• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    STEEL SHEET FOR HOT PRESSING AND METHOD OF PRODUCTION OF HOT PRESSED PARTS USING STEEL SHEET FOR HOT PRESSING To provide a hot pressed steel plate from which a hot pressed part is excellent for corrosion resistance in perforation is possible and a method of producing a hot-pressed part using the hot-pressed steel plate, a hot-pressed steel plate is provided having, sequentially, on the surface of the base steel plate: one coating layer I containing 60% by weight or more of Ni and the remainder consisting of Zn and the inevitable impurities, a coating mass of it being 0.01 to 5 g / m2, and a coating layer II containing 10 to 25 % by mass of Ni and the remainder consisting of Zn and the inevitable impurities, a coating mass of the same being 10 to 90 g / m2.
    公开号:BR112013002586B1
    申请号:R112013002586-7
    申请日:2011-08-02
    公开日:2020-10-27
    发明作者:Seiji Nakajima；Tatsuya Miyoshi；Hiroki Nakamuru
    申请人:Jfe Steel Corporation；
    IPC主号:
    专利说明:

    Field
    [001] The present invention relates to a steel plate for hot pressing, the steel plate being suitable for producing a part such as a chassis skin or a structural body part of an automobile by hot pressing, and to a method of producing a hot-pressed part using hot-pressed steel plate. Background
    [002] Conventionally, many of the parts, such as chassis parts and car body structural parts, were produced by forming by pressing steel sheets having a certain resistance. In recent years, from the point of view of conserving the global environment, the reduction in weight of automobile bodies has been strongly desired, and efforts have been made continuously to increase the resistance of the steel plates to be used and to reduce their thickness. However, since the pressing capacity of steel sheets decreases as the strength of the steel sheet increases, many of the steel sheets are becoming more difficult to be shaped into the desired shapes.
    [003] Consequently, Patent Literature 1 proposes a forming technique called hot pressing, which allows both simplification of forming and reinforcement by cooling the steel sheet together with the forming of the heated steel sheet using a mold consisting of a die and a stamping tap. However, as for this hot pressing, since the steel sheet is heated to a high temperature of about 950 ° C before hot pressing, scalings (iron oxide) are formed on the surface of the steel sheet. Consequently, the scales formed on the surface of the steel sheet, when peeled in hot pressing, damage the mold or damage the surface of the part after hot pressing. In addition, the scales that remain on the surface of the piece cause defects in appearance and decrease in paint adhesion. Consequently, the scale on the surface of the part is usually removed by carrying out a treatment such as blasting or shot blasting, but this makes the production process complicated and results in decreased productivity. In addition, parts such as chassis parts or car body structural parts also require excellent corrosion resistance, but an anti-rust coating such as a coating layer is not provided on a hot-pressed part produced by the process mentioned above and then, corrosion resistance is very insufficient.
    [004] In view of such fundamentals, a hot pressing technique capable of suppressing scaling on heating prior to hot pressing and improving the corrosion resistance of parts after hot pressing is being demanded, and a proposal has been proposed steel sheet provided with a coating such as a coating layer on its surface and a method for hot pressing using it. For example, Patent Literature 2 describes a method of producing a hot-pressed part having excellent corrosion resistance, in which a steel sheet coated with Zn or with a Zn-based alloy is hot-pressed and a compound-based of Zn-Fe or a compound based on Zn-Fe-AI is supplied on its surface. In addition, Patent Literature 3 describes a hot-pressed product (piece) excellent in workability, weldability, and corrosion resistance, which is shaped by heating at 700 ° C to 1000 ° C for 2 to 20 minutes and subsequently hot pressing a galvannealed steel plate, and providing a coating layer including a solid Fe-Zn solution phase on its surface. List of Citations Patent Literature Patent Literature 1: United Kingdom Patent No. 1490535 Patent Literature 2: Japanese Patent No. 3663145 Patent Literature 3: Japanese Patent No. 4039548 summary Technical problem
    [005] However, there was a problem that the hot-wired part described in Patent Literature 2 or Patent Literature 3 is inferior in corrosion resistance compared to corrosion in drilling (hereinafter referred to as “resistance to corrosion in drilling” ) likely to occur in a portion to which a film of a chemical conversion coating or electroplating coating is unable to reach and be applied.
