• 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:
    It is a non-oriented electromagnetic steel sheet having a component composition containing 0.01% by weight or less than C, 6% by weight or less than Si, 0.05 to 3% by weight of Mn, 0.2% by weight or less than P, 2% by weight or less, preferably 0.005% by weight or less than Al, 0.005% by weight or less than N, 0.01% by weight or less than S, and 0 , 0005% by weight or less of Ga. This non-oriented electromagnetic steel sheet has excellent magnetic characteristics even if the steel sheet is produced without annealing hot-rolled sheet.
    公开号:BR112017001223B1
    申请号:R112017001223-5
    申请日:2015-06-24
    公开日:2021-03-09
    发明作者:Hiroaki Nakajima；Tomoyuki Okubo；Tadashi Nakanishi；Yoshihiko Oda
    申请人:Jfe Steel Corporation；
    IPC主号:
    专利说明:

    TECHNICAL FIELD
    [001] This invention relates to an unoriented electric steel sheet, and specifically to an unoriented electric steel sheet that has excellent magnetic properties. RELATED TECHNIQUE
    [002] A non-oriented electric steel sheet is a type of soft magnetic material widely used as an iron core material for rotors and the like. In recent energy saving trends, there are increasing demands for improving efficiency, decreasing size and reducing weight of electrical machinery, and therefore, it becomes more important to perfect the magnetic properties of the iron core material.
    [003] Non-electric steel sheet is normally produced by subjecting a crude steel material (plate) containing silicon to hot rolling, hot band annealing if necessary, cold rolling and finishing annealing. . In order to achieve excellent magnetic properties, it is required to obtain an adequate texture for the magnetic properties in a stage after the annealing finish. For that purpose, hot band annealing is considered essential.
    [004] However, the addition of the hot strip annealing process has a problem in which not only does the number of days for production become long, but the cost of production is also increased. In particular, an increase in productivity and a decrease in the cost of production have recently started to be considered important in association with an increased demand for electric steel sheet and, therefore, techniques for omitting hot strip annealing have been actively developed. .
    [005] As the technique for omitting hot band annealing, for example, Patent Document 1 discloses a method for improving the magnetic properties by lowering the S content to no more than 0.0015% by weight to improve the growth of crystal grains, adding Sb and Sn to suppress nitriding of the surface layer, and rolling the plate at a high temperature during hot rolling to thicken the size of the crystal grain of the hot-rolled plate that has an influence on the magnetic flux density.
    [006] Patent Document 2 discloses a technique as for a method of producing an unoriented electric steel sheet in which a loss of iron is decreased and a magnetic flux density is increased without conducting the hot strip annealing by controlling it the component alloy elements, optimizing the hot rolling conditions and using the steel phase transformation to control the hot rolled texture. PREVIOUS TECHNICAL DOCUMENTS PATENT DOCUMENTS
    [007] Patent Document 1: JP-A-2000-273549
    [008] Patent Document 2: JP-A-2008-524449 SUMMARY OF THE INVENTION TASK TO BE SOLVED BY THE INVENTION
    [009] In the method disclosed in Patent Document 1, however, it is necessary to reduce the S content to an extremely low amount, so that the production cost (desulfurization cost) is increased. Also, in the Patent Document 2 method, there are several restrictions on steel ingredients and hot rolling conditions, so there is a problem where actual production is hampered.
    [0010] The invention is produced in view of the problems above the conventional technique, and an objective of the same is to provide a non-oriented electric steel sheet that has excellent magnetic properties at a low cost even if the hot strip annealing is omitted. SOLUTION FOR THE TASK
    [0011] The inventors focused on an influence of unavoidable impurities contained in the crude steel material under the magnetic properties and produced several studies to solve the above task. As a result, it has been found that the magnetic flux density and the iron loss property can be significantly increased by decreasing, in particular, the Ga among the unavoidable impurities to an extremely low amount or by further decreasing the Al to an amount extremely low even if hot band annealing is omitted, and the invention has been completed.
