3 0 10 0 0.87 2.3 0.94 10.3 200 31.1 69 O O 1024 1371 13 101 90 1.12 EXAMPLE 106 AA GA 25 39 20 6 0 8 2 0.79 1.9 0.86 24.2 2.72 97.9 48 O O 1063 1253 10 108 129 0.83 EXAMPLE 107 AA GA 12 11 31 0 38 7 1 0.78 1.7 1.20 1.2 2.94 88.3 54 O O 1348 1578 13 73 71 1.02 EXAMPLE 108 AA GI 16 42 29 4 0 9 0 0.83 1.6 0.88 1.3 0.92 24.4 63 O O 1010 1356 14 79 74 1.06 EXAMPLE 109 AB GI 32 38 24 0 0 6 0 0.77 2.0 0.96 7.4 4.00 43.3 78 O O 647 1049 20 74 77 0.96 EXAMPLE 110 AB GA 15 45 34 0 0 6 0 0.79 2.0 1.18 42.2 2.21 62.1 53 O O 733 984 19 95 106 0.89 EXAMPLE 111 AB GA 11 34 37 3 0 14 1 0.79 2.0 0.87 1.9 2.72 63.3 51 O O 993 1283 15 101 104 0.97 EXAMPLE 112 AB GI 13 48 21 7 0 11 0 0.83 2.0 1.09 22.1 2.58 77.1 51 O O 882 1217 1 1 121 114 1.06 EXAMPLE 113 B.C GI 20 27 10 32 0 8 3 0.88 2.2 1.09 5.0 1 96 33.5 67 O O 1214 1573 5 77 85 0.90 EXAMPLE 114 B.C GI 17 48 22 0 0 11 2 0.94 2.1 1.09 3.6 2.33 67.0 60 O O 1000 1336 14 82 91 0.90 EXAMPLE 115 B.C GA 16 37 34 5 0 8 0 0.92 1.9 1.12 7.5 1.85 66.4 57 O O 1042 1293 10 91 89 1.02 EXAMPLE 116 B.C GI 12 17 14 49 0 8 0 0.77 1.3 1.09 15.5 4 14 107.5 53 O O 1383 1823 9 108 96 1.12 EXAMPLE 117 AD GI 11 38 33 10 0 8 0 0.85 1.8 1.04 2.2 0.85 40.9 45 O O 1180 1566 12 89 84 1.05 EXAMPLE 118 AD GA 27 25 21 17 0 7 3 0.89 2.2 1.21 4.0 3.74 74.9 68 O O 965 1434 1 1 89 87 1.02 EXAMPLE 119 AD GA 11 25 18 36 0 9 1 0.72 1.6 0.96 2.3 1 08 84.8 53 O O 1225 1617 7 88 83 1.06 EXAMPLE 120 AD GI 13 40 31 7 0 9 0 0.83 2.4 0.96 1.7 1.75 51.3 62 O O 911 1260 1 1 87 92 0.94 EXAMPLE
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    Petition 870180145531, of 10/29/2018, p. 87/111 [Table 18]
    E E XX E P Μ EP R L I 0 ME N T AL CQ OR M í P M 0 I N C EO N T E TI P 0DANDA ç 0 MICROSTRUCTURE COATING LAYER, STEEL SHEET SURFACE LAYER PROPERTY STEEL TYPE STRUCTURAL FRACTION AUSTENITE WITHHELD AVERAGE DISPLACEMENT DENSITY DESCARBURI ZADA LAYER THICKNESS DENSITYOFOXIDE SIZEOFOXIDE A E P X A T R E Ê R N N C A ITHE PEELING OF THE COATING TRACTION PROPERTY COOKING TEMPERABILITY FERRI TA BAINI TA FERRITA BAINÍTI CA MARTENSI TA MARTEN SITA TEMPERADO AUSTENITERETENTION OTHERS AMOUNT OF CARBON IN SOLID SOLUTION INTENT-SITYINX-RAY dCRD) / d (T D) SCOPE LIMIT TENSION RESISTANCE TOTAL ALONG ZlBH (RD) ZlBH (T D) Z1BH (RD) ZZlBH(TD) % % % % % % % PASTA% 10'Vm 2 fl m 10 12 oxides / m 2 nm MPa MPa % MPa MPa 121 AE GI 16 48 23 12 0 0 1 0.72 1.9 1.10 32.2 1.72 81.0 