WO2021095846A1 - 無方向性電磁鋼板 - Google Patents
無方向性電磁鋼板 Download PDFInfo
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- WO2021095846A1 WO2021095846A1 PCT/JP2020/042428 JP2020042428W WO2021095846A1 WO 2021095846 A1 WO2021095846 A1 WO 2021095846A1 JP 2020042428 W JP2020042428 W JP 2020042428W WO 2021095846 A1 WO2021095846 A1 WO 2021095846A1
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- magnetic flux
- flux density
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- steel sheet
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 45
- 239000010959 steel Substances 0.000 title claims abstract description 45
- 230000004907 flux Effects 0.000 claims abstract description 74
- 238000005096 rolling process Methods 0.000 claims abstract description 72
- 238000000137 annealing Methods 0.000 claims abstract description 43
- 238000001953 recrystallisation Methods 0.000 claims abstract description 30
- 239000000203 mixture Substances 0.000 claims abstract description 12
- 239000000126 substance Substances 0.000 claims abstract description 11
- 239000002184 metal Substances 0.000 claims abstract description 9
- 229910052751 metal Inorganic materials 0.000 claims abstract description 9
- 229910052802 copper Inorganic materials 0.000 claims abstract description 7
- 229910052737 gold Inorganic materials 0.000 claims abstract description 7
- 229910052745 lead Inorganic materials 0.000 claims abstract description 7
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 7
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 7
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 7
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 229910000565 Non-oriented electrical steel Inorganic materials 0.000 claims description 55
- 229910052684 Cerium Inorganic materials 0.000 claims description 8
- 229910052779 Neodymium Inorganic materials 0.000 claims description 8
- 229910052777 Praseodymium Inorganic materials 0.000 claims description 8
- 229910052788 barium Inorganic materials 0.000 claims description 8
- 229910052793 cadmium Inorganic materials 0.000 claims description 8
- 229910052791 calcium Inorganic materials 0.000 claims description 8
- 229910052746 lanthanum Inorganic materials 0.000 claims description 8
- 229910052749 magnesium Inorganic materials 0.000 claims description 8
- 229910052712 strontium Inorganic materials 0.000 claims description 8
- 229910052725 zinc Inorganic materials 0.000 claims description 8
- 229910052698 phosphorus Inorganic materials 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 35
- 239000013078 crystal Substances 0.000 description 28
- 238000005097 cold rolling Methods 0.000 description 20
- 230000009467 reduction Effects 0.000 description 14
- 229910052742 iron Inorganic materials 0.000 description 13
- 239000000463 material Substances 0.000 description 13
- 238000000034 method Methods 0.000 description 12
- 230000009466 transformation Effects 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 10
- 238000004804 winding Methods 0.000 description 10
- 238000005098 hot rolling Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 6
- 238000005259 measurement Methods 0.000 description 5
- 238000005554 pickling Methods 0.000 description 5
- 239000002244 precipitate Substances 0.000 description 5
- 229910001566 austenite Inorganic materials 0.000 description 4
- 238000005266 casting Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 238000001887 electron backscatter diffraction Methods 0.000 description 4
- 238000004080 punching Methods 0.000 description 4
- 229910000859 α-Fe Inorganic materials 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 229910052718 tin Inorganic materials 0.000 description 3
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 150000003568 thioethers Chemical class 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/30—Stress-relieving
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- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- C—CHEMISTRY; METALLURGY
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- C21D6/00—Heat treatment of ferrous alloys
- C21D6/007—Heat treatment of ferrous alloys containing Co
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
- C21D8/1261—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest following hot rolling
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
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- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- C22C38/10—Ferrous alloys, e.g. steel alloys containing cobalt
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- C22C38/105—Ferrous alloys, e.g. steel alloys containing cobalt containing Co and Ni
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- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
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- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
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- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
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- H01F1/147—Alloys characterised by their composition
- H01F1/14708—Fe-Ni based alloys
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- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
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- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
- H01F1/14766—Fe-Si based alloys
- H01F1/14791—Fe-Si-Al based alloys, e.g. Sendust
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- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/16—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of sheets
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular fabrication or treatment of ingot or slab
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
- C21D8/1222—Hot rolling
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Definitions
- the present invention relates to non-oriented electrical steel sheets. This application has priority based on Japanese Patent Application No. 2019-206709 filed in Japan on November 15, 2019, and Japanese Patent Application No. 2019-20683 filed in Japan on November 15, 2019. Insist and use its contents here.
- the non-oriented electrical steel sheet is used for the iron core of a motor, for example, and for the non-oriented electrical steel sheet, the average in all directions parallel to the plate surface (hereinafter, “overall circumference average in the plate surface (omnidirectional average)). ”), which requires excellent magnetic properties, such as low iron loss and high magnetic flux density.
- all circumference average in the plate surface omnidirectional average
- various techniques have been proposed so far, it is difficult to obtain sufficient magnetic characteristics in all directions in the plate surface. For example, even if sufficient magnetic characteristics can be obtained in a specific direction within the plate surface, sufficient magnetic characteristics may not be obtained in other directions.
- Patent Document 3 discloses a technique for developing ⁇ 100 ⁇ crystal grains by utilizing phase transformation for the purpose of improving magnetic properties.
- this method it is necessary to increase the plate thickness after hot rolling to about 4 mm as in the example of Patent Document 3. This thickness makes it difficult to wind the hot-rolled steel sheet after hot-rolling, and there is a problem that winding in the pickling process and line operation become difficult.
