WO2022139337A1 - 무방향성 전기강판 및 그 제조방법 - Google Patents
무방향성 전기강판 및 그 제조방법 Download PDFInfo
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- WO2022139337A1 WO2022139337A1 PCT/KR2021/019225 KR2021019225W WO2022139337A1 WO 2022139337 A1 WO2022139337 A1 WO 2022139337A1 KR 2021019225 W KR2021019225 W KR 2021019225W WO 2022139337 A1 WO2022139337 A1 WO 2022139337A1
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- steel sheet
- electrical steel
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- 229910000565 Non-oriented electrical steel Inorganic materials 0.000 title claims abstract description 57
- 238000004519 manufacturing process Methods 0.000 title claims description 31
- 238000000034 method Methods 0.000 title claims description 22
- 229910052718 tin Inorganic materials 0.000 claims abstract description 26
- 229910052787 antimony Inorganic materials 0.000 claims abstract description 24
- 229910052802 copper Inorganic materials 0.000 claims abstract description 17
- 239000012535 impurity Substances 0.000 claims abstract description 16
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 15
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 15
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 12
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 10
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 7
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 7
- 238000000137 annealing Methods 0.000 claims description 30
- 229910000831 Steel Inorganic materials 0.000 claims description 24
- 239000010959 steel Substances 0.000 claims description 24
- 239000002244 precipitate Substances 0.000 claims description 16
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 238000005096 rolling process Methods 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- 238000005097 cold rolling Methods 0.000 claims description 7
- 238000009826 distribution Methods 0.000 claims description 7
- 238000005098 hot rolling Methods 0.000 claims description 6
- 238000005336 cracking Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims description 4
- 239000001257 hydrogen Substances 0.000 claims description 4
- 229910052758 niobium Inorganic materials 0.000 claims description 4
- 229910052717 sulfur Inorganic materials 0.000 claims description 4
- 229910052719 titanium Inorganic materials 0.000 claims description 4
- 125000004435 hydrogen atom Chemical class [H]* 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 59
- 239000010410 layer Substances 0.000 description 53
- 230000005389 magnetism Effects 0.000 description 32
- 239000011651 chromium Substances 0.000 description 25
- 229910052742 iron Inorganic materials 0.000 description 25
- 239000010949 copper Substances 0.000 description 24
- 239000011777 magnesium Substances 0.000 description 22
- 239000000463 material Substances 0.000 description 19
- 230000004907 flux Effects 0.000 description 16
- 239000011572 manganese Substances 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 11
- 229910045601 alloy Inorganic materials 0.000 description 9
- 239000000956 alloy Substances 0.000 description 9
- 229910052760 oxygen Inorganic materials 0.000 description 9
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 8
- 150000004767 nitrides Chemical class 0.000 description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 239000010955 niobium Substances 0.000 description 7
- 239000001301 oxygen Substances 0.000 description 7
- 239000010936 titanium Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 229910000976 Electrical steel Inorganic materials 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 5
- 150000001247 metal acetylides Chemical class 0.000 description 5
- 239000002344 surface layer Substances 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 238000005204 segregation Methods 0.000 description 4
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 3
- 238000007792 addition Methods 0.000 description 3
- 230000002542 deteriorative effect Effects 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 230000005381 magnetic domain Effects 0.000 description 3
- 229910052750 molybdenum Inorganic materials 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 238000010301 surface-oxidation reaction Methods 0.000 description 2
- 150000003568 thioethers Chemical class 0.000 description 2
- 239000011135 tin Substances 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910001224 Grain-oriented electrical steel Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- DIMMBYOINZRKMD-UHFFFAOYSA-N vanadium(5+) Chemical group [V+5] DIMMBYOINZRKMD-UHFFFAOYSA-N 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
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Classifications
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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
- H01F1/147—Alloys characterised by their composition
- H01F1/14766—Fe-Si based alloys
- H01F1/14775—Fe-Si based alloys in the form of sheets
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
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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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/76—Adjusting the composition of the atmosphere
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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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- 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
- C21D8/1216—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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- 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
- C21D8/1216—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
- C21D8/1233—Cold rolling
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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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- 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
- C21D8/1272—Final recrystallisation 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
- 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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- 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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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- 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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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- 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
- H01F1/147—Alloys characterised by their composition
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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
- 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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- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Definitions
- One embodiment of the present invention relates to a non-oriented electrical steel sheet and a method for manufacturing the same. Specifically, an embodiment of the present invention relates to a non-oriented electrical steel sheet having improved magnetism by appropriately adjusting the contents of Sb, Sn, Cu, Cr, and Mg, and a method for manufacturing the same.