    [0012] That is, the invention is a non-oriented electric steel sheet that has a chemical composition comprising C: no more than 0.01% by weight, Si: no more than 6% by weight, Mn: 0.05 a 3% by mass, P: no more than 0.2% by mass, Al: no more than 2% by mass, N: no more than 0.005% by mass, S: no more than 0.01% by mass, Ga : no more than 0.0005% by weight and the remainder is Fe and unavoidable impurities.
    [0013] The electric steel sheet not oriented according to the invention is characterized by the fact that the Al content is not more than 0.005% by weight.
    [0014] Also, the electric steel sheet not oriented according to the invention is characterized by containing one or two among Sn: 0.01 to 0.2% by weight and Sb: 0.01 to 0.2% by weight additionally chemical composition above.
    [0015] In addition, the electric steel sheet not oriented according to the invention is characterized by containing one or more selected from Ca: 0.0005 to 0.03% by weight, REM: 0.0005 to 0.03% mass and Mg: 0.0005 to 0.03% by mass in addition to the above chemical composition.
    [0016] In addition, the non-oriented electric steel sheet of the invention is characterized by containing one or more selected from Ni: 0.01 to 2.0% by weight, Co: 0.01 to 2.0% in mass, Cu: 0.03 to 5.0% by weight and Cr: 0.05 to 5.0% by weight in addition to the above chemical composition. EFFECT OF THE INVENTION
    [0017] According to the invention, the non-oriented electric steel sheet that has excellent magnetic properties can be produced even if the hot strip annealing is omitted, so that it is possible to supply unoriented electric steel sheets that have excellent magnetic properties at a low cost in a short period of time. BRIEF DESCRIPTION OF THE DRAWINGS
    [0018] Figure 1 is a graph showing an influence of Ga content under a magnetic flux density B50.
    [0019] Figure 2 is a graph showing an influence of Al content under a magnetic flux density B50. MODALITIES FOR CARRYING OUT THE INVENTION
    [0020] First, experiments that build an initiative on the development of the invention will be described. EXPERIMENT 1
    [0021] The inventors investigated an influence of Gaco content as an unavoidable impurity under the magnetic flux density in order to develop a non-oriented electric steel sheet that has excellent magnetic properties even if the hot strip annealing is omitted.
    [0022] Steels prepared by varying an additional amount of Ga within a range of tr.-0.002% by weight in a chemical composition system comprising C: 0.0025% by weight, Si: 3.0 % by mass, Mn: 0.25% by mass, P: 0.01% by mass, N: 0.002% by mass, S: 0.002% by mass and Al: two levels of 0.2% by mass and 0.002% in bulk they are fused and molded in a laboratory way to form steel ingots, which are hot rolled to form hot rolled sheets of 3.0 mm thick and subjected to a heat treatment that corresponds to a cooling temperature of 750 ° C. Since then, hot-rolled sheets have been stripped without conducting a hot-strip annealing and cold-rolled to form cold-rolled sheets that have a thickness of 0.50 mm, which are subjected to a finish annealing at 1,000 ° C for 10 seconds under an atmosphere of 20% volume of H2 to 80% volume of N2.
    [0023] The magnetic flux densities B50 of the then obtained steel sheets after the annealing finish were measured by a 25 cm Epstein method to obtain the results shown in Figure 1.
    [0024] As seen from the results, the B50 magnetic flux density is rapidly increased when the Ga content is not more than 0.0005% by mass, and the effect of increasing the magnetic flux density due to the decrease in the magnetic content Ga is higher when the Al content is 0.002% by weight than 0.2% by weight. EXPERIMENT 2
    [0025] The inventors conducted an experiment to investigate an influence of Al content under the magnetic flux density.
    [0026] Steels prepared by varying in a varied way an additional amount of Al within a range of tr.-0.01% by weight in a chemical composition system comprising C: 0.0025% by weight, Si: 3, 0% by mass, Mn: 0.25% by mass, P: 0.01% by mass, N: 0.002% by mass, S: 0.002% by mass and Ga decreased to 0.0002% by mass are melted in one the laboratory way and the magnetic flux densities B50 of the steel sheets, after the annealing finish, in the same way as in Experiment 1, are measured by a 25 cm Epstein method.