- an object of the present invention is to provide a non-oriented electrical steel sheet capable of obtaining excellent magnetic characteristics with an all-around average (omnidirectional average).
- the non-oriented electrical steel sheet according to one aspect of the present invention is by mass% C: 0.010% or less, Si: 1.50% to 4.00%, sol. Al: 0.0001% to 1.0%, S: 0.010% or less, N: 0.010% or less, One or more selected from the group consisting of Mn, Ni, Co, Pt, Pb, Cu, Au: 2.50% to 5.00% in total, Sn: 0.000% to 0.400%, Sb: 0.000% to 0.400%, P: 0.000% to 0.400%, and one or more selected from the group consisting of Mg, Ca, Sr, Ba, Ce, La, Nd, Pr, Zn, Cd: 0.0000% in total Contains ⁇ 0.0100%, Mn content (mass%) is [Mn], Ni content (mass%) is [Ni], Co content (mass%) is [Co], Pt content (mass%) is [Pt], Pb content The amount (mass%) is [Pb], the Cu content (mass%) is [Cu], the Au content
- the Al content (% by mass) was changed to [sol.
- [Al] is set, the following equation (1) is satisfied.
- the balance has a chemical composition of Fe and impurities It has a metal structure with a recrystallization rate of 1% to 99% and a plate thickness of 0.50 mm or less.
- the magnetic flux density B50 is measured after annealing at 800 ° C. for 2 hours, the magnetic flux density B50 in the 45 ° direction with respect to the rolling direction is 1.75 T or more. ([Mn] + [Ni] + [Co] + [Pt] + [Pb] + [Cu] + [Au])-([Si] + [sol.Al])> 0% ...
- the recrystallization rate may be 50% to 99%.
- the recrystallization rate may be 80% to 99%.
- the present inventors came up with the present invention as a result of further diligent studies based on such findings.
- the chemical composition of the non-oriented electrical steel sheet according to the embodiment of the present invention and the steel material used in the manufacturing method thereof will be described.
- “%” which is a unit of the content of each element contained in non-oriented electrical steel sheets or steel materials, means “mass%” unless otherwise specified.
- the chemical composition of the non-oriented electrical steel sheet shows the content when the base material excluding the film or the like is 100%.
- the non-oriented electrical steel sheet and steel material according to the present embodiment have a chemical composition capable of causing a ferrite-austenite transformation (hereinafter, ⁇ - ⁇ transformation), and have a C: 0.010% or less and Si: 1.50% or more. 4.00%, sol.
- Al 0.0001% to 1.0%, S: 0.010% or less, N: 0.010% or less, Mn, Ni, Co, Pt, Pb, Cu, Au
- Sn 0.000% to 0.400%
- Sb 0.000% to 0.400%
- P 0.000% to 0.400%
- Mg a chemical composition consisting of Fe and impurities.
- the non-oriented electrical steel sheets and steel materials according to this embodiment are further described in Mn, Ni, Co, Pt, Pb, Cu, Au, Si and sol.
- the Al content satisfies a predetermined condition described later.
- impurities include those contained in raw materials such as ore and scrap, and those contained in the manufacturing process.
- C (C: 0.010% or less) C increases iron loss and causes magnetic aging. Therefore, the lower the C content, the better. Such a phenomenon is remarkable when the C content exceeds 0.010%. Therefore, the C content is set to 0.010% or less.
- the reduction of the C content also contributes to the uniform improvement of the magnetic properties in all directions in the plate surface.
- the lower limit of the C content is not particularly limited, it is preferably 0.0005% or more in consideration of the cost of decarburization treatment at the time of refining.
- Si 1.50% to 4.00% Si increases the electrical resistance, reduces the eddy current loss, reduces the iron loss, increases the yield ratio, and improves the punching workability to the iron core. If the Si content is less than 1.50%, these effects cannot be sufficiently obtained. Therefore, the Si content is 1.50% or more. On the other hand, when the Si content exceeds 4.00%, the magnetic flux density decreases, the punching workability decreases due to an excessive increase in hardness, and cold rolling becomes difficult. Therefore, the Si content is set to 4.00% or less.
- sol.Al 0.0001% to 1.0% sol.
- Al increases electrical resistance, reduces eddy current loss, and reduces iron loss.
- sol. Al also contributes to the improvement of the relative magnitude of the magnetic flux density B50 with respect to the saturation magnetic flux density. sol. If the Al content is less than 0.0001%, these effects cannot be sufficiently obtained. Al also has a desulfurization promoting effect in steelmaking. Therefore, sol. The Al content is 0.0001% or more. On the other hand, sol. When the Al content exceeds 1.0%, the magnetic flux density is lowered, the yield ratio is lowered, and the punching workability is lowered. Therefore, sol. The Al content is 1.0% or less.
- the magnetic flux density B50 is the magnetic flux density in a magnetic field of 5000 A / m.
- S is not an essential element and is contained as an impurity in steel, for example. S inhibits recrystallization and grain growth during annealing due to the precipitation of fine MnS. Therefore, the lower the S content, the better. The increase in iron loss and the decrease in magnetic flux density due to the inhibition of recrystallization and grain growth are remarkable when the S content exceeds 0.010%. Therefore, the S content is set to 0.010% or less.