41 O O 535 815 15 45 47 0.95 EX.COMPARATIVE 122 AF GI 14 16 6 47 0 15 2 0.79 1.9 0.89 2.3 2.10 110.0 38 O O 1326 2187 4 184 157 1.17 EX.COMPARATIVE 123 AG GI 23 43 28 0 0 0 6 0.77 1.7 0.90 16.8 1.67 16.9 79 O O 385 703 18 34 32 1.06 EX. COMPARATIVE 124 AH - TEST STOP DUE TO FRACTURE IN THE COLD LAMINATION STEP EX. COMPARATIVE 125 THERE GA 35 34 13 3 0 O 15 - - - 1.3 1.84 3.1 63 O O 497 275 14 66 72 0.92 EX. COMPARATIVE 126 AJ - TEST STOP DUE TO FRACTURE OF THE PLATE EX. COMPARATIVE 127 AK - TEST STOP DUE TO FRACTURE IN THE WELDING ZONE IN THE CONTINUOUS STEPPING STEP EX. COMPARATIVE 128 G GA 44 13 25 6 0 12 0 0.93 2.6 1.48 6.6 2.11 17.1 67 O O 595 978 22 64 87 0.74 EX. COMPARATIVE 129 G GA 41 16 21 6 0 15 1 0.87 15 1.08 13.2 1.80 21.3 83 O O 625 1005 24 53 80 0.66 EX. COMPARATIVE 130 G GA 41 6 38 2 0 11 2 0.90 12 1.37 11.9 3.05 19.3 58 O O 714 1106 21 72 102 0.71 EX. COMPARATIVE 131 V GA 21 0 16 4 0 8 1 0.83 2.1 1.06 18 3.00 36.3 72 O O 621 1193 23 39 36 1.09 EX. COMPARATIVE 132 V GA 37 22 25 3 0 2 11 0.48 2.2 0.94 2.6 1.62 26.3 38 O O 491 789 14 52 45 1.16 EX. COMPARATIVE 133 B GA 26 18 45 4 1 6 0 0.87 1.7 1.01 2.8 10.0 - - O X 682 1085 23 88 93 0.95 EX. COMPARATIVE 134 B GA 37 30 21 2 1 8 1 0.81 1.9 1.07 4.1 23.5 34.0 55 O O 585 972 20 78 82 0.95 EX. COMPARATIVE 135 0 GA 17 29 33 8 0 11 2 0.91 2.1 1.15 97 1.17 11 84 O X 919 1190 15 84 84 1.00 EX. COMPARATIVE 136 0 GA 26 23 35 5 0 7 4 0.87 2.6 1.08 68 14.2 57.6 73 O O 864 1208 13 74 65 1.14 EX. COMPARATIVE 137 D GA RESULTS OF THE SIGNIFICANTLY DETERIOR EXTERNAL APPEARANCE ASSESSMENT, AND MICROSTRUCTURE ASSESSMENT AND PROPERTY ASSESSMENT ARE NOT PERFORMED X - EX. COMPARATIVE
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    Petition 870180145531, of 10/29/2018, p. 88/111
    82/82 [00240] As shown in Tables 1 to 18, in the examples, excellent hardenability is obtained. On the other hand, in the comparative examples, it is impossible to obtain sufficient tensile strength and hardenability.
    INDUSTRIAL APPLICABILITY [00241] In the high-strength hot-dip galvanized steel sheet and in the high-strength alloy hot-dip galvanized steel sheet, according to the present invention, it is possible to ensure the quantity of hardenability significantly and obtain isotropic hardenability, and therefore it is possible to greatly improve hardenability in addition to improving strength and ductility.