- Non-oriented electrical steel sheet is mainly used in motors that convert electrical energy into mechanical energy, and in the process, excellent magnetic properties of non-oriented electrical steel sheet are required to exhibit high efficiency.
- eco-friendly technology has been attracting attention, it is considered very important to increase the efficiency of the motor, which accounts for the majority of the total electric energy usage, and for this purpose, the demand for non-oriented electrical steel sheets with excellent magnetic properties is also increasing.
- the magnetic properties of non-oriented electrical steel sheets are mainly evaluated by iron loss and magnetic flux density.
- Core loss refers to energy loss occurring at a specific magnetic flux density and frequency
- magnetic flux density refers to the degree of magnetization obtained under a specific magnetic field. The lower the iron loss, the more energy efficient the motor can be manufactured under the same conditions, and the higher the magnetic flux density, the smaller the motor or the reduction of copper loss. it is important.
- the characteristics of the non-oriented electrical steel sheet to be considered according to the operating conditions of the motor also vary.
- many motors consider W15/50, the iron loss when a 1.5T magnetic field is applied at a commercial frequency of 50Hz, to be the most important.
- not all motors for various purposes consider the W15/50 iron loss as the most important, and they evaluate the iron loss at different frequencies or applied magnetic fields according to the main operating conditions.
- magnetic properties are often important at low magnetic fields of 1.0T or less and high frequencies of 400 Hz or higher. characteristics are evaluated.
- a method commonly used to increase the magnetic properties of a non-oriented electrical steel sheet is to add an alloying element such as Si.
- the specific resistance of the steel can be increased through the addition of such alloying elements, and as the specific resistance increases, the eddy current loss decreases, thereby lowering the total iron loss.
- the amount of Si added increases, the magnetic flux density becomes inferior and brittleness increases.
- the thickness of the electrical steel sheet is made thinner, the iron loss can be reduced, but the reduction in rollability due to brittleness is a fatal problem.
- Elements such as Al and Mn are added to further increase the specific resistance of the steel to produce the highest grade non-oriented electrical steel sheet with excellent magnetic properties.
- High-frequency core loss of 400Hz or higher is important for non-oriented electrical steel sheets used for electric vehicle driving motors.
- the thickness of the steel sheet becomes thinner, the cold reduction rate increases, so the ⁇ 111 ⁇ //ND texture develops, which causes the magnetism to deteriorate.
- the shape of the steel plate cannot be sufficiently controlled, and the thickness deviation in the width direction increases, causing dimensional defects of the motor core.
- the length of the coil increases, which increases the working time of the continuous annealing process, resulting in a decrease in annealing productivity.
- An embodiment of the present invention provides a non-oriented electrical steel sheet and a method for manufacturing the same. Specifically, an embodiment of the present invention provides a non-oriented electrical steel sheet having improved magnetism by appropriately adjusting the contents of Sb, Sn, Cu, Cr, and Mg, and a method for manufacturing the same.
- Non-oriented electrical steel sheet according to an embodiment of the present invention by weight, Si: 3.0 to 4.0%, Al: 0.3 to 1.5%, Mn: 0.1 to 0.6%, at least one of Sn and Sb: 0.006 to 0.1% , C: 0.0015 to 0.0040%, Cr: 0.01 to 0.03%, Cu: 0.003 to 0.008%, and Mg: 0.0005 to 0.0025%, and the balance Fe and unavoidable impurities.
- the non-oriented electrical steel sheet according to an embodiment of the present invention may satisfy Equation 1 below.
- the non-oriented electrical steel sheet according to an embodiment of the present invention may further include 0.0003 to 0.0030 wt %, respectively, of at least one of N, S, Ti, Nb and V.