- the lower limit of the S content is not particularly limited, it is preferably 0.0003% or more in consideration of the cost of desulfurization treatment at the time of refining.
- N 0.010% or less Since N deteriorates the magnetic properties as in C, the lower the N content, the better. Therefore, the N content is 0.010% or less.
- the lower limit of the N content is not particularly limited, it is preferably 0.0010% or more in consideration of the cost of denitrification treatment at the time of refining.
- Mn, Ni, Co, Pt, Pb, Cu, Au are elements necessary for causing ⁇ - ⁇ transformation, at least one or more of these elements are contained in a total of 2.50% or more. Need to be included. Further, the content of these elements is more preferably more than 2.50% in total for at least one or a plurality of these elements from the viewpoint of increasing the electric resistance and reducing the iron loss. On the other hand, if the total content of these elements exceeds 5.00%, the cost becomes high and the magnetic flux density may decrease. Therefore, at least one of these elements should be 5.00% or less in total.
- the non-oriented electrical steel sheet and the steel material according to the present embodiment are further satisfied with the following conditions as conditions under which ⁇ - ⁇ transformation can occur. That is, the Mn content (mass%) is [Mn], the Ni content (mass%) is [Ni], the Co content (mass%) is [Co], and the Pt content (mass%) is [Pt].
- Pb content (mass%) is [Pb]
- Cu content (mass%) is [Cu]
- Au content (mass%) is [Au]
- Si content (mass%) is [Si] sol.
- the Al content (% by mass) was changed to [sol. When it is set to Al], it is assumed that the following equation (1) is satisfied in terms of mass%.
- Sn and Sb improve the texture after cold rolling and recrystallization, and improve the magnetic flux density thereof. Therefore, these elements may be contained if necessary, but if they are contained in an excessive amount, the steel is embrittled. Therefore, both the Sn content and the Sb content are set to 0.400% or less. Further, P may be contained in order to secure the hardness of the steel sheet after recrystallization, but if it is excessively contained, it causes embrittlement of the steel. Therefore, the P content is set to 0.400% or less.
- Mg, Ca, Sr, Ba, Ce, La, Nd, Pr, Zn, and Cd react with S in the molten steel during casting to form sulfides, acid sulfides or both precipitates.
- Mg, Ca, Sr, Ba, Ce, La, Nd, Pr, Zn and Cd may be collectively referred to as "coarse precipitate-forming element".
- the particle size of the precipitate of the coarse precipitate-forming element is about 1 ⁇ m to 2 ⁇ m, which is much larger than the particle size of fine precipitates such as MnS, TiN, and AlN (about 100 nm). Therefore, these fine precipitates adhere to the precipitates of coarse precipitate-forming elements, and it becomes difficult to inhibit recrystallization and growth of crystal grains in annealing such as intermediate annealing.
- the total amount of coarse precipitate-forming elements is preferably 0.0005% or more.
- the total amount of these elements exceeds 0.0100%, the total amount of sulfide, acid sulfide, or both of them becomes excessive, and recrystallization and grain growth in annealing such as intermediate annealing are inhibited. Therefore, the total content of the coarse precipitate-forming element is 0.0100% or less.
- the non-oriented electrical steel sheet according to this embodiment has a chemical composition capable of causing ⁇ - ⁇ transformation, and when hot rolling is completed and then cooled, austenite is changed to ferrite. It transforms and the crystal structure becomes finer.
- the non-oriented electrical steel sheet of the present embodiment has a metal structure having a recrystallization rate of 1% to 99%. Leaving a part of unrecrystallized crystals in this way further improves the magnetic flux density B50. The reason for controlling in this way is to reduce the abundance ratio of recrystallized grains having a crystal orientation other than the ⁇ 100 ⁇ crystal orientation that is desired to be developed from the viewpoint of magnetic properties.
- the recrystallization rate is preferably 55% to 95%, and more preferably 80% to 90%.
- the thickness of the non-oriented electrical steel sheet according to this embodiment is 0.50 mm or less. If the thickness exceeds 0.50 mm, excellent high-frequency iron loss cannot be obtained. Therefore, the thickness is set to 0.50 mm or less. Further, from the viewpoint of facilitating production, the thickness of the non-oriented electrical steel sheet according to the present embodiment is more preferably 0.10 mm or more.
- the non-oriented electrical steel sheet according to the present embodiment may have a strain distribution so that a high magnetic flux density can be obtained in all directions as a whole.
- the area ratio of the ⁇ 100 ⁇ orientation grain is Sac
- the area ratio of the ⁇ 110 ⁇ orientation grain is Sag
- the area ratio of 100 ⁇ azimuth grains is Sbc
- the area ratio of ⁇ 110 ⁇ azimuth grains in the same region is Sbg
- Sac> Sbc> Sag> Sbg it is more preferable that Sac> Sbc> Sag> Sbg.
- the ⁇ 100 ⁇ crystal grain (or ⁇ 110 ⁇ crystal grain) is a crystal grain defined within 10 ° of tolerance from the target crystal orientation.
- the ⁇ 100 ⁇ crystal grain (or ⁇ 110 ⁇ crystal grain, etc.) and the ⁇ 100 ⁇ directional grain (or ⁇ 110 ⁇ directional grain, etc.) have the same meaning.
- the area ratio of crystal grains on the polished surface of the material polished so that the plate thickness of the steel plate is halved can be obtained by, for example, the EBSD method.