    权利要求:
    Claims (22)
    [1]
    1. High-strength hot-dip galvanized steel sheet, characterized by the fact that it consists of:
    a base steel plate consisting of, by weight%:
    C: 0.075 to 0.400%,
    Si: 0.01 to 2.00%,
    Mn: 0.80 to 3.50%,
    P: 0.0001 to 0.100%,
    S: 0.0001 to 0.0100%,
    Al: 0.001 to 2.00%,
    N: 0.0001 to 0.0100%,
    O: 0.0001 to 0.0100%, and optionally
    Ti: 0.001 to 0.150%,
    Nb: 0.001 to 0.100%,
    V: 0.001 to 0.300%,
    Mo: 0.01 to 2.00%,
    W: 0.01 to 2.00%,
    Cr: 0.01 to 2.00%,
    Ni: 0.01 to 2.00%,
    Cu: 0.01 to 2.00%,
    B: 0.0001 to 0.0100%, and
    Ca, Ce, Mg, Zr, La, and REM 0.0001 at 0.0100% as a total, with the rest composed of Fe and unavoidable impurities, and a structure of the base steel plate contains, in volume fraction, 3% or more of a residual austenite phase with the rest contained and 50% or less of a ferrite phase, and 40% or more of a hard phase for the total, where an average discrepancy density is 1.0 x 10 13 / m 2 or more, in a 1/8 thick strip centered around a 1/4 sheet thickness of a surface to 3/8 thickness
    Petition 870180145531, of 10/29/2018, p. 90/111
    [2]
    2/17 centered around the plate thickness 1/4 from the surface in the base steel plate, with an amount of solid solution C contained in the residual austenite phase being, by weight%, 0.70 to 1.00 %, where a random FCC iron X-ray intensity ratio in a residual austenite phase texture is 3.0 or less, with a ratio between a grain diameter relative to a rolling direction, and a diameter of grain relative to a direction of the plate width of the residual austenite phase is 0.75 to 1.33, and additionally, a hot dip galvanized layer is formed on the surface of the base steel plate, and the thickness of the plate is 0.6 to 5.0 mm.
    2. High-strength hot-dip galvanized steel sheet according to claim 1, characterized by the fact that the hard phase is composed of a bainitic ferrite phase and / or a bainite phase, a tempered martensite phase , and a fresh martensite phase.
    [3]
    3. High-strength hot-dip galvanized steel sheet according to claim 1 or 2, characterized in that a thickness of the decarbonized layer formed in the surface layer portion of the base steel sheet is adjusted to be within from a range of 0.01 mm to 10.0 mm, an average grain diameter of finely dispersed oxides in the decarbonized layer is 500 nm or less, and an average density of the oxides in the decarbonized layer is within a range of 1.0 x 10 12 oxides / m 2 or more.
    [4]
    4. High-strength hot-dip galvanized steel sheet according to any of claims 1 to 3, characterized by the fact that an alloy treatment is
    Petition 870180145531, of 10/29/2018, p. 91/111
    3/17 made in the hot-dip galvanized layer formed on the surface of the base steel plate.
    [5]
    5. High-strength hot-dip galvanized steel sheet according to any one of claims 1 to 4, characterized in that the structure contains, in fraction of volume, 3% or more of residual austenite phase, 50% or less of ferrite phase, with the rest contained and 40% or more for the total of a hard phase, in the thickness range 1/8 centered around the plate thickness 1/4 of the surface to thickness 3/8 centered around plate thickness 1/4 from the surface on the base steel plate.