    [0027] Figure 2 shows a relationship between the Al content and the magnetic flux density B50 with respect to the results measured above. As seen from this figure, the magnetic flux density is increased when the Al content is not more than 0.005% by mass.
    [0028] As seen from the above experimental results, the magnetic flux density can be significantly increased by decreasing the Ga content to no more than 0.0005% by weight or further decreasing the Ga content to no more than 0.0005% by weight while decreasing the Al content to no more than 0.005% by weight.
    [0029] The reason why the magnetic flux density is significantly increased by decreases in Ga content and Al content is still not clear enough, however, it is assumed that the recrystallization temperature of the raw material is lowered by decreasing Ga to change the recrystallization behavior in hot rolling to thereby improve the texture of the hot rolled sheet. Particularly, the reason why the magnetic flux density is considerably increased when the Al content is not more than 0.005% by mass is considered due to the fact that the granular limit mobility is altered by the decrease of Ga and Al to promote the growth of crystal orientation advantages for magnetic properties.
    [0030] The invention is developed based on the above innovative knowledge.
    [0031] In the following, a chemical composition required in the electric steel sheet not oriented according to the invention will be explained. C: no more than 0.01% by weight
    [0032] C results in magnetic aging in a product plate, so as to be limited to no more than 0.01% by weight. Preferably, it is no more than 0.005% by mass. Si: no more than 6% by mass
    [0033] Si is an effective element to increase a specific resistance of steel to decrease a loss of iron, so that it is preferable to be contained in an amount not less than 1% by mass. When it is added in an amount that exceeds 6% by mass, however, it is difficult to perform cold lamination due to the fact that considerable embrittlement is caused, so that the maximum limit is set at 6% by mass. Preferably, it is a range of 1 to 4% by mass, and more preferably a range of 1.5 to 3% by mass. Mn: 0.05 to 3% by weight
    [0034] Mn is an effective element to avoid red fragility in hot lamination and, therefore, requires to be contained in an amount not less than 0.05% by mass. When it exceeds 3% by mass, however, the property of cold rolling is deteriorated or the decrease in magnetic flux density is caused, so that the maximum limit is set at 3% by mass. Preferably, it is a range of 0.05 to 1.5% by mass. More preferably, it is a range of 0.2 to 1.3% by mass. P: no more than 0.2% by mass
    [0035] P can be added because it is excellent in the strength of the solid solution and is an effective element to adjust stiffness to improve the steel punching capacity. However, when the amount exceeds 0.2% by mass, the embrittlement becomes considerable, so that the maximum limit is set at 0.2% by mass. Preferably, it is not more than 0.15% by mass, more preferably not more than 0.1% by mass. S: no more than 0.01% by weight
    [0036] S is a harmful element that forms sulfides, such as MnS or similar, to increase the loss of iron, so that the maximum limit is set at 0.01% by mass. Preferably, it is not more than 0.005% by mass, and more preferably not more than 0.003% by mass. Al: no more than 2% by mass
    [0037] Al can be added as it is an effective element to increase a specific resistance of steel to decrease a loss of eddy current. However, when it exceeds 2.0% by mass, the property of cold rolling is deteriorated, so that the maximum limit is set at 2.0% by mass.
    [0038] In order to receive more the effect of improving the magnetic properties by decreasing Ga, it is preferable to decrease it to no more than 0.005% by mass. More preferably, it is not more than 0.001% by mass. N: no more than 0.005% by mass
    [0039] N is a harmful element that forms nitrile to increase iron loss, so the maximum limit is set at 0.005% by mass. Preferably, it is not more than 0.003% by mass. Ga: no more than 0.0005% by mass
    [0040] Ga is the most important element in the invention because it has a substantial influence on the texture of a hot-rolled sheet even in small quantities. In order to suppress the bad influence, it must be no more than 0.0005% by mass. Preferably, it is not more than 0.0001% by mass.
    [0041] The electric steel sheet not oriented according to the invention can contain one or two of Sn and Sb in ranges of Sb: 0.01 to 0.2% by weight and Sn: 0.01 to 0.2% in bulk in addition to the above ingredients to optimize the magnetic properties.