- the KAM value can be obtained by calculating IPF (Inverse Pole Figure) from the observation field of view of EBSD.
- the KAM value indicates the orientation difference between a certain measurement point and an adjacent measurement point within the same grain.
- the KAM value becomes high in places where there is a lot of distortion.
- the measurement point is an area composed of arbitrary pixels.
- the region from the high KAM side to 20% means the region occupying the frequency from the high KAM side to 20% in the graph obtained by converting the frequency diagram of the KAM value into the cumulative frequency diagram.
- Sac> Sag in the above inequality indicates that the proportion of ⁇ 100 ⁇ directional grains is larger than that of ⁇ 110 ⁇ directional grains. Annealing after the skin pass facilitates the growth of both ⁇ 100 ⁇ oriented grains and ⁇ 110 ⁇ oriented grains.
- the magnetic characteristics of the whole circumference average of the ⁇ 100 ⁇ directional grain are superior to those of the ⁇ 110 ⁇ directional grain, it is more preferable to increase the number of the ⁇ 100 ⁇ directional grain.
- Sbc> Sbg in the high strain region indicates that the proportion of ⁇ 100 ⁇ directional grains is larger than that of ⁇ 110 ⁇ directional grains. Annealing after the skin pass facilitates the growth of both ⁇ 100 ⁇ oriented grains and ⁇ 110 ⁇ oriented grains.
- Sbc> Sbg in the high strain region indicates that the proportion of ⁇ 100 ⁇ directional grains is larger than that of ⁇ 110 ⁇ directional grains.
- Sac> Sbc means that there are relatively few regions with a lot of distortion in the ⁇ 100 ⁇ orientation grain. It is known that in the annealing after the skin pass, the grains with less strain eat the grains with more strain. Therefore, this inequality means that ⁇ 100 ⁇ oriented grains are likely to grow.
- the KAM value is a value measured by the EBSD method, and the KAM value at a portion having a lot of distortion is higher than that around the portion. The same applies to the relationship of Sag> Sbg.
- the magnetic characteristics of the non-oriented electrical steel sheet according to this embodiment will be described.
- the magnetic flux density is measured after the non-oriented electrical steel sheet according to the present embodiment is further annealed at 800 ° C. for 2 hours.
- the non-oriented electrical steel sheet according to the present embodiment has the best magnetic characteristics in two directions in which the smaller angle of the rolling direction is 45 °.
- the magnetic characteristics are the worst in the two directions in which the angles formed with the rolling direction are 0 ° and 90 °.
- the "45 °" is a theoretical value, and it may not be easy to match it with 45 ° in actual manufacturing.
- the magnetic characteristics in the two directions having the best magnetic characteristics are the same, but in actual manufacturing, it may not be easy to make the magnetic characteristics in the two directions the same. Therefore, theoretically, if the magnetic properties in the two directions having the best magnetic properties are the same, the "same” includes those that are not (exactly) the same. This is also the case in the two directions with the worst magnetic properties.
- the above angles are expressed assuming that the angles in both the clockwise and counterclockwise directions have positive values. When the clockwise direction is a negative direction and the counterclockwise direction is a positive direction, the two directions in which the smaller angle of the above-mentioned rolling directions is 45 ° are the above-mentioned rolling directions.
- the angle with the smaller absolute value is 45 ° and ⁇ 45 ° in two directions. Further, the two directions in which the smaller angle formed with the rolling direction is 45 ° can be described as two directions in which the angles formed with the rolling direction are 45 ° and 135 °.
- the magnetic flux density B50 (corresponding to B50D1 and B50D2) in the 45 ° direction with respect to the rolling direction is 1.75T or more.
- the magnetic flux density in the 45 ° direction with respect to the rolling direction is high, but a high magnetic flux density can be obtained even in the all-around average (omnidirectional average).
- the value of the magnetic flux density B50 in the rolling direction after being annealed at 800 ° C. for 2 hours is B50L
- the value of the magnetic flux density B50 in the direction inclined by 45 ° from the rolling direction is B50D1.
- B50C the value of the magnetic flux density B50 in the direction inclined by 90 ° from the rolling direction
- B50D2 the value of the magnetic flux density B50 in the direction inclined by 135 ° from the rolling direction
- B50D1 and B50D2 are the highest
- B50L and B50C are the lowest. Anisotropy of magnetic flux density is observed.
- the rolling directions are 0 ° (one direction) and 180.
- B50D1 is the value of the magnetic flux densities B50 of 45 ° and 225 °
- B50D2 is the value of the magnetic flux densities B50 of 135 ° and 315 °.
- B50L is the value of the magnetic flux densities B50 of 0 ° and 180 °
- B50C is the value of the magnetic flux densities B50 of 90 ° and 270 °.
- B50D1 and B50D2 may not exactly match because it may not be easy to make the magnetic characteristics the same in actual manufacturing.
- B50L and B50C may not exactly match.
- one of the rolling directions and the other cannot be distinguished. Therefore, in the present embodiment, the rolling direction means both one and the other.
- non-oriented electrical steel sheet according to the present embodiment can be more preferably used as a split iron core type motor material by satisfying the following equation (3).
- the magnetic flux density can be measured by cutting out a 55 mm square sample from the rolling direction such as 45 ° and 0 ° and using a single plate magnetic measuring device.
- the steel material is heated and hot-rolled.
- the steel material is, for example, a slab manufactured by ordinary continuous casting.