    [6]
    6. Method for producing high-strength hot-dip galvanized steel sheet, as defined in any one of claims 1 to 5, characterized by the fact that it comprises:
    a heating step of heating a base steel plate consisting of, by mass%:
    C: 0.075 to 0.400%,
    Si: 0.01 to 2.00%,
    Mn: 0.80 to 3.50%,
    P: 0.0001 to 0.100%,
    S: 0.0001 to 0.0100%,
    Al: 0.001 to 2.00%,
    N: 0.0001 to 0.0100%,
    O: 0.0001 to 0.0100%, and optionally
    Ti: 0.001 to 0.150%,
    Nb: 0.001 to 0.100%,
    V: 0.001 to 0.300%,
    Mo: 0.01 to 2.00%,
    W: 0.01 to 2.00%,
    Cr: 0.01 to 2.00%,
    Ni: 0.01 to 2.00%,
    Petition 870180145531, of 10/29/2018, p. 92/111
    4/17
    Cu: 0.01 to 2.00%,
    B: 0.0001 to 0.0100%, and
    Ca, Ce, Mg, Zr, La, and REM to 0.0001 at 0.0100% as a total, with the remainder of Fe and unavoidable impurities, up to 1180 ° C or more;
    a hot rolling step of carrying out hot rolling by plural passes, so that a relationship between a “T” temperature of a hot rolled steel sheet, within a range of 1050 ° C to a finishing temperature of lamination, a sheet thickness “h”, and an elapsed time “t” between each pass satisfies Numeric Expression 1 after the heating step, in which a hot rolling finish temperature is in a temperature range of 880 ° C or more;
    a first cooling step of cooling the hot-rolled steel plate, in which cooling starts 1.0 second or more after the hot rolling step is complete, and cooling is stopped at 450 ° C or more;
    a second cooling step of additional cooling of the hot rolled steel sheet to 400 ° C after the first cooling step, in which a time elapsed from the completion of the first cooling step to a point when the hot rolled steel sheet is cooled to 400 ° C is 1.0 hour or more;
    a cold rolling step of cold rolling with a total reduction ratio of 30 to 75% after the second cooling step;
    a continuous annealing annealing step at a maximum heating temperature of (Ac 3 - 50) ° C or more after the cold rolling step to obtain an annealed steel sheet;
    a third cooling step of plate cooling
    Petition 870180145531, of 10/29/2018, p. 93/111
    5/17 steel annealed over a range of 740 ° C to 500 ° C, with an average cooling rate of 1.0 ° C / second or more to obtain a chilled steel sheet after the continuous annealing step; and a bainite transformation step, including a coating step of forming a hot dip galvanized layer on a surface of the steel sheet cooled by immersing the steel sheet cooled inside a galvanizing bath, in order to obtain a coated steel sheet, in which the cooled steel sheet is kept at a temperature within a range of 300 to 470 ° C for 20 to 1000 seconds including a period of time during which it is being immersed in the galvanized bath, for cause a transformation of bainite in the cooled steel plate after the third cooling step, [Numerical Expression 1] where “N” represents a total number of passes from the start of hot rolling to completion, “i” represents a order of each pass, “Ti” represents a rolling temperature (° C) in pass i a , “hi” represents a plate thickness (mm) after processing pass ia, “ti” re it shows a time elapsed from the passage going to the next passage, and when i = 1, h0 = a thickness of the plate; and where an elapsed time from one final pass to the next pass is a time elapsed from the final pass to the start time of cooling after the completion of the hot rolling.
    [7]
    7. Method according to claim 6,
    Petition 870180145531, of 10/29/2018, p. 94/111
    6/17 characterized by the fact that in the coating stage, oxides are generated in a portion of the annealed steel sheet surface layer in a preheating zone where an air ratio, being a ratio between a volume of air contained in the gas mixed in a unit volume in the mixed gas of air and combustible gas, used for heating, and a volume of air theoretically required to enable complete combustion of the combustible gas contained in the gas mixed in a unit volume, is adjusted to 0.7 to 1, 2, the oxides are subsequently reduced in a reduction zone where a partial pressure ratio (P (H 2 O) / P (H 2 )) between H 2 O and H 2 is adjusted to be 0.0001 to 2.0 , and then, the annealed steel sheet is immersed inside the galvanizing bath under a condition where a coating bath temperature is 450 to 470 ° C, a temperature of the steel sheet when entering the coating bath is 430 at 490 ° C, and an effective amount of Al n the coating bath is 0.01 to 0.18% by mass, in order to form the hot dip galvanized layer on the surface of the annealed steel sheet.
    [8]
    8. Method, according to claim 6, characterized by the fact that it also comprises:
    a tempering lamination step of carrying out a lamination of the coated steel sheet with a reduction ratio of 5.00% or less, after the coating step is completed and the transformation of the bainite is caused.
    [9]
    9. Method of producing a hot-dip galvanized steel sheet with high-strength alloy, characterized by the fact that it comprises:
    connect the hot dip galvanized layer after the high strength hot dip galvanized steel sheet is produced by the production method as defined in any one
    Petition 870180145531, of 10/29/2018, p. 95/111
    7/17 of claims 6 to 8.
    [10]
    10. Method, according to claim 9, characterized by the fact that it also comprises:
    a tempering lamination step of carrying out a lamination for the high-strength hot-dip galvanized steel sheet with a reduction ratio of 5.00% or less after the hot-dip galvanized layer is bonded.