- the non-oriented electrical steel sheet according to an embodiment of the present invention may further include one or more of P: 0.005 to 0.05 wt%, Mo: 0.001 to 0.01 wt%, and Ni: 0.005 to 0.04 wt%.
- the non-oriented electrical steel sheet according to an embodiment of the present invention may have an average grain size of 55 to 75 ⁇ m.
- an oxide layer is present in an inner direction from the surface of the steel sheet, and the thickness of the oxide layer may be 10 to 50 nm.
- the oxide layer may include 1.0 to 30% by weight of Al and 0.5 to 10.0% by weight of Si.
- a weight ratio of the Al content to the Si content in the oxide layer may be 5 to 20.
- the distribution density of AlN precipitates having a diameter of 10 to 500 nm at a depth within 2 ⁇ m in the inner direction from the surface of the steel sheet may be 3 pieces/mm 2 or less.
- the thickness of the steel plate may be 0.10 to 0.35 mm.
- the method of manufacturing a non-oriented electrical steel sheet according to an embodiment of the present invention is, by weight, Si: 3.0 to 4.0%, Al: 0.3 to 1.5%, Mn: 0.1 to 0.6%, at least one of Sn and Sb: 0.006 to 0.1%, C: 0.0015 to 0.0040%, Cr: 0.01 to 0.03%, Cu: 0.003 to 0.008%, and Mg: 0.0005 to 0.0025%, including the remainder Fe and unavoidable impurities, and satisfying the following formula 1 manufacturing a hot-rolled sheet by hot-rolling the slab; It includes the steps of manufacturing a cold-rolled sheet by cold-rolling the hot-rolled sheet and final annealing of the cold-rolled sheet.
- the finish rolling temperature may be 800° C. or higher.
- the step of annealing the hot-rolled sheet at 850 to 1150° C. may be further included.
- the final annealing may be performed by maintaining the cold-rolled sheet at a cracking temperature of 900° C. or higher for 15 seconds or longer.
- the cold-rolled sheet contains 40% by volume or less of hydrogen (H 2 ) and 60% by volume or more of nitrogen, and may be annealed under an atmosphere having a dew point of 0 to -40°C.
- FIG. 1 is a schematic diagram of a cross-section of a non-oriented electrical steel sheet according to an embodiment of the present invention.
- first, second and third etc. are used to describe, but are not limited to, various parts, components, regions, layers and/or sections. These terms are used only to distinguish one part, component, region, layer or section from another part, component, region, layer or section. Accordingly, a first part, component, region, layer or section described below may be referred to as a second part, component, region, layer or section without departing from the scope of the present invention.
- % means weight %, and 1 ppm is 0.0001 weight %.
- the meaning of further including the additional element means that the remaining iron (Fe) is included by replacing the additional amount of the additional element.
- Non-oriented electrical steel sheet according to an embodiment of the present invention by weight, Si: 3.0 to 4.0%, Al: 0.3 to 1.5%, Mn: 0.1 to 0.6%, at least one of Sn and Sb: 0.006 to 0.1% , C: 0.0015 to 0.0040%, Cr: 0.01 to 0.03%, Cu: 0.003 to 0.008%, Mg: 0.0005 to 0.0025%, and the balance Fe and unavoidable impurities.
- Silicon (Si) serves to increase the resistivity of the material and lower the iron loss. When too little Si is added, the effect of improving iron loss may be insufficient. When Si is added too much, the brittleness of the material is increased, the rolling productivity is sharply lowered, and an oxide layer and an oxide in the surface layer harmful to magnetism can be formed. Accordingly, it may contain 3.0 to 4.0 wt% of Si. More specifically, it may contain 3.1 to 3.8 wt%.
- Aluminum (Al) serves to increase the resistivity of the material and lower the iron loss. If too little Al is added, it may be difficult to obtain a magnetic improvement effect because fine nitride is not formed or the surface oxide layer is not densely formed. When Al is added too much, nitride is formed excessively, which deteriorates magnetism, and causes problems in all processes such as steelmaking and continuous casting, which can greatly reduce productivity. Accordingly, it may contain 0.30 to 1.50 wt% of Al. More specifically, it may include 0.40 to 1.30 wt%.
- Mn Manganese
- Mn improves the iron loss by increasing the specific resistance of the material and serves to form sulfide.