- Rough rolling and finish rolling of hot rolling are performed at a temperature in the ⁇ region (Ar1 temperature or higher). That is, it is preferable to perform hot rolling so that the temperature (finishing temperature) when passing through the final pass of finish rolling is Ar1 temperature or higher.
- the crystal structure is refined by transforming austenite to ferrite by subsequent cooling. If cold rolling is subsequently performed in a state where the crystal structure is refined, bulging is likely to occur, and ⁇ 100 ⁇ crystal grains that are normally difficult to grow can be easily grown.
- the Ar1 temperature is obtained from the change in thermal expansion of the steel material (steel plate) being cooled at an average cooling rate of 1 ° C./sec. Further, in the present embodiment, the Ac1 temperature is obtained from the change in thermal expansion of the steel material (steel plate) being heated at an average heating rate of 1 ° C./sec.
- the temperature at the time of winding is preferably more than 250 ° C and 600 ° C or less.
- the temperature at the time of winding is more preferably 400 ° C. to 500 ° C., further preferably 400 ° C. to 480 ° C.
- the hot-rolled steel sheet is cold-rolled.
- the rolling reduction is preferably 80% to 92%. The higher the rolling reduction ratio, the easier it is for ⁇ 100 ⁇ crystal grains to grow due to subsequent bulging, but it becomes more difficult to wind the hot-rolled steel sheet and the operation becomes more difficult.
- the recrystallization rate is set to 1% to 99% by controlling the intermediate annealing temperature to be lower than the Ac1 temperature. If the intermediate annealing temperature is too low, recrystallization may not occur and bulging may not occur. Therefore, ⁇ 100 ⁇ crystal grains may not grow sufficiently and the magnetic flux density may not increase. Therefore, the temperature of intermediate annealing is preferably 600 ° C. or higher. Further, when the intermediate annealing temperature is Ac1 temperature or higher, the recrystallization rate of ferrite is close to 100%, but the presence of recrystallized grains having a crystal orientation other than the ⁇ 100 ⁇ crystal orientation that should be developed from the viewpoint of magnetic characteristics.
- the magnetic flux density is not high. Balging occurs by performing intermediate annealing, and ⁇ 100 ⁇ crystal grains are likely to grow. However, in the present embodiment, ⁇ 100 ⁇ crystal grains are further grown by further mixing unrecrystallized and recrystallized. Can be done.
- the intermediate annealing time is preferably 5 to 60 seconds.
- the recrystallization rate is preferably 50% or more at the time after intermediate annealing from the viewpoint that ⁇ 100 ⁇ oriented grains are more likely to grow after finish annealing or strain relief annealing.
- the rolling reduction of skin pass rolling is preferably 5% to 25%, and from the viewpoint of obtaining anisotropy with high magnetic flux density, the rolling reduction of skin pass rolling is more preferably 5% to 15%.
- the rolling reduction rate (%) for cold rolling is Rm and the rolling reduction rate (%) for skin pass rolling is Rs. , 86 ⁇ Rm + 0.2 ⁇ Rs ⁇ 92, and it is preferable to adjust the rolling reduction of cold rolling and skin pass rolling so as to satisfy 5 ⁇ Rs ⁇ 20.
- non-oriented electrical steel sheets are molded to obtain desired steel members. Then, in order to remove the strain or the like generated by the forming process (for example, punching) of the steel member made of the non-oriented electrical steel sheet, the steel member may be subjected to strain relief annealing.
- the temperature of the strain annealing is about 800 ° C. and the time of the strain annealing is about 2 hours.
- the non-oriented electrical steel sheet according to this embodiment can be manufactured.
- the steel member made of non-oriented electrical steel sheets according to this embodiment is applied to, for example, the iron core (motor core) of a rotary electric machine.
- individual flat plate-shaped thin plates are cut out from the non-oriented electrical steel sheets according to the present embodiment, and these flat plate-shaped thin plates are appropriately laminated to produce an iron core used for a rotary electric machine. Since a non-oriented electrical steel sheet having excellent magnetic characteristics is applied to this iron core, iron loss is suppressed to a low level, and a rotary electric machine having excellent torque is realized.
- the steel member made of non-oriented electrical steel sheets according to the present embodiment can be applied to products other than the iron cores of rotary electric machines, for example, iron cores such as linear motors and stationary machines (reactors and transformers).
- non-oriented electrical steel sheet according to the embodiment of the present invention will be specifically described with reference to examples.
- the examples shown below are merely examples of the non-oriented electrical steel sheets according to the embodiment of the present invention, and the non-oriented electrical steel sheets according to the present invention are not limited to the following examples.
- the scale was removed from the hot-rolled steel sheet by pickling, and cold rolling was performed until the plate thickness was 1.1 times the target plate thickness (0.110 to 0.550 mm). Then, intermediate annealing was performed for 30 seconds in a non-oxidizing atmosphere, and the temperature of intermediate annealing was controlled in the range of 550 to 800 ° C. so as to obtain the recrystallization rate shown in Table 1. Next, a second cold rolling (skin pass rolling) was performed until the target plate thickness (0.10 to 0.50 mm) was reached. However, No. 117 was cold-rolled to a thickness of 0.360 mm, and after intermediate annealing, a second cold-roll was performed until it became 0.35 mm.
- strain relief annealing was performed at 800 ° C. for 2 hours, and the magnetic flux density B50 was measured.