    [11]
    11. Method of production of high-strength hot-dip galvanized steel sheet, as defined in any one of claims 1 to 5, characterized by the fact that it comprises:
    a heating step of heating a base steel plate consisting of, by mass%:
    C: 0.075 to 0.400%,
    Si: 0.01 to 2.00%,
    Mn: 0.80 to 3.50%,
    P: 0.0001 to 0.100%,
    S: 0.0001 to 0.0100%,
    Al: 0.001 to 2.00%,
    N: 0.0001 to 0.0100%,
    O: 0.0001 to 0.0100%, and optionally
    Ti: 0.001 to 0.150%,
    Nb: 0.001 to 0.100%,
    V: 0.001 to 0.300%,
    Mo: 0.01 to 2.00%,
    W: 0.01 to 2.00%,
    Cr: 0.01 to 2.00%,
    Ni: 0.01 to 2.00%,
    Cu: 0.01 to 2.00%,
    B: 0.0001 to 0.0100%, and
    Ca, Ce, Mg, Zr, La, and REM to 0.0001 at 0.0100% as a
    Petition 870180145531, of 10/29/2018, p. 96/111
    8/17 total, with the remainder of Fe and unavoidable impurities, up to 1180 ° C or more;
    a hot rolling step of carrying out hot rolling by plural passes, so that a relationship between a “T” temperature of a hot rolled steel sheet, within a range of 1050 ° C to a finishing temperature of lamination, a sheet thickness “h”, and an elapsed time “t” between each pass satisfies Numeric Expression 1 after the heating step, in which a hot rolling finish temperature is in a temperature range of 880 ° C or more;
    a first cooling step of cooling the hot-rolled steel plate, in which cooling starts 1.0 second or more after the hot rolling step is complete, and cooling is stopped at 450 ° C or more;
    a second cooling step of additional cooling of the hot rolled steel sheet to 400 ° C after the first cooling step, in which a time elapsed from the completion of the first cooling step to a point when the hot rolled steel sheet is cooled to 400 ° C is 1.0 hour or more;
    a cold rolling step of cold rolling with a total reduction ratio of 30 to 75% after the second cooling step;
    a continuous annealing annealing step at a maximum heating temperature of (Ac 3 - 50) ° C or more after the cold rolling step to obtain an annealed steel sheet;
    a third cooling step for cooling the annealed steel sheet to a range of 740 ° C to 500 ° C, at an average cooling rate of 1.0 ° C / second or more to obtain a cooled steel sheet, after the continuous annealing step;
    Petition 870180145531, of 10/29/2018, p. 97/111
    9/17 a bainite transformation step of maintaining the steel sheet cooled to a temperature within a range of 300 to 470 ° C for 20 to 1000 seconds, after the third cooling step, to cause a bainite transformation in the sheet chilled steel; and a coating step of forming a hot-dip galvanized layer on a surface of the cooled steel sheet by immersing the cooled steel sheet into a galvanizing bath, after the bainite transformation step, [Numerical Expression 1] where "N" represents a total number of passes from the start of hot rolling to completion, "i" represents an order of each pass, "Ti" represents a rolling temperature (° C) in passage i a , "Hi" represents a thickness of the plate (mm) after processing the passage ia, "ti" represents a time elapsed from passage ia to the next passage, and when i = 1, h0 = a thickness of the plate; and where an elapsed time from one final pass to the next pass is a time elapsed from the final pass to the start time of cooling after the completion of the hot rolling.
    [12]
    12. Method, according to claim 11, characterized by the fact that, in the coating step, oxides are generated in a portion of the annealed steel sheet surface layer in a preheating zone where an air ratio, being an ratio of a volume of air contained in the gas mixed to a unit volume in the gas
    Petition 870180145531, of 10/29/2018, p. 98/111
    10/17 mixed air and fuel gas, used for heating, and a volume of air theoretically required to enable complete combustion of the fuel gas contained in the gas mixed in a unit volume, is adjusted to 0.7 to 1.2, subsequently oxides are reduced in a reduction zone where a partial pressure ratio (P (H 2 O) / P (H 2 )) between H 2 O and H 2 is adjusted to be 0.0001 to 2.0, and then , the annealed steel sheet is immersed inside the galvanizing bath under a condition where a coating bath temperature is 450 to 470 ° C, a temperature of the steel sheet when entering the coating bath is 430 to 490 ° C , and an effective amount of Al in the coating bath is 0.01 to 0.18% by mass, to thereby form the hot dip galvanized layer on the surface of the annealed steel sheet.