- Mn is added too little, sulfide is formed finely and magnetic deterioration occurs.
- Mn is added too much, fine MnS is excessively precipitated and promotes the formation of ⁇ 111 ⁇ texture unfavorable to magnetism, and the magnetic flux density decreases rapidly.
- Mn may be included in an amount of 0.1 to 0.6% by weight. More specifically, it may contain 0.2 to 0.5 wt%.
- At least one of Sn and Sb 0.006 to 0.100 wt%
- Tin (Sn) and antimony (Sb) segregate on the surface and grain boundaries of the steel sheet to suppress surface oxidation during annealing, prevent diffusion of elements through grain boundaries, and interfere with recrystallization of ⁇ 111 ⁇ //ND orientations to form a texture plays a role in improving
- Sn and Sb are added too little, the toughness may be lowered due to the increase in grain boundary segregation, and thus productivity may be lowered compared to the improvement of magnetism.
- at least one of Sn and Sb may be included in an amount of 0.006 to 0.100 wt%. More specifically, it may include 0.010 to 0.070 wt%.
- At least one of Sn and Sb means the content of Sn or Sb alone, when Sn and Sb are included at the same time, the total amount of Sn and Sb.
- Carbon (C) causes magnetic aging and combines with other impurity elements to form carbides, thereby reducing magnetic properties, so the lower the carbon (C), the better.
- C may contain 0.0015% by weight or more.
- C may be included in an amount of 0.0015 to 0.0040% by weight. More specifically, it may include 0.0020 to 0.0035 wt%.
- Cr chromium
- Cr-based carbides When Cr is added too little, the Al oxide layer is formed too thickly or a round oxide or nitride is formed on the surface to deteriorate magnetism. can Therefore, it may contain 0.0100 to 0.0300 wt% of Cr. More specifically, it may contain 0.0120 to 0.0275 wt% of Cr.
- Copper (Cu) is an element capable of forming sulfides at high temperatures, and when added in a large amount, also affects the composition of the oxide layer on the surface. When an appropriate amount is added, there is an effect of improving magnetism by coarsening fine-sized CuS or MnCuS precipitates. Accordingly, Cu may be included in an amount of 0.0030 to 0.0080 wt %. More specifically, it may include 0.0040 to 0.0077 wt%.
- Mg Magnesium
- Mg is an element that mainly combines with S to form sulfide, and may affect the surface oxide layer of substrate iron. Accordingly, Mg may be included in an amount of 0.0005 to 0.0025% by weight. More specifically, it may include 0.0008 to 0.0020 wt%.
- the non-oriented electrical steel sheet according to an embodiment of the present invention may satisfy Equation 1 below.
- Equation 1 may be 0.68 to 1.95.
- the non-oriented electrical steel sheet according to an embodiment of the present invention may further include 0.0003 to 0.0030 wt %, respectively, of at least one of N, S, Ti, Nb and V.
- Nitrogen (N) not only forms fine AlN precipitates inside the base material, but also forms fine precipitates by combining with other impurities to inhibit grain growth and worsen iron loss, so the lower the amount, the more preferable, and may contain 0.0003 to 0.0030 wt% . More preferably, it may be managed in an amount of 0.0005 to 0.0025% by weight.
- S Sulfur
- MnS, CuS, and (Mn, Cu)S Sulfur (S) forms fine precipitates MnS, CuS, and (Mn, Cu)S to deteriorate magnetic properties and deteriorate hot workability, so it is better to keep it low. Therefore, when it further includes S, it may be included in an amount of 0.0003 to 0.0030 wt%. More specifically, it may include 0.0005 to 0.0025 wt%.
- Titanium (Ti) has a very strong tendency to form precipitates in the steel, and forms fine carbides, nitrides, or sulfides inside the base material to suppress grain growth, thereby deteriorating iron loss. Therefore, the Ti content should be controlled to be 0.004% or less, more preferably 0.002% or less, respectively.
- Niobium forms fine carbides or nitrides inside the base material to inhibit grain growth and magnetic domain wall movement, thereby deteriorating iron loss. Therefore, the Nb content should be controlled to be 0.004% or less, more preferably 0.002% or less, respectively.