- a 55 mm square sample was taken in two directions of 0 ° and 45 ° in the rolling direction.
- the magnetic flux densities B50 of these two types of samples are measured, the value of the magnetic flux density B50 in the direction inclined by 45 ° with respect to the rolling direction is set to B50D1, and the magnetic flux density B50 in the direction inclined by 135 ° with respect to the rolling direction.
- the value was B50D2, the value of the magnetic flux density B50 in the rolling direction was B50L, and the value of the magnetic flux density B50 in the direction inclined by 90 ° with respect to the rolling direction was B50C. Further, the average value of B50D1, B50D2, B50L, and B50C was taken as the all-around average of the magnetic flux density B50.
- the scale was removed from the hot-rolled steel sheet by pickling, and cold rolling was performed at a rolling reduction of 85% until the sheet thickness became 0.385 mm. Then, intermediate annealing was performed for 30 seconds in a non-oxidizing atmosphere, and the temperature of intermediate annealing was controlled so that the recrystallization rate was 85%. Then, a second cold rolling (skin pass rolling) was performed until the plate thickness became 0.35 mm at a rolling reduction of 9%. However, No. 215 was cold-rolled to a thickness of 0.360 mm, and after intermediate annealing, a second cold-roll was performed until it became 0.35 mm.
- strain relief annealing was performed at 800 ° C. for 2 hours, and the magnetic flux density B50 in each direction and the magnetic flux density in each direction were as in the first embodiment.
- the iron loss W10 / 400 was measured.
- the magnetic flux density B50 was measured in the same procedure as in the first embodiment.
- the iron loss W10 / 400 was measured as the energy loss (W / kg) of the whole circumference average generated in the sample when an alternating magnetic field of 400 Hz was applied so that the maximum magnetic flux density was 1.0 T.
- the scale was removed from the hot-rolled steel sheet by pickling, and cold rolling was performed at a rolling reduction of 85% until the sheet thickness became 0.385 mm. Then, intermediate annealing was performed for 30 seconds in a non-oxidizing atmosphere, and the temperature of intermediate annealing was controlled so that the recrystallization rate was 85%. Then, a second cold rolling (skin pass rolling) was performed until the plate thickness became 0.35 mm at a rolling reduction of 9%.
- strain relief annealing was performed at 800 ° C. for 2 hours, and the magnetic flux density B50 and the iron loss W10 / 400 were measured.
- the magnetic flux density B50 in each direction was measured by the same procedure as in the first embodiment.
- the iron loss W10 / 400 was measured as the energy loss (W / kg) of the whole circumference average generated in the sample when an alternating magnetic field of 400 Hz was applied so that the maximum magnetic flux density was 1.0 T.
- the underlined in Table 6 shows the conditions outside the scope of the present invention.