    [006] It is an object of the present invention to provide a hot pressed steel plate from which a hot pressed piece excellent in corrosion resistance in drilling is obtainable and a method of producing a hot pressed piece using the steel plate for hot pressing. Solution to the Problem
    [007] The inventors obtained the discoveries below as a result of a diligent study on steel sheets for hot pressing that achieve the objective mentioned above. (1) The lower resistance to corrosion in the perforation of the hot pressed part produced using the steel sheet on which the coated layer of Zn or Zn-based alloy described in Patent Literature 2 or Patent Literature 3 is caused by the considerable decrease in the effect of the sacrificial corrosion protection that Zn inherently has due to the Zn in the coating layer being diffused in the steel plate under the coating layer, that is, the base steel plate of the coating layer and socket in the Fe-Zn solid solution phase or forming a large amount of zinc oxide on the surface of the coating layer. (2) To suppress the diffusion of Zn in the coating layer on the base steel plate, it is effective to provide, on the surface of the steel plate, a coating layer 1, which contains 60% by weight or more of Ni and the rest of which consists of in Zn and the inevitable impurities. In addition, to suppress the formation of a large amount of zinc oxide on the surface of the coating layer, it is effective to provide, in coating layer I, a coating layer II containing 10 to 25 wt% Ni and the remainder consisting of Zn and the inevitable impurities.
    [008] The present invention was made on the basis of the above findings, and provides a steel plate for hot pressing, sequentially having on a surface of a base steel plate: a coating layer I containing 60% by mass or more than Ni and the remainder consisting of Zn and the inevitable impurities, its coating mass being 0.01 to 5 g / m2; and a coating layer II containing 10 to 25% by weight of Ni and the remainder consisting of Zn and the inevitable impurities, its coating mass being 10 to 90 g / m2.
    [009] The hot press steel plate according to the present invention preferably also has, in the coating layer II, at least one type of composite layer selected from: a Si-containing composite layer; a composite layer containing Ti; a composite layer containing Al; and a composite layer containing Zr.
    [0010] As a base steel plate in the hot pressing steel plate according to the present invention, a steel plate can be used which has a component composition containing, in mass%, 0.15 to 0.5% of Ç; 0.05 to 2.0% Si; 0.5 to 3% Mn; 0.1% or less of P; 0.05% or less of S; 0.1% or less of Al; and 0.01% or less of N, the remainder of the component composition consisting of Fe and the inevitable impurities. This base steel sheet preferably contains one or both of: at least one type of element selected from, in mass%, 0.01 to 1% Cr, 0.2% or less Ti, and 0.0005 to 0 , 05% B; and 0.003 to 0.03% Sb.
    [0011] The present invention provides a method of producing a hot-pressed part, including: heating the hot-pressed steel plate according to the present invention to a temperature range from the transformation point Acs to 1000 ° C; and then hot pressing the steel plate for hot pressing. In the production method of the hot pressed part according to the present invention, when heating up to a temperature range of the transformation point Aca to 1000 ° C, heating is carried out at an average rate of temperature increase of 100 ° C / s or more. Advantageous Effects of the Invention
    [0012] According to the present invention, it is possible to produce a hot-pressed steel plate from which an excellent hot-pressed part and corrosion resistance in drilling can be obtained. The hot pressed part produced by a method of the present invention of producing a hot pressed part using the steel sheet of the present invention for hot pressing is suitable for a part such as a chassis part or structural body part of a car. Description of Modalities (1) Steel plate for hot pressing (1-1) Coating layer
    [0013] In the present invention, to suppress the diffusion of Zn from a coating layer on a base steel plate and obtain excellent corrosion resistance performance, a coating layer I, which contains 60% by mass or more of Ni, and the rest of which consists of Zn and the inevitable impurities is provided on a steel sheet surface. This is because when the amount of Ni in the coating layer I is less than 60% by mass, it is impossible to sufficiently suppress the diffusion of Zn from the coating layer on the base steel plate and obtain adequate corrosion resistance during drilling. The amount of Ni in coating layer I is preferably 100% by mass, but if it is less than 100% by mass, the remainder is: Zn which has a sacrificial protection effect against corrosion; and the inevitable impurities. In addition, the coating mass of coating layer I is 0.01 to 5 g / m 2 per side. This is because when the coating mass is less than 0.01 g / m2, the suppression effect of the diffusion of Zn in the base steel plate is not sufficiently exhibited, and when the coating mass exceeds 5 g / m2, the effect it is saturated and attracts increased costs.