- V 0.0003 to 0.0030 wt%
- V Vanadium
- the V content should be controlled to be 0.004% or less, more preferably 0.002% or less, respectively.
- the non-oriented electrical steel sheet according to an embodiment of the present invention may further include at least one of P: 0.005 to 0.05 wt%, Mo: 0.001 to 0.01 wt%, and Ni: 0.005 to 0.04 wt%.
- Phosphorus (P) segregates on the surface and grain boundaries of the steel sheet to suppress surface oxidation during annealing, interferes with the diffusion of elements through grain boundaries, and improves texture by preventing recrystallization of ⁇ 111 ⁇ //ND orientation do. If too little P is added, the effect may not be sufficient. If too much P is added, the hot working properties may be deteriorated, and productivity may be lowered compared to the improvement of the magnetic field. Therefore, when it further includes P, it may include 0.005 to 0.050 wt%. More specifically, it may further include 0.007 to 0.045 wt% of P.
- Molybdenum serves to improve the texture by segregation on the surface and grain boundaries. If too little Mo is added, the ⁇ 111 ⁇ texture may develop and the magnetism may deteriorate. When Mo is added too much, the effect of improving the texture may be reduced by suppressing the segregation of Sn and P. Accordingly, when Mo is further included, it may be included in an amount of 0.001 to 0.01 wt %.
- Nickel serves to increase the ductility of steel and promote segregation of Sn and P. If too much Ni is added, the magnetic flux density may decrease rapidly. Therefore, when Ni is further included, it may be included in an amount of 0.005 to 0.04 wt%.
- the balance contains Fe and unavoidable impurities.
- the unavoidable impurities are impurities mixed in during the steel making step and the manufacturing process of the grain-oriented electrical steel sheet, which are widely known in the relevant field, and thus a detailed description thereof will be omitted.
- the addition of elements other than the alloy components described above is not excluded, and may be included in various ways within the scope of not impairing the technical spirit of the present invention. When additional elements are included, they are included by replacing the remainder of Fe.
- Inevitable impurities may include, for example, B and Zr, and B: 0.002 wt% or less, Zr: 0.005 wt% or less may be managed.
- FIG. 1 shows a cross-section of a non-oriented electrical steel sheet according to an embodiment of the present invention.
- the oxide layer 20 is present in the inner direction from the surface of the electrical steel sheet 100 .
- the electrical steel sheet 100 except for the oxide layer 20 is divided into an electrical steel sheet base material 10 .
- oxygen in the atmosphere penetrates into the steel sheet, so that an oxygen concentration gradient may exist from the surface to the inside.
- the oxide layer 20 and the base material 10 may be divided into an oxide layer 20 having an oxygen content of 40 wt% or more and a base material 10 having an oxygen content of less than 40 wt%.
- the thickness of the divided oxide layer 20 may be 10 to 50 nm.
- the oxide layer 20 contains a large amount of Al diffused and concentrated in the base material 10 in addition to oxygen present due to the penetration of oxygen in the manufacturing process.
- the Si content may be relatively decreased due to the increase in Al and O.
- the oxide layer 20 may include 1.0 to 30% by weight of Al and 0.5 to 10.0% by weight of Si. More specifically, the oxide layer 20 may include O: 40 to 70 wt%, Al: 1 to 30 wt%, Si: 0.5 to 10.0 wt%, and the balance Fe and unavoidable impurities. As such, the Al-enriched oxide layer is formed, thereby suppressing the formation of a round oxide or fine nitride inside the base material, thereby improving magnetism. Similar to O, in the case of Al, there may be a concentration gradient in which the content increases from the base material to the surface direction, and the above-mentioned range means the average content in the oxide layer 20 .
- a weight ratio of the Al content to the Si content in the oxide layer 20 may be 5 to 20. As such, when the amount of Al in the oxide layer 20 is increased, a dense oxide layer is formed to suppress the formation of fine precipitates under the surface layer that may occur during the final annealing process, thereby obtaining excellent magnetic properties. More specifically, the weight ratio of the Al content to the Si content in the oxide layer 20 may be 7.0 to 17.0.
- the non-oriented electrical steel sheet according to an embodiment of the present invention may have an average grain size of 55 to 75 ⁇ m. In the above range, the magnetic properties of the non-oriented electrical steel sheet are more excellent.