- No. which is an example of the invention.
- the magnetic flux density B50 was a good value in both the 45 ° direction and the all-around average.
- the magnetic density B50 was low and less than 1.75 T because the take-up temperature was out of the optimum range.
- the chemical composition, hot rolling conditions, cold rolling conditions, annealing conditions and recrystallization rate are appropriately controlled.
- the present invention it is extremely useful in industry because it is possible to provide a non-oriented electrical steel sheet capable of obtaining excellent magnetic properties with an all-around average (omnidirectional average).
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Abstract
Description
本願は、2019年11月15日に、日本に出願された特願2019-206709号、並びに、2019年11月15日に、日本に出願された特願2019-206813号、に基づき優先権を主張し、その内容をここに援用する。
質量%で、
C:0.010%以下、
Si:1.50%~4.00%、
sol.Al:0.0001%~1.0%、
S:0.010%以下、
N:0.010%以下、
Mn、Ni、Co、Pt、Pb、Cu、Auからなる群から選ばれる1種又は複数種:総計で2.50%~5.00%、
Sn:0.000%~0.400%、
Sb:0.000%~0.400%、
P:0.000%~0.400%、及び
Mg、Ca、Sr、Ba、Ce、La、Nd、Pr、Zn、Cdからなる群から選ばれる1種又は複数種:総計で0.0000%~0.0100%を含有し、
Mn含有量(質量%)を[Mn]、Ni含有量(質量%)を[Ni]、Co含有量(質量%)を[Co]、Pt含有量(質量%)を[Pt]、Pb含有量(質量%)を[Pb]、Cu含有量(質量%)を[Cu]、Au含有量(質量%)を[Au]、Si含有量(質量%)を[Si]、sol.Al含有量(質量%)を[sol.Al]としたときに、以下の(1)式を満たし、
残部がFeおよび不純物からなる化学組成を有し、
再結晶率が1%~99%である金属組織で、かつ、板厚が0.50mm以下であり、
800℃で2時間焼鈍した後に磁束密度B50を測定した場合に、圧延方向に対して45°方向の磁束密度B50が1.75T以上であることを特徴とする。
([Mn]+[Ni]+[Co]+[Pt]+[Pb]+[Cu]+[Au])-([Si]+[sol.Al])>0% ・・・(1)
800℃で2時間焼鈍した後の、圧延方向における磁束密度B50の値をB50L、圧延方向から45°傾いた方向における磁束密度B50の値をB50D1、圧延方向から90°傾いた方向における磁束密度B50の値をB50C、圧延方向から135°傾いた方向における磁束密度B50の値をB50D2としたときに、以下の(2)式を満たしてもよい。
(B50D1+B50D2)/2>(B50L+B50C)/2・・・(2)
(3)上記(2)に記載の無方向性電磁鋼板では、
以下の(3)式を満たしてもよい。
(B50D1+B50D2)/2>1.1×(B50L+B50C)/2・・・(3)
(4)上記(1)から(3)のいずれか1項に記載の無方向性電磁鋼板では、
質量%で、
Sn:0.020%~0.400%、
Sb:0.020%~0.400%、及び
P:0.020%~0.400%
からなる群から選ばれる1種又は複数種を含有してもよい。
(5)上記(1)から(4)のいずれか1項に記載の無方向性電磁鋼板では、
質量%で、Mg、Ca、Sr、Ba、Ce、La、Nd、Pr、Zn、Cdからなる群から選ばれる1種又は複数種:総計で0.0005%~0.0100%を含有してもよい。
(6)上記(1)~(5)のいずれか1項に記載の無方向性電磁鋼板では、
前記金属組織において、再結晶率が50%~99%であってもよい。
(7)上記(1)~(6)のいずれか1項に記載の無方向性電磁鋼板では、
前記金属組織において、再結晶率が80%~99%であってもよい。
Cは、鉄損を高めたり、磁気時効を引き起こしたりする。従って、C含有量は低ければ低いほどよい。このような現象は、C含有量が0.010%超で顕著である。このため、C含有量は0.010%以下とする。C含有量の低減は、板面内の全方向における磁気特性の均一な向上にも寄与する。なお、C含有量の下限は特に限定しないが、精錬時の脱炭処理のコストを踏まえ、0.0005%以上とすることが好ましい。
Siは、電気抵抗を増大させて、渦電流損を減少させ、鉄損を低減したり、降伏比を増大させて、鉄心への打ち抜き加工性を向上したりする。Si含有量が1.50%未満では、これらの作用効果を十分に得られない。従って、Si含有量は1.50%以上とする。一方、Si含有量が4.00%超では、磁束密度が低下したり、硬度の過度な上昇により打ち抜き加工性が低下したり、冷間圧延が困難になったりする。従って、Si含有量は4.00%以下とする。
sol.Alは、電気抵抗を増大させて、渦電流損を減少させ、鉄損を低減する。sol.Alは、飽和磁束密度に対する磁束密度B50の相対的な大きさの向上にも寄与する。sol.Al含有量が0.0001%未満では、これらの作用効果を十分に得られない。また、Alには製鋼での脱硫促進効果もある。従って、sol.Al含有量は0.0001%以上とする。一方、sol.Al含有量が1.0%超では、磁束密度が低下したり、降伏比を低下させて、打ち抜き加工性を低下させたりする。従って、sol.Al含有量は1.0%以下とする。
Sは、必須元素ではなく、例えば鋼中に不純物として含有される。Sは、微細なMnSの析出により、焼鈍における再結晶及び結晶粒の成長を阻害する。従って、S含有量は低ければ低いほどよい。このような再結晶及び結晶粒成長の阻害による鉄損の増加および磁束密度の低下は、S含有量が0.010%超で顕著である。このため、S含有量は0.010%以下とする。なお、S含有量の下限は特に限定しないが、精錬時の脱硫処理のコストを踏まえ、0.0003%以上とすることが好ましい。
NはCと同様に、磁気特性を劣化させるので、N含有量は低ければ低いほどよい。したがって、N含有量は0.010%以下とする。なお、N含有量の下限は特に限定しないが、精錬時の脱窒処理のコストを踏まえ、0.0010%以上とすることが好ましい。