    [0014] In the present invention, to suppress the formation of a large amount of zinc oxide on the surface of the coating layer and to obtain excellent corrosion resistance during drilling, a coating layer II is provided in the coating layer I mentioned above. Coating layer II contains 10 ° to 25% by weight of Ni and the remainder consists of Zn and the inevitable impurities. This is because by adjusting the amount of Ni in the coating layer II to 10 to 25% by mass, a y phase having a crystal structure of any between NÍ2Znn, NiZns, or NisZn2i and a high melting point of 881 ° C is formed, thereby suppressing to a minimum the reaction of zinc oxide formation on the surface of the coating layer during heating. In addition, this is because the coating layer II having such a composition remains as phase y even after the end of the hot pressing, thereby exhibiting excellent resistance to pitting corrosion by the sacrificial protection effect of Zn against corrosion. The formation of the y-phase when the amount of Ni is 10 to 25% by mass is not necessarily consistent with the equilibrium diagram for the Ni-Zn alloy. This is considered to be because the coating layer formation reaction carried out by an electroplating method or the like continues to be unbalanced. The y phase of NÍ2Znn, NiZns, or NisZn2i can be confirmed by an x-ray diffraction method or an electron diffraction method using an electron transmission microscope (TEM). In addition, although phase y is, as described above, formed by adjusting the amount of Ni in coating layer II to 10 to 25% by mass, some phase η may also be present depending on the conditions, etc., of the electroplating. In this case, to suppress the zinc oxide formation reaction on the surface of the coating layer during heating, the amount of phase η is preferably 5% by weight or less. The amount of phase η is defined by the weight ratio of phase η to the total weight of the coating layer II, and can, for example, be determined by an anodic dissolution method.
    [0015] The coating mass of coating layer II is 10 to 90 g / m2 per side. When the coating mass is less than 10 g / m2, the sacrificial protection effect of Zn against corrosion is not sufficiently exhibited, and when the coating mass of coating layer II exceeds 90 g / m2 'the effect is saturated and an increase in costs is caused.
    [0016] Although a method of forming the coating layer I or coating layer II is not particularly limited, a well-known electrogalvanizing method is suitable.
    [0017] If at least one type of composite layer selected from a composite layer containing Si, a composite layer containing Ti, a composite layer containing Al, and a composite layer containing Zr is also provided in the coating layer II, an excellent result is obtained paint adhesion. To achieve such an effect, the thickness of the composite layer is preferably 0.1 µm or greater. In addition, the thickness of the composite layer is preferably 3.0 µm or less. This is because when the thickness of the composite layer is equal to or less than 3.0 pm, there is no possibility of attracting a decrease in ink adhesion due to the composite layer becoming brittle. The thickness of the composite layer is most preferably in the range of 0.4 to 2.0 pm.
    [0018] As the Si-containing compound, for example, a silicon resin, lithium silicate, sodium silicate, colloidal silica, a silane binding agent, or the like is applicable. As a Ti-containing compound, for example, titanates such as lithium titanate or calcium titanate, a titanium bonding agent containing titanium alkoxide, or a chelate type titanium compound as the base agent, or the like, is applicable. As an Al-containing compound, for example, aluminates such as sodium aluminate or calcium aluminate, an aluminum binding agent containing aluminum alkoxide or an aluminum compound of the chelate-type base agent, or the like is applicable. As a compound containing Zr, for example, zirconates such as lithium zirconate or calcium zirconate, a zirconium bonding agent containing zirconium alkoxide or a chelate type zirconium compound as the base agent, or the like is applicable.