- the grain size is calculated as (measured area ⁇ number of grains) 0.5 .
- the grain size may be measured based on a plane parallel to the rolling plane (ND plane), and may be measured in the base material 10 . Specifically, the average grain size may be 60 to 70 ⁇ m.
- the density of AlN precipitates in the surface portion can be lowered.
- the distribution density of AlN precipitates having a diameter of 10 to 500 nm at a depth within 2 ⁇ m in the inner direction from the surface of the steel sheet may be 3 pieces/mm 2 or less.
- the AlN precipitates may have a distribution density of 0.5 to 2.5 pieces/mm 2 .
- the diameter of AlN may be measured based on a plane parallel to the rolling plane (ND plane). The diameter of AlN can be obtained by assuming a circle having the same area as AlN.
- the thickness of the steel plate may be 0.10 to 0.35 mm.
- the optimum alloy composition is suggested, and the properties of the precipitates are improved, thereby improving the magnetism.
- the iron loss (W 10/400 ) of the non-oriented electrical steel sheet is 12.5 W/kg or less, and the magnetic flux density (B 50 ) may be 1.650T or more.
- the iron loss (W 10/400 ) is the iron loss when a magnetic flux density of 1.0T is induced at a frequency of 400HZ.
- the magnetic flux density (B 50 ) is the magnetic flux density induced in a magnetic field of 5000 A/m. More specifically, the iron loss (W 10/400 ) of the non-oriented electrical steel sheet is 11.6 W/kg or less, and the magnetic flux density (B 50 ) may be 1.660T or more.
- a method of manufacturing a non-oriented electrical steel sheet according to an embodiment of the present invention comprises the steps of: manufacturing a hot-rolled sheet by hot rolling a slab; Cold-rolling the hot-rolled sheet to manufacture a cold-rolled sheet and final annealing of the cold-rolled sheet.
- the slab is hot rolled.
- the alloy composition of the slab has been described in the alloy composition of the non-oriented electrical steel sheet, the overlapping description will be omitted. Since the alloy composition is not substantially changed in the manufacturing process of the non-oriented electrical steel sheet, the alloy composition of the non-oriented electrical steel sheet and the slab is substantially the same.
- the slab is in weight%, by weight%, Si: 3.0 to 4.0%, Al: 0.3 to 1.5%, Mn: 0.1 to 0.6%, at least one of Sn and Sb: 0.006 to 0.1%, C: 0.0015 to 0.0040%, Cr: 0.01 to 0.03%, Cu: 0.003 to 0.008%, and Mg: 0.0005 to 0.0025%, and the balance Fe and unavoidable impurities, and may satisfy Equation 1 below.
- the slab may be heated prior to hot rolling.
- the heating temperature of the slab is not limited, but the slab can be heated to 1200° C. or less. If the heating temperature of the slab is too high, precipitates such as AlN, MnS, etc. present in the slab are re-dissolved and then finely precipitated during hot rolling and annealing to suppress grain growth and reduce magnetism.
- a hot-rolled sheet is manufactured by hot-rolling the slab.
- the thickness of the hot-rolled sheet may be 2 to 2.3 mm.
- the finish rolling temperature may be 800° C. or higher. Specifically, it may be 800 to 1000 °C.
- the hot-rolled sheet may be wound at a temperature of 700° C. or less.
- the step of annealing the hot-rolled sheet may be further included.
- the hot-rolled sheet annealing temperature may be 850 to 1150 °C. If the hot-rolled sheet annealing temperature is too low, the structure does not grow or grows fine, so it is not easy to obtain a texture advantageous for magnetism during annealing after cold rolling. If the annealing temperature is too high, magnetic crystal grains may grow excessively and surface defects of the plate may become excessive.
- the annealing of the hot-rolled sheet is performed to increase the orientation favorable to magnetism, if necessary, and may be omitted.
- the annealed hot-rolled sheet can be pickled.
- the hot-rolled sheet is cold-rolled to manufacture a cold-rolled sheet.
- Cold rolling is final rolling to a thickness of 0.1mm to 0.35mm.