    [13]
    13. Method, according to claim 11, characterized by the fact that it further comprises:
    a tempering lamination step of carrying out a lamination for the coated steel sheet with a reduction ratio of 5.00% or less, after the coating step is completed.
    [14]
    14. Production method of hot-dip galvanized steel sheet with high-strength alloy, characterized by the fact that it comprises:
    bonding the hot dip galvanized layer after the high strength hot dip galvanized steel sheet is produced by the production method as defined in claim 11.
    [15]
    15. Method, according to claim 14, characterized by the fact that it also comprises:
    a tempering lamination step of carrying out a lamination for the high-strength hot-dip galvanized steel sheet with a reduction ratio of 5.00% or less after the hot-dip galvanized layer is bonded.
    Petition 870180145531, of 10/29/2018, p. 99/111
    11/17
    [16]
    16. Production method of high-strength hot-dip galvanized steel sheet, as defined in any one of claims 1 to 5, characterized by the fact that it comprises:
    a heating step of heating a base steel plate consisting of, by mass%:
    C: 0.075 to 0.400%,
    Si: 0.01 to 2.00%,
    Mn: 0.80 to 3.50%,
    P: 0.0001 to 0.100%,
    S: 0.0001 to 0.0100%,
    Al: 0.001 to 2.00%,
    N: 0.0001 to 0.0100%,
    O: 0.0001 to 0.0100%, and optionally
    Ti: 0.001 to 0.150%,
    Nb: 0.001 to 0.100%,
    V: 0.001 to 0.300%,
    Mo: 0.01 to 2.00%,
    W: 0.01 to 2.00%,
    Cr: 0.01 to 2.00%,
    Ni: 0.01 to 2.00%,
    Cu: 0.01 to 2.00%,
    B: 0.0001 to 0.0100%, and
    Ca, Ce, Mg, Zr, La, and REM to 0.0001 at 0.0100% as a total, with the remainder of Fe and unavoidable impurities, up to 1180 ° C or more;
    a hot rolling step of carrying out hot rolling by plural passes, so that a relationship between a “T” temperature of a hot rolled steel sheet, within a range of 1050 ° C to a finishing temperature of
    Petition 870180145531, of 10/29/2018, p. 100/111
    12/17 lamination, a sheet thickness “h”, and an elapsed time “t” between each pass satisfy Numerical Expression 1 after the heating step, in which a hot rolling finish temperature is in a temperature range 880 ° C or more;
    a first cooling step of cooling the hot-rolled steel plate, in which cooling starts 1.0 second or more after the hot rolling step is complete, and cooling is stopped at 450 ° C or more;
    a second cooling step of additional cooling of the hot rolled steel sheet to 400 ° C after the first cooling step, in which a time elapsed from the completion of the first cooling step to a point when the hot rolled steel sheet is cooled to 400 ° C is 1.0 hour or more;
    a cold rolling step of cold rolling with a total reduction ratio of 30 to 75% after the second cooling step;
    a continuous annealing step of annealing at a maximum heating temperature of (Ac3 - 50) ° C or more after the cold rolling step to obtain an annealed steel sheet;
    a third cooling step for cooling the annealed steel sheet to a range of 740 ° C to 500 ° C, at an average cooling rate of 1.0 ° C / second or more to obtain a cooled steel sheet, after the continuous annealing step;
    a coating step of forming a hot-dip galvanized layer on a surface of the cooled steel sheet by immersing the cooled steel sheet inside a galvanizing bath, after the third cooling step, to obtain a steel sheet coated; and a bainite transformation step to maintain the steel sheet cooled to a temperature within a range of 300
    Petition 870180145531, of 10/29/2018, p. 101/111
    13/17 at 470 ° C for 20 to 1000 seconds, after the coating step, to cause a transformation of bainite in the coated steel sheet, [Numerical Expression 1] where “N” represents a total number of passes from the hot rolling start to completion, “i” represents an order of each pass, “Ti” represents a rolling temperature (° C) in pass i a , “hi” represents a sheet thickness (mm) after processing from passage ia, “ti” represents a time elapsed from passage ia to the next passage, and when i = 1, h0 = a thickness of the plate; and where an elapsed time from one final pass to the next pass is a time elapsed from the final pass to the start time of cooling after the completion of the hot rolling.