    [0019] To form the aforementioned composite layer in the coating layer II, in the coating layer II, the adhesion treatment of at least one type of compound selected from the above mentioned Si-containing compound, Ti-containing compound, Al-containing compound and Compound containing Zr can be performed, and subsequently hot drying can be performed without washing with water. The adhesion treatment for these compounds can be any one between a coating process, an immersion process, and a spraying process; and a cylinder liner, a compression liner, a matrix liner, or the like can be used. After coating treatment, immersion treatment or spray treatment, by compression coating or similar, adjustment of the coating amount, regularization of appearance, or uniformity of thickness is possible by an air knife method or a roller method compressor. In addition, heat drying can be carried out with the maximum temperature reached by the steel sheet being within the range 40 to 200 ° C, and preferably within the range 60 to 160 ° C.
    [0020] The method of forming the composite layer mentioned above in coating layer II is not limited to the method mentioned above. For example, it is also possible to form the composite layer mentioned above in coating layer II by the method of performing a reactive treatment of immersing the steel sheet having coating layer I and coating layer II in an acidic aqueous solution containing at least a type of cation selected from Si, Ti, Al and Zr and at least one type of anion selected from phosphate ion, hydrofluoric acid ion, and fluoride ion and thereafter heat-drying with water washing or without water washing.
    [0021] The composite layer mentioned above may contain a solid inorganic lubricant. This is because by the inclusion of the solid inorganic lubricant, the dynamic friction coefficient in the hot pressing is reduced and the forming capacity by pressing is improved.
    [0022] As a solid inorganic lubricant, at least one type selected from a metal sulfide (molybdenum disulphide, tungsten disulphide, or similar), a selenium compound (molybdenum selenide, tungsten selenide, or similar), graphite, a fluoride (graphite fluoride, calcium fluoride, or similar), a nitride (boron nitride, silicon nitride, or similar), borax, mica, metallic tin, and an alkali metal sulfate (sodium sulfate, potassium sulfate, or similar) may apply. The content of the aforementioned solid inorganic lubricant in the composite layer is preferably 0.1 to 20% by weight. This is because when this content is 0.1% by weight or more, the lubrication effect is obtained and when the content is 20% by weight or less, the adhesion of the paint is not deteriorated. (1-2) Base steel plate
    [0023] To obtain the hot pressed part having a tensile strength (TS) of 980 MPa or greater, as a base steel sheet of a coating layer, for example, a hot-rolled steel sheet or a cold rolled steel sheet having a component composition that contains, in weight%, 0.15 to 0.5% C, 0.05 to 2.0% Si, 0.5 to 3% Mn, 0.1% or less of P, 0.05% or less of S, 0.1% or less of Al, and 0.01% or less of N, the remainder of which consists of Fe and the inevitable impurities. The reason for limiting the content of each component element is explained below. Here, "%" representing the content of each component means "% by mass" unless otherwise specified. C: 0.15 to 0.5%
    [0024] C is an element that improves the strength of the steel and to make the TS of the hot-pressed part 980 MPa or greater, its content needs to be 0.15% or greater. If the C content exceeds 0.5%, the sheet metal stamping work capacity as a base material is noticeably deteriorated. Therefore, the C content is 0.15 to 0.5%. Si: 0.05 to 2.0%
    [0025] Si is, similarly to C, an element that improves the strength of steel and, to increase the TS of the hot pressed part to 980 MPa or more, its content needs to be 0.05% or more. If the Si content exceeds 2.0%, the generation of a surface defect called red scale is greatly increased in hot rolling and the rolling load is increased or the ductility of the hot rolled steel sheet is deteriorated. In addition, if the Si content exceeds 2.0%, when performing the coating treatment forming the coating film containing mainly Zn or Al on a surface of the steel sheet, the treatment capacity of the coating may be adversely affected. Therefore, the Si content is 0.05 to 2.0%. Mn: 0.5 to 3%
    [0026] Mn is an effective element to improve the hardening capacity by suppressing the transformation of ferrite, and decreases the transformation point Acs and then it is also effective to decrease the heating temperature before hot pressing. To exhibit such effects, its content needs to be 0.5% or more, if the Mn content exceeds 3%, the Mn segregates, and the uniformity of the characteristics of the steel sheet as the base material and the hot pressed part is degraded. Therefore, the Mn content is 0.5 to 3%. P: 0.1% or less
    [0027] When the P content exceeds 0.1%, P segregates, and the uniformity of the characteristics of the steel sheet as the base material and the hot pressed part is degraded and its toughness is also significantly decreased. Therefore, the P content is 0.1% or less. S: 0.05% or less
    [0028] When the S content exceeds 0.05%, the toughness of the hot pressed part is decreased. Therefore, the S content is 0.05% or less. Al: 0.1% or less
    [0029] When the Al content exceeds 0.1%, the stamping workability or the hardening capacity of the steel sheet as a base material is deteriorated. Therefore, the content of Al is 0.1% or less. N: 0.01% or less
    [0030] When the N content exceeds 0.01%, an AIN nitride is formed in hot rolling, or heating before hot pressing, and the stamping workability or the hardening capacity of the steel sheet as base material is deteriorated. Therefore, the N content is 0.01% or less.