- the reduction ratio can be adjusted to 85% or more. More specifically, the reduction ratio may be 85 to 95%. When the reduction ratio is too low, a thickness difference in the width direction of the steel sheet may occur.
- the cold-rolled sheet is final annealed.
- Annealing can be performed by maintaining the cold-rolled sheet at a cracking temperature of 900°C or higher for 15 seconds or longer. Since the iron loss of the non-oriented electrical steel sheet is closely related to the grain size, it can be annealed at an appropriate temperature and time. More specifically, it may be annealed for 30 to 150 seconds at a cracking temperature of 950 to 1100 °C.
- the cold-rolled sheet contains 40% by volume or less of hydrogen (H 2 ) and 60% by volume or more of nitrogen, and may be annealed under an atmosphere having a dew point of 0 to -40°C. Specifically, it may be annealed in an atmosphere containing 5 to 40% by volume of hydrogen and 60 to 95% by volume of nitrogen.
- the average grain size may be 55 to 75 ⁇ m, and all of the processed structures (ie, 99% or more) formed in the previous cold rolling step may be recrystallized.
- an insulating film may be formed.
- the insulating film may be treated with an organic, inorganic, and organic/inorganic composite film, and it is also possible to process with other insulating film materials.
- a slab was prepared from components containing Table 1 and Table 2 and the remainder Fe and unavoidable impurities. This was heated to 1150° C. and hot-rolled at a finishing temperature of 830° C. to prepare a hot-rolled sheet having a thickness of 2.3 mm. The hot-rolled hot-rolled sheet was annealed at 1030°C for 100 seconds, cold-rolled to a thickness of 0.27mm, and recrystallized annealing was performed at 950°C for 88 seconds.
- Table 3 shows the oxide layer thickness, Al and Si content in the oxide layer, AlN distribution density in the surface layer, W10/400 iron loss, and B50 magnetic flux density for each specimen.
- the oxide layer thickness is the average value of the oxide layer thickness measured at 10 or more points of the base material surface layer by processing the specimen with FIB to prepare a smooth cross section, and photographing it at high TEM magnification.
- the surface of the steel sheet was ground by 1 ⁇ m, and the number of AlN was measured for an area of 2500 ⁇ m 2 or more by photographing it at a high TEM magnification, and summarized in Table 3.
- each specimen was cut with a width of 60 mm ⁇ length of 60 mm ⁇ 5 sheets, and the rolling direction and the rolling direction were measured with a single sheet tester, and the average values were shown.
- W10/400 is the iron loss when a magnetic flux density of 1.0T is induced at a frequency of 400Hz
- B50 is the magnetic flux density induced in a magnetic field of 5000A/m.
- A1 contains too little Cr, so that the oxide layer is not properly formed, and AlN is formed in large amount, confirming that the magnetism is inferior.
- A2 contains too little Mg, so that the oxide layer is not properly formed, and AlN is formed in large amount, confirming that the magnetism is inferior.
- Equation 1 the value of Equation 1 is too large, the oxide layer is not properly formed, and a large amount of AlN is formed, confirming that the magnetism is poor.
- Equation 1 contains a large amount of Sn and Sb, the value of Equation 1 is too large, the oxide layer is not properly formed, and it can be confirmed that the AlN is formed in large amount, and the magnetism is inferior.
- B2 contains a large amount of Mg, the oxide layer is not properly formed, and AlN is formed in large amount, confirming that the magnetism is inferior.
- Equation 1 the value of Equation 1 is too small, the oxide layer is not properly formed, and a large amount of AlN is formed, confirming that the magnetism is poor.
- C1 contains a large amount of Cu, so that the oxide layer is not properly formed, and AlN is formed in large amount, confirming that the magnetism is inferior.
- Equation 1 contains a small amount of Sn and Sb, the value of Equation 1 is too small, the oxide layer is not properly formed, and it can be confirmed that the AlN is formed in a large amount, and the magnetism is inferior.
- D1 contains too little Cu, so that the oxide layer is not properly formed, and AlN is formed in a large amount, confirming that the magnetism is inferior.
- D2 contains too much Cr, so that the oxide layer is not properly formed, and a large amount of AlN is formed, confirming that the magnetism is inferior.
- D5 contains too little Al, so that the oxide layer is not properly formed, and it can be confirmed that the magnetism is inferior.