    [17]
    17. Method, according to claim 16, characterized by the fact that, in the coating step, oxides are generated in a portion of the annealed steel sheet surface layer in a preheating zone where an air ratio, being an ratio between a volume of air contained in the gas mixed in a unit volume in the mixed gas of air and fuel gas, used for heating, and a volume of air theoretically required to enable complete combustion of the fuel gas contained in the gas mixed in a unit volume, is adjusted to 0.7 to 1.2, subsequently the oxides are reduced in a reduction zone where a partial pressure ratio (P (H2Ü) / P (H2)) between H2O and H2 is adjusted to be 0.0001 a 2.0, and in
    Petition 870180145531, of 10/29/2018, p. 102/111
    14/17 Then, the annealed steel sheet is immersed inside the galvanizing bath under a condition in which a coating bath temperature is 450 to 470 ° C, a temperature of the steel sheet when entering the coating bath is 430 at 490 ° C, and an effective amount of Al in the coating bath is 0.01 to 0.18% by mass, to thereby form the hot dip galvanized layer on the surface of the annealed steel sheet.
    [18]
    18. Method, according to claim 16, characterized by the fact that it also comprises:
    a tempering lamination step of carrying out a lamination for the coated steel sheet with a reduction ratio of 5.00% or less, after the bainite transformation step is caused.
    [19]
    19. Production method of hot-dip galvanized steel sheet with high-strength alloy, excellent in hardenability, characterized by the fact that it comprises:
    bonding the hot dip galvanized layer after the high strength hot dip galvanized steel sheet is produced by the production method as defined in claim 16.
    [20]
    20. Method, according to claim 19, characterized by the fact that it also comprises:
    a tempering lamination step to perform a lamination for high strength hot dip galvanized steel sheet with a reduction ratio of 5.00% or less after the alloying step.
    [21]
    21. Production method of high-strength hot-dip galvanized steel sheet, as defined in claim 4, characterized by the fact that it comprises:
    a heating step of heating a base steel plate consisting of, by mass%:
    Petition 870180145531, of 10/29/2018, p. 103/111
    15/17
    C: 0.075 to 0.400%,
    Si: 0.01 to 2.00%,
    Mn: 0.80 to 3.50%,
    P: 0.0001 to 0.100%,
    S: 0.0001 to 0.0100%,
    Al: 0.001 to 2.00%,
    N: 0.0001 to 0.0100%,
    O: 0.0001 to 0.0100%, and optionally
    Ti: 0.001 to 0.150%,
    Nb: 0.001 to 0.100%,
    V: 0.001 to 0.300%,
    Mo: 0.01 to 2.00%,
    W: 0.01 to 2.00%,
    Cr: 0.01 to 2.00%,
    Ni: 0.01 to 2.00%,
    Cu: 0.01 to 2.00%,
    B: 0.0001 to 0.0100%, and
    Ca, Ce, Mg, Zr, La, and REM to 0.0001 at 0.0100% as a total, with the remainder of Fe and unavoidable impurities, up to 1180 ° C or more;
    a hot rolling step of carrying out hot rolling by plural passes, so that a relationship between a “T” temperature of a hot rolled steel sheet, within a range of 1050 ° C to a finishing temperature of lamination, a sheet thickness "h", and an elapsed time "t" between each pass satisfies Numeric Expression 1 after the heating step, in which a hot rolling finish temperature is in a temperature range of 880 ° C or more;
    a first cooling step of cooling the
    Petition 870180145531, of 10/29/2018, p. 104/111
    16/17 hot rolled steel plate, where cooling starts 1.0 second or more after completing the hot rolling step, and cooling stops at 450 ° C or more;
    a second cooling step of additional cooling of the hot rolled steel sheet to 400 ° C after the first cooling step, in which a time elapsed from the completion of the first cooling step to a point when the hot rolled steel sheet is cooled to 400 ° C is 1.0 hour or more;
    a cold rolling step of cold rolling with a total reduction ratio of 30 to 75% after the second cooling step;