    [0031] The rest of the above-mentioned components of the base steel plate are Fe and the inevitable impurities, but for the following reasons, one or both of: at least one type of element selected between 0.01 to 1% Cr, 0 , 2% or less of Ti, and 0.005 to 0.08% of B; and 0.003 to 0.03% Sb, may be contained. Cr: 0.01 to 1%
    [0032] Cr is an effective element for reinforcing steel and improving its hardening capacity. To present such effects, the Cr content is preferably 0.01% or more. If the Cr content exceeds 1%, the costs are significantly increased, and thus the upper limit of the Cr content is 1%. Ti: 0.2% or less
    [0033] Ti is an effective element to reinforce steel and improve the toughness for grain refining. In addition, it is also effective for forming a nitride in preference to the B mentioned below and has the effect of improving the hardening capacity of the solute B. However, if the Ti content exceeds 0.2%, the hot rolling lamination load is greatly increased and the toughness of the hot pressed part is decreased, and thus the upper limit of the Ti content is preferably 0.2% . B: 0.0005 to 0.08%
    [0034] B is an effective element to improve the hardening capacity in hot pressing and the toughness after hot pressing. To exhibit such effects, the B content is preferably 0.005 or more. If the B content exceeds 0.08%, the lamination load in hot rolling is greatly increased and a martensite or bainite phase is formed after hot rolling and fractures or the like are generated in the steel plate, and so the upper limit of the B content is preferably 0.08%. Sb: 0.003 to 0.03%
    [0035] Sb is effective in suppressing the decarburized layer formed in a portion of the steel plate surface layer during a period between heating the steel plate before hot pressing and cooling the steel plate through a series of hot pressing processes. To have such effects, the content needs to be 0.003% or more. If the Sb content exceeds 0.03%, the rolling load is increased and productivity is decreased. Therefore, the Sb content is 0.003 to 0.03%. (2) Hot pressed part production method
    [0036] The steel plate mentioned above for hot pressing according to the present invention is hot pressed after being heated to a temperature range from the transformation point Ac3 to 1000 ° C and becomes the hot pressed part. Heating to a temperature equal to or greater than the transformation point Ac3 before hot pressing is to form a hard phase such as a martensite or similar phase by cooling in the hot pressing, to increase the strength of the part. In addition, the upper limit of the heating temperature is 1000 ° C because a large amount of zinc oxide is formed on the surface of the coating layer if the heating temperature exceeds 1000 ° C, and it becomes impossible to obtain sufficient corrosion resistance in drilling. Here, the heating temperature mentioned above means the maximum temperature reached for the steel plate.
    [0037] In addition, when the average rate of temperature rise in heating prior to hot pressing is 100 ° C / s or more, it is also possible to suppress the formation of zinc oxide on the surface of the coating layer and also improve the corrosion resistance when drilling. The formation of zinc oxide on the surface in the coating layer is increased as the high temperature holding time under which the steel sheet is exposed under a high temperature condition is increased. Therefore, the higher the average rate of temperature rise, the shorter the retention time at high temperature can be adjusted and, as a result, it becomes possible to suppress the formation of zinc oxide on the surface of the coating layer. Here, the retention time at the maximum temperature reached of the steel sheet is not particularly limited, but to suppress the formation of zinc oxide, it is suitable that it be shortened, and is preferably 300 seconds or less, and more preferably 60 seconds or less, and even more preferably 10 seconds or less.