Mn、Ni、Co、Pt、Pb、Cu、Auは、α-γ変態を生じさせるために必要な元素であることから、これらの元素の少なくとも1種又は複数種を総計で2.50%以上含有させる必要がある。また、これらの元素の含有量は、電気抵抗を上げて鉄損を下げるという観点から、これらの元素の少なくとも1種又は複数種を総計で2.50%超とすることがより好ましい。一方で、これらの元素の含有量が総計で5.00%を超えると、コスト高となり、磁束密度が低下する場合もある。したがって、これらの元素の少なくとも1種を総計で5.00%以下とする。
SnやSbは冷間圧延、再結晶後の集合組織を改善して、その磁束密度を向上させる。そのため、これらの元素を必要に応じて含有させてもよいが、過剰に含まれると鋼を脆化させる。したがって、Sn含有量、Sb含有量はいずれも0.400%以下とする。また、Pは再結晶後の鋼板の硬度を確保するために含有させてもよいが、過剰に含まれると鋼の脆化を招く。したがって、P含有量は0.400%以下とする。
Mg、Ca、Sr、Ba、Ce、La、Nd、Pr、Zn及びCdは、溶鋼の鋳造時に溶鋼中のSと反応して硫化物若しくは酸硫化物又はこれらの両方の析出物を生成する。以下、Mg、Ca、Sr、Ba、Ce、La、Nd、Pr、Zn及びCdを総称して「粗大析出物生成元素」ということがある。粗大析出物生成元素の析出物の粒径は1μm~2μm程度であり、MnS、TiN、AlN等の微細析出物の粒径(100nm程度)よりはるかに大きい。このため、これら微細析出物は粗大析出物生成元素の析出物に付着し、中間焼鈍などの焼鈍における再結晶及び結晶粒の成長を阻害しにくくなる。これらの作用効果を十分に得るためには、粗大析出物生成元素の総計が0.0005%以上であることが好ましい。但し、これらの元素の総計が0.0100%を超えると、硫化物若しくは酸硫化物又はこれらの両方の総量が過剰となり、中間焼鈍などの焼鈍における再結晶及び結晶粒の成長が阻害される。従って、粗大析出物生成元素の含有量は総計で0.0100%以下とする。
(a)結晶粒の平均粒径が300μm超のもの。
(b)結晶粒のアスペクト比において(圧延方向の長さ)/(圧延方向から90度の方向の長さ)>2を満たすもの。なお、観察視野は8mm2以上の範囲を観察する。
溶鋼を鋳造することにより、以下の表1に示す成分のインゴットを作製した。その後、作製したインゴットを1150℃まで加熱して熱間圧延を行い、板厚が2.5mmになるように圧延した。そして、仕上げ圧延終了後に水冷し熱間圧延鋼板を巻き取った。この時の仕上げ圧延の最終パスの段階での温度(仕上温度)は830℃であり、すべてAr1温度より大きい温度だった。なお、γ-α変態が起こらないNo.108については、仕上温度を850℃とした。また、巻き取り時の巻取り温度は500℃とした。ここで、表中の「式左辺」とは、前述の(1)式の左辺の値を表している。
溶鋼を鋳造することにより、以下の表3に示す成分のインゴットを作製した。その後、作製したインゴットを1150℃まで加熱して熱間圧延を行い、板厚が2.5mmになるように圧延した。そして、仕上げ圧延終了後に水冷し熱間圧延鋼板を巻き取った。この時の仕上げ圧延の最終パスの段階での仕上温度は830℃であり、すべてAr1温度より大きい温度だった。また、巻き取り時の巻取り温度は500℃とした。
溶鋼を鋳造することにより、以下の表5に示す成分のインゴットを作製した。その後、作製したインゴットを1150℃まで加熱して熱間圧延を行い、板厚が2.5mmになるように圧延した。そして、仕上げ圧延終了後に水冷し熱間圧延鋼板を巻き取った。この時の仕上げ圧延の最終パスの段階での仕上げ温度は830℃であり、すべてAr1温度より大きい温度だった。また、表6に示すそれぞれの巻取り温度で巻き取りを行った。
Claims (7)
- 質量%で、
C:0.010%以下、
Si:1.50%~4.00%、
sol.Al:0.0001%~1.0%、
S:0.010%以下、
N:0.010%以下、
Mn、Ni、Co、Pt、Pb、Cu、Auからなる群から選ばれる1種又は複数種:総計で2.50%~5.00%、
Sn:0.000%~0.400%、
Sb:0.000%~0.400%、
P:0.000%~0.400%、及び
Mg、Ca、Sr、Ba、Ce、La、Nd、Pr、Zn、Cdからなる群から選ばれる1種又は複数種:総計で0.0000%~0.0100%を含有し、
Mn含有量(質量%)を[Mn]、Ni含有量(質量%)を[Ni]、Co含有量(質量%)を[Co]、Pt含有量(質量%)を[Pt]、Pb含有量(質量%)を[Pb]、Cu含有量(質量%)を[Cu]、Au含有量(質量%)を[Au]、Si含有量(質量%)を[Si]、sol.Al含有量(質量%)を[sol.Al]としたときに、以下の(1)式を満たし、
残部がFeおよび不純物からなる化学組成を有し、
再結晶率が1%~99%である金属組織で、かつ、板厚が0.50mm以下であり、
800℃で2時間焼鈍した後に磁束密度B50を測定した場合に、圧延方向に対して45°方向の磁束密度B50が1.75T以上である
ことを特徴とする無方向性電磁鋼板。
([Mn]+[Ni]+[Co]+[Pt]+[Pb]+[Cu]+[Au])-([Si]+[sol.Al])>0% ・・・(1) - 800℃で2時間焼鈍した後の、圧延方向における磁束密度B50の値をB50L、圧延方向から45°傾いた方向における磁束密度B50の値をB50D1、圧延方向から90°傾いた方向における磁束密度B50の値をB50C、圧延方向から135°傾いた方向における磁束密度B50の値をB50D2としたときに、以下の(2)式を満たす
ことを特徴とする請求項1に記載の無方向性電磁鋼板。
(B50D1+B50D2)/2>(B50L+B50C)/2・・・(2) - 以下の(3)式を満たす
ことを特徴とする請求項2に記載の無方向性電磁鋼板。
(B50D1+B50D2)/2>1.1×(B50L+B50C)/2・・・(3) - 質量%で、
Sn:0.020%~0.400%、
Sb:0.020%~0.400%、及び
P:0.020%~0.400%
からなる群から選ばれる1種又は複数種を含有する
ことを特徴とする請求項1から3のいずれか1項に記載の無方向性電磁鋼板。 - 質量%で、Mg、Ca、Sr、Ba、Ce、La、Nd、Pr、Zn、Cdからなる群から選ばれる1種又は複数種:総計で0.0005%~0.0100%を含有する
ことを特徴とする請求項1から4のいずれか1項に記載の無方向性電磁鋼板。 - 前記金属組織において、再結晶率が50%~99%である
ことを特徴とする請求項1から5のいずれか1項に記載の無方向性電磁鋼板。 - 前記金属組織において、再結晶率が80%~99%である
ことを特徴とする請求項1から6のいずれか1項に記載の無方向性電磁鋼板。
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