    [0042] Sb and Sn perfect a product plate texture and are effective elements to increase the magnetic flux density. The above effect is achieved in an additional amount of not less than 0.01% by weight. On the other hand, when it exceeds 0.2% by mass, the above effect is saturated. Therefore, in the case of adding the elements, it prefers that each element is in a range of 0.01 to 0.2% by mass. More preferably, they are in a range of Sb: 0.02 to 0.15% by weight and Sn: 0.02 to 0.15% by weight.
    [0043] The electric steel sheet not oriented according to the invention may additionally contain one or more selected from Ca, REM and Mg in Ca ranges: 0.0005 to 0.03% by weight, REM: 0, 0005 to 0.03% by weight and Mg: 0.0005 to 0.03% by weight in addition to the above ingredients.
    [0044] Each of Ca, REM and Mg fixes S to suppress fine sulfide precipitation and is an effective element in reducing iron loss. In order to obtain such an effect, it is required to add each element in an amount of not less than 0.0005% by mass. However, when it is added in an amount that exceeds 0.03% by mass, the effect is saturated. Therefore, in the case of adding Ca, REM and Mg, it is preferred that each element is in a range of 0.0005 to 0.03% by mass. Most preferably, it is in the range of 0.001 to 0.01% by mass.
    [0045] The electric steel sheet not oriented according to the invention can additionally contain one or more selected from Ni, Co, Cu and Cr in Ni bands: 0.01 to 2.0% by weight, Co: 0.01 to 2.0% by weight, Cu: 0.03 to 5.0% by weight and Cr: 0.05 to 5.0% by weight in addition to the above ingredients.
    [0046] Ni, Co, Cu and Cr are effective elements to decrease the iron loss for each element to increase the specific resistance of steel. In order to obtain such an effect, it is preferred to add Ni and Co in an amount of not less than 0.01% by weight for each, Cu in an amount of not less than 0.03% by weight and Cr in an amount of no less than 0.05% by mass. However, when Ni and Co are added in an amount that exceeds 2.0% by mass and Cu and Cr are added in an amount that exceeds 5.0% by mass, an alloying cost is increased. Therefore, in the case of adding Ni and Co, each quantity is in a range of 0.01 to 2.0% by mass, and in the case of adding Cu, the quantity is in a range of 0.03 to 5.0% by mass, and in the case of adding Cr, the amount is in the range of 0.05 to 5.0% by mass. More preferably, it is Ni: 0.03 to 1.5% by weight, Co: 0.03 to 1.5% by weight, Cu: 0.05 to 3.0% by weight and Cr: 0.1 to 3 , 0% by mass.
    [0047] The remainder, in addition to the above ingredients on the non-oriented steel sheet according to the invention, is Fe and unavoidable impurities. However, the addition of other elements can be accepted within a range that does not damage the effects of the invention.
    [0048] In the following, the method for producing the non-oriented electric steel sheet according to the invention will be described below.
    [0049] The electric steel sheet not oriented according to the invention can be produced by the conventionally well-known production method for the electric steel sheet not oriented as long as Ga and Al are contained in the above mentioned bands as a raw material used in the production. For example, it can be produced by a method in which a steel adjusted to have the predetermined chemical composition in a refining process to melt the steel in a converter, an electric furnace or the like and to carry out secondary refining in a degassing apparatus a vacuum or similar is subjected to a flowering method made by ingot or continuous molding to form a crude steel material (plate), which is then subjected to hot rolling, pickling, cold rolling, finishing annealing and the application and cooking of an insulating coating.
    [0050] In the production method of the electric steel sheet not oriented according to the invention, excellent magnetic properties can be obtained even if the annealing of the hot strip after the hot rolling is omitted. However, hot band annealing can be conducted, and at that time, an immersion temperature is preferable to be in the range of 900 to 1,200 ° C. When the immersion temperature is lower than 900 ° C, the effect of hot strip annealing cannot be sufficiently achieved and therefore the effect of further improving the magnetic properties cannot be achieved. On the other hand, when it exceeds 1,200 ° C, the grain size of the hot-rolled sheet is too thick, and there is a fear of causing cracks or fractures during cold rolling and becomes disadvantageous to the cost.