    [0038] As a method of heating before hot pressing: heating by an electric oven, a gas oven or similar; flame heating; conduction heating; high frequency heating; induction heating; or similar can be exemplified. In particular, to cause the average temperature rate to rise to 100 ° C / s or more, conduction heating, high frequency heating, induction heating or the like is suitable. Example 1
    [0039] As base steel plates, cold-rolled steel plates were used, having a component composition that contains, in mass%, 0.23% C, 0.25% Si, 1.2% Mn , 0.01% P, 0.01% S, 0.03% Al, 0.005% N, 0.2% Cr, 0.02% Ti, 0.0022% S, and 0.008 % of Sb, the rest of which consists of Fe and the inevitable impurities, and has an Acs transformation point of 820 ° C and a thickness of 1.6 mm. An electrogalvanizing treatment was carried out on the surfaces of these cold-rolled steel sheets by changing the current densities from 5 to 100 A / dm2 in a coating bath with a pH of 3.0 and a temperature of 50 ° C, which contained 200 g / l of nickel sulfate hexahydrate and 0 to 50 g / l of zinc sulfate heptahydrate, to form different coating layers I in Ni contents and coating masses. Then, an electrogalvanizing treatment was carried out by changing the current densities from 5 to 100 A / dm2 in a coating bath with a pH of 1.5 and a temperature of 50 ° C, which contained 200 g / l of nickel sulfate hexahydrate and 10 to 100 g / l zinc sulfate heptahydrate, to form different coating layers II in NI contents, coating masses, and η phase contents.
    [0040] Table 1 lists the results of the evaluation of the corrosion resistance in the drilling of each steel sheet having the coating layer I and the coating layer II. Each of the steel sheets, nos. 1 to 23, was heated in an electric oven or by direct electric conduction, and then cooled while being pressed between molds made of aluminum, and the evaluation of the corrosion resistance in the drilling described below was carried out . Table 1 lists the heating conditions and the cooling rate for each steel plate.
    [0041] Corrosion resistance in drilling: to evaluate corrosion resistance assuming a portion to which a chemical conversion coating or electroplating coating film does not reach and is not applied a sample was taken from the steel sheet after heat treatment , a surface not to be evaluated and an extreme surface of the sample were sealed with tape and subsequently a complex corrosion test having a cycle of: spraying with salt (an aqueous solution of 5% by mass of NaCI, 35 ° C, 2 hours); drying (60 ° C, 20 to 30% relative humidity, 4 hours); and wetting (50 ° C, 95% relative humidity, 2 hours) was performed for 150 cycles. Maximum decrease in the plate thickness of the samples was measured after the test, and the evaluation was performed based on the following criteria. When the result of the evaluation was any one between "A", "B" and "C", it was considered to satisfy the objective of the present invention. A: maximum decrease in plate thickness <0.1 mm B: 0.1 mm <maximum decrease in plate thickness <0.2 mm C: 0.2 mm <maximum decrease in plate thickness <0.3 mm D : 0.3 mm <maximum decrease in sheet thickness
    [0042] As listed in Table 1, it is understood that steel sheets 1 to 17, according to the present invention, are excellent in resistance to corrosion in drilling.


    [0043] In this example, forming by hot pressing was not actually performed, but as mentioned above, since resistance to perforation corrosion is influenced by the change in the coating layer due to heating prior to hot pressing, particularly by behavior of Zn in the coating layer, the resistance to corrosion in the perforation of the hot pressed part can be assessed by the results of this example. Second example
    [0044] On the surfaces of the base steel plates, which were the same as those of the first example, by a method similar to the first example, the different coating layers I in Ni content and coating masses and the different coating layers II in Ni content, coating mass and η phase contents were formed sequentially. Subsequently, in the coating layer II, a composition was coated (percentage of solid content of 15% by mass), which contained any one between a compound containing Si, a compound containing Ti, a compound containing Al, a compound containing Zr, and a compound containing Si and Zr which are described below and the rest of which consist of a solvent. Subsequently, heat drying was carried out under the condition in which the maximum temperature reached by the steel sheet was 140 ° C, either between a composite layer containing Si, a composite layer containing Ti, a composite layer containing Al, a composite layer containing Zr, and a composite layer containing Si and Zr that were different in thickness was formed to produce steel sheets 1 through 33. In addition, by comparison, a composite layer containing Si was formed on a galvannealed steel sheet (GA ) which was produced by subjecting the aforementioned base steel plate to hot dip coating and bonding to produce steel plate No. 34. Tables 2 and 3 list the steel plates 1 to 34 thus produced.