    a continuous annealing annealing step at a maximum heating temperature of (Ac 3 - 50) ° C or more after the cold rolling step to obtain an annealed steel sheet;
    a third cooling step for cooling the annealed steel sheet to a range of 740 ° C to 500 ° C, at an average cooling rate of 1.0 ° C / second or more to obtain a cooled steel sheet, after the continuous annealing step;
    a coating step of forming a hot-dip galvanized layer on a surface of the annealed steel sheet by immersing the annealed steel sheet inside a galvanizing bath, after the third cooling step, to obtain a steel sheet coated;
    an alloying step of the hot dip galvanized layer;
    a bainite transformation step of maintaining the steel sheet cooled to a temperature within a range of 300 to 470 ° C for 20 to 1000 seconds, after the alloying step, to cause a bainite transformation in the coated steel sheet, [Numeric Expression 1]
    Petition 870180145531, of 10/29/2018, p. 105/111
    17/17 where "N" represents a total number of passes from the start of hot rolling to completion, "i" represents an order of each pass, "Ti" represents a rolling temperature (° C) in the pass i a , “hi” represents a plate thickness (mm) after processing the passage ia, “ti” represents a time elapsed from passage ia to the next passage, and when i = 1, ho = a thickness of the plate ; and where an elapsed time from one final pass to the next pass is a time elapsed from the final pass to the start time of cooling after the completion of the hot rolling.
    [22]
    22. Method, according to claim 21, characterized by the fact that it further comprises:
    a tempering lamination step to carry out the lamination of the coated steel sheet with a reduction ratio of 5.00% or less after the bainite transformation step.
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    同族专利:
    公开号 | 公开日
    WO2013047821A1|2013-04-04|
    EP2762582A4|2015-12-02|
    JP5413539B2|2014-02-12|
    JPWO2013047821A1|2015-03-30|
    US20140234660A1|2014-08-21|
    BR112014007498A2|2017-04-04|
    ZA201402352B|2016-01-27|
    RU2014117645A|2015-11-10|
    CN103842541A|2014-06-04|
    CA2850340C|2016-10-18|
    MX2014003718A|2014-07-14|
    KR20140052072A|2014-05-02|
    TW201329251A|2013-07-16|
    TWI507538B|2015-11-11|
    EP2762582B1|2019-03-06|
    US9162422B2|2015-10-20|
    CN103842541B|2016-03-30|
    ES2725803T3|2019-09-27|
    CA2850340A1|2013-04-04|
    KR101614230B1|2016-04-20|
    PL2762582T3|2019-08-30|
    EP2762582A1|2014-08-06|
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    法律状态:
    2018-07-31| B06A| Patent application procedure suspended [chapter 6.1 patent gazette]|
    2019-03-06| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2019-04-30| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 28/09/2012, OBSERVADAS AS CONDICOES LEGAIS. (CO) 20 (VINTE) ANOS CONTADOS A PARTIR DE 28/09/2012, OBSERVADAS AS CONDICOES LEGAIS |
    2019-11-26| B25D| Requested change of name of applicant approved|Owner name: NIPPON STEEL CORPORATION (JP) |
    2021-08-10| B21F| Lapse acc. art. 78, item iv - on non-payment of the annual fees in time|Free format text: REFERENTE A 9A ANUIDADE. |
    2021-11-30| B24J| Lapse because of non-payment of annual fees (definitively: art 78 iv lpi, resolution 113/2013 art. 12)|Free format text: EM VIRTUDE DA EXTINCAO PUBLICADA NA RPI 2640 DE 10-08-2021 E CONSIDERANDO AUSENCIA DE MANIFESTACAO DENTRO DOS PRAZOS LEGAIS, INFORMO QUE CABE SER MANTIDA A EXTINCAO DA PATENTE E SEUS CERTIFICADOS, CONFORME O DISPOSTO NO ARTIGO 12, DA RESOLUCAO 113/2013. |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2011-218775|2011-09-30|
    JP2011218775|2011-09-30|
    PCT/JP2012/075218|WO2013047821A1|2011-09-30|2012-09-28|High-strength galvannealed steel sheet of high bake hardenability, high-strength alloyed galvannealed steel sheet, and method for manufacturing same|
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