    [0051] Also, the cold rolling lamination from the hot-rolled plate to the cold-rolled plate with a product plate thickness (final thickness) can be conducted one or two or more times interposing an intermediate annealing between them . Particularly, it is preferred that the final cold lamination for the final thickness is a warm lamination performed at an elevated sheet temperature of approximately 200 ° C as it has a great effect in increasing the magnetic flux density as long as there is no problem in the equipment, production or cost restriction.
    [0052] It is preferred that the finishing annealing submitted to the cold-rolled sheet with the final thickness is a continuous annealing performed by immersion at a temperature of 900 to 1,150 ° C for 5 to 60 seconds. When the immersion temperature is lower than 900 ° C, recrystallization is not sufficiently promoted and good magnetic properties are not obtained. Although, when it exceeds 1,150 ° C, crystal grains are thickened and the loss of iron in a high frequency zone is particularly increased.
    [0053] It is preferred that the steel plate, after the annealing finish, is coated on its surface with an insulating coating to increase the resistance between layers to decrease the loss of iron. It is particularly desirable to apply a semi-organic insulating coating that contains a resin to ensure a good puncture capability.
    [0054] The non-oriented electric steel sheet coated with the insulating coating can be used after subjected to stress relief annealing by users, or it can be used without stress relief annealing. Also, a strain relief annealing can be performed after a punching process is conducted by users. Strain relief annealing is normally carried out under a condition of about 750 ° C for 2 hours. EXAMPLE
    [0055] Steels number 1 to 31 that have a chemical composition shown in Table 1 are cast in a converter degassing treatment refining process and continuously molded to form steel plates, which are heated to a temperature 1,140 ° C for 1 hour and hot rolled at a finishing hot rolling temperature of 900 ° C to form hot rolled sheets that have a sheet thickness of 3.0 mm, and wrap around a coil at a temperature of 750 ° C. The coil is then stripped without being subjected to hot-band annealing, and cold-rolled once to provide a cold-rolled sheet that has a sheet thickness of 0.5 mm, which is subjected to an annealing of finishing under immersion conditions of 1,000 ° C and 10 seconds to provide a non-oriented electric steel sheet.
    [0056] From the then obtained steel plate obtained, Epstein test specimens with 30 mm x 280 mm are taken to measure a loss of iron W15 / 50 and a magnetic flux density B50 by a 25 cm Epstein apparatus, the results which are also shown in Table 1.
    [0057] As seen from Table 1, non-oriented electrical steel sheets that have excellent magnetic properties can be obtained by controlling a chemical composition of a crude steel material for the bands of the invention even if the band annealing at hot is omitted.
    Continuation
    权利要求:
    Claims (2)
    [0001]
    1. Non-oriented electric steel sheet characterized by the fact that it has a chemical composition consisting of C: that 0.01% or less by weight, Si: 6% or less by weight, Mn: 0.05 to 3% by weight , P: 0.2% or less by weight, Al: 2% or less by weight, N: 0.005% or less by weight, S: 0.01% or less by weight, Ga: 0.0005% or less by weight mass, optionally one or two from Sn: 0.01 to 0.2% by mass and Sb: 0.01 to 0.2% by mass, and optionally one or more selected from Ca: 0.0005 to 0.03 % by mass, Rare Earths: 0.0005 to 0.03% by mass and Mg: 0.0005 to 0.03% by mass, and optionally one or more selected from Ni: 0.01 to 2.0% in mass, Co: 0.01 to 2.0% by mass, Cu: 0.03 to 5.0% by mass and Cr: 0.05 to 5.0% by mass, the remainder being Fe and unavoidable impurities.
    [0002]
    2. Electric steel sheet not oriented, according to king-vindication 1, characterized by the fact that the Al content is 0.005% or less by weight
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    法律状态:
    2019-08-20| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2021-01-12| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
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    申请号 | 申请日 | 专利标题
    JP2014-167609|2014-08-20|
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    PCT/JP2015/068123|WO2016027565A1|2014-08-20|2015-06-24|Non-oriented electromagnetic steel sheet having excellent magnetic characteristics|
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