    [0045] As for the compound containing Si, the compound containing Ti, the compound containing Al, the compound containing Zr, and the compound containing Si and Zr, the following compounds were used: Silicon resin: KR-242A produced by Shin-Etsu Chemical Co., Ltd. Lithium silicate: lithium silicate 45 produced by Nissan Chemical Industries, Ltd. Colloidal silica: SNOWTEX OS produced by Nissan Chemical Industries, Ltd. Silane bonding agent: KBE-403 produced by Shin-Etsu Chemical Co ., Ltd. Titanium bonding agent: ORGATIX TA-22 produced by Matsumoto Fine Chemical Co., Ltd. Lithium titanate: lithium titanate produced by Titan Kogyo, Ltd. Sodium aluminate: NA-170 produced by Asahi Chemical Co. , Ltd. Aluminum bonding agent: PLENACT AL-M produced by Ajinomoto Fine-Techno Co., Inc. Zirconium acetate: zirconium acetate produced by SANEI KAKO Co., Ltd. Zirconium bonding agent: ORGATIX ZA-65 produced by Matsumoto Fine Chemical Co., Ltd.
    [0046] In addition, a solvent for using silicon resin as a compound was a diluent of ethylene glycol monobutyl ether and petroleum naphtha in a mass ratio of 55/45 respectively. In addition, a solvent for using a substance other than silicon resin as a compound was deionized water.
    [0047] The steel plates Nos 1 to 34, which were thus obtained, which each had, sequentially, on its surface, the coating layer I, the coating layer II, and the composite layer; or the galvannealed layer and the composite layer, which are listed in Tables 2 and 3, were each heated in an electric oven or by direct electrical conduction, and subsequently cooled while being sandwiched between molds made of aluminum. Subsequently, the evaluation of the corrosion resistance in drilling was carried out similar to the first example and the evaluation of the paint adhesion described below. Tables 2 and 3 list, for each steel plate, the heating condition and the cooling rate, and the results of the corrosion resistance assessments during drilling and paint adhesion.
    [0048] Paint adhesion: samples were taken from steel sheets after heat treatment and subjected to chemical conversion treatment under standard conditions using PB-SX35 produced by Nihon Parkerizing Co., Ltd. and subsequently forming a film with a film thickness of 20 pm was performed under cooking conditions at 170 ° C for 20 minutes using an electroplating paint, GT-10HT gray, produced by Kansai Paint Co., Ltd. to prepare the coating specimens. Then, cuts penetrating to the steel substrate plate were made on the surface of prepared test parts that had undergone chemical conversion treatment and electrodeposition coating in a cross-sectional pattern (10 by 10, 1 mm intervals) , with a cutting knife and a strip peeling test was performed in the cross section of adhesion and peeling using an adhesive tape. The results of the strip stripping test in the cross section were evaluated based on the following criteria. When the result of the evaluation was "A" or "B", the adhesion of the paint was considered excellent. A: without peeling B: peeled in 1 to 10 sections C: peeled in 11 to 30 sections D: peeled in 31 sections or more
    [0049] As listed in Tables 2 and 3, it is understood that in the examples of the invention, by providing the composite layer, in addition to excellence in paint adhesion, excellence in corrosion resistance in drilling is achieved.




    [0050] In the present example, forming by hot pressing has not really been performed, but similarly to the resistance to corrosion in drilling, the ink adhesion of the hot pressed part can be evaluated by the results of the present example. Industrial Applicability
    [0051] The present invention is applicable to the production of parts such as chassis parts and structural parts of automobile bodies by hot pressing.
    权利要求:
    Claims (7)
    [0001]
    1. Hot-pressed steel plate, characterized by the fact that it comprises on a surface of a base steel plate: a coating layer I on the surface of a base steel plate comprising: (i) 60% by weight or more than Ni, and (ii) a remainder comprising Zn and the inevitable impurities, a coating mass of it being 0.01 to 5 g / m2; and a coating layer II in the coating layer comprising: (i) 10 to 25% by mass of Ni, and (ii) a remainder comprising in Zn and the inevitable impurities, a coating mass of the same being 10 to 90 g / m2; where the coating layer I is provided on the surface of the base steel sheet and the coating layer II is provided on the coating layer I, and where the coating layer II comprises the y phase and the η phase, where the ratio by weight of phase η is 5% by weight or less for a total weight of coating layer II, which is determined by an anodic dissolution method.
    [0002]
    2. Steel sheet, according to claim 1, characterized by the fact that it also comprises, in the coating layer II, at least one type of composite layer selected from among; a composite layer containing Si; a composite layer containing Ti; a composite layer containing Al; and a composite layer containing Zr.
    [0003]
    3. Steel sheet according to claim 1 or 2, characterized by the fact that the base steel sheet has a composition of components comprising, in mass%, 0.15 to 0.5% of C; 0.05 to 2.0% Si; 0.5 to 3% Mn; 0.1% or less of P; 0.05% or less of S; 0.1% or less of Al; and 0.01% or less of N, the remainder of the component composition comprising Fe and the inevitable impurities.
    [0004]
    4. Steel sheet, according to claim 3, characterized by the fact that the base steel sheet still contains at least one selected type of, in mass%: 0.01 to 1% Cr; 0.2% or less of Ti; and 0.0005 to 0.08% B.
    [0005]
    5. Steel sheet according to claim 3 or 4, characterized by the fact that the base steel sheet also contains, in mass%, 0.003 to 0.03% Sb.
    [0006]
    6. Method of producing a hot-pressed part, characterized by the fact that it comprises: heating the steel sheet for hot-pressing, as defined in any of claims 1 to 5, up to a temperature range of the Acs transformation point up to 1000 ° C; and then hot pressing the steel plate for hot pressing.
    [0007]
    7. Method, according to claim 6, characterized by the fact that when heating up to the temperature range of the transformation point Acs to 1000 ° C, heating is carried out at an average rate of temperature increase of 100 ° C /I'm more.
    类似技术:
    公开号 | 公开日 | 专利标题
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    同族专利:
    公开号 | 公开日
    RU2520847C1|2014-06-27|
    MY154711A|2015-07-15|
    JP4883240B1|2012-02-22|
    EP2602359B1|2018-10-10|
    CN103038398A|2013-04-10|
    KR101361605B1|2014-02-11|
    KR20130045898A|2013-05-06|
    AU2011286715B2|2013-12-05|
    EP2602359A4|2015-12-02|
    AU2011286715A1|2013-02-14|
    JP2012233247A|2012-11-29|
    US9023488B2|2015-05-05|
    TWI451004B|2014-09-01|
    TW201207160A|2012-02-16|
    EP2602359A1|2013-06-12|
    US20130122322A1|2013-05-16|
    CN103038398B|2014-12-03|
    CA2806263C|2014-03-25|
    CA2806263A1|2012-02-09|
    WO2012018014A1|2012-02-09|
    MX2013001343A|2013-03-22|
    BR112013002586A2|2016-06-07|
    ZA201300566B|2014-03-26|
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    法律状态:
    2018-04-03| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-04-30| B06T| Formal requirements before examination [chapter 6.20 patent gazette]|
    2019-12-31| B06A| Patent application procedure suspended [chapter 6.1 patent gazette]|
    2020-04-07| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2020-10-27| 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 02/08/2011, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2010-174957|2010-08-04|
    JP2010174957|2010-08-04|
    JP2011-000553|2011-01-05|
    JP2011000553|2011-01-05|
    JP2011091633|2011-04-18|
    JP2011-091633|2011-04-18|
    JP2011-157378|2011-07-19|
    JP2011157378A|JP4883240B1|2010-08-04|2011-07-19|Steel sheet for hot press and method for producing hot press member using the same|
    PCT/JP2011/067680|WO2012018014A1|2010-08-04|2011-08-02|Steel sheet for hot stamping, and process for manufacturing hot-stamped steel products using steel sheet for hot stamping|
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