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Abstract
Description
시편번호 | Si [%] |
Al [%] |
Mn [%] |
Sn [ppm] |
Sb [ppm] |
C [ppm] |
Cr [ppm] |
Cu [ppm] |
Mg [ppm] |
A1 | 3.1 | 1.3 | 0.5 | 231 | 21 | 28 | 73 | 53 | 23 |
A2 | 3.1 | 1.3 | 0.5 | 35 | 463 | 28 | 251 | 77 | 2 |
A3 | 3.1 | 1.3 | 0.5 | 37 | 428 | 26 | 128 | 69 | 14 |
A4 | 3.1 | 1.3 | 0.5 | 596 | 48 | 27 | 273 | 56 | 8 |
B1 | 3.4 | 0.95 | 0.3 | 372 | 879 | 23 | 256 | 70 | 19 |
B2 | 3.4 | 0.95 | 0.3 | 146 | 37 | 35 | 114 | 76 | 15 |
B3 | 3.4 | 0.95 | 0.3 | 98 | 85 | 35 | 286 | 77 | 21 |
B4 | 3.4 | 0.95 | 0.3 | 240 | 310 | 34 | 245 | 40 | 8 |
C1 | 3.6 | 0.75 | 0.2 | 281 | 173 | 30 | 225 | 104 | 14 |
C2 | 3.6 | 0.75 | 0.2 | 21 | 27 | 21 | 109 | 36 | 8 |
C3 | 3.6 | 0.75 | 0.2 | 237 | 292 | 29 | 247 | 57 | 14 |
C4 | 3.6 | 0.75 | 0.2 | 69 | 77 | 21 | 127 | 66 | 19 |
D1 | 3.8 | 0.4 | 0.3 | 126 | 118 | 22 | 159 | 17 | 13 |
D2 | 3.8 | 0.4 | 0.3 | 291 | 84 | 22 | 354 | 58 | 18 |
D3 | 3.8 | 0.4 | 0.3 | 75 | 330 | 23 | 124 | 77 | 9 |
D4 | 3.8 | 0.4 | 0.3 | 380 | 120 | 24 | 189 | 64 | 18 |
D5 | 3.8 | 0.01 | 0.3 | 380 | 120 | 24 | 189 | 64 | 18 |
시편번호 | N [ppm] |
S [ppm] |
Ti [ppm] |
Nb [ppm] |
V [ppm] |
[Sn]+[Sb] [%] |
([Sn]+[Sb]) /([Cr]+[Cu]+[Mg]) |
A1 | 16 | 19 | 11 | 19 | 15 | 0.0252 | 1.69 |
A2 | 13 | 9 | 23 | 17 | 21 | 0.0498 | 1.51 |
A3 | 18 | 14 | 24 | 8 | 19 | 0.0465 | 2.2 |
A4 | 17 | 16 | 17 | 18 | 10 | 0.0644 | 1.91 |
B1 | 14 | 18 | 12 | 11 | 23 | 0.1251 | 3.63 |
B2 | 15 | 18 | 9 | 13 | 9 | 0.0183 | 0.89 |
B3 | 9 | 17 | 24 | 19 | 10 | 0.0183 | 0.48 |
B4 | 12 | 15 | 14 | 20 | 21 | 0.0550 | 1.88 |
C1 | 9 | 14 | 24 | 19 | 20 | 0.0454 | 1.32 |
C2 | 11 | 17 | 21 | 23 | 16 | 0.0048 | 0.31 |
C3 | 12 | 20 | 23 | 14 | 12 | 0.0529 | 1.66 |
C4 | 8 | 14 | 17 | 18 | 18 | 0.0146 | 0.69 |
D1 | 8 | 21 | 18 | 9 | 23 | 0.0244 | 1.29 |
D2 | 11 | 12 | 12 | 16 | 11 | 0.0375 | 0.87 |
D3 | 10 | 13 | 12 | 21 | 13 | 0.0405 | 1.93 |
D4 | 20 | 20 | 10 | 9 | 24 | 0.0500 | 1.85 |
D5 | 20 | 20 | 10 | 9 | 24 | 0.0500 | 1.85 |
시편번호 | 산화층 내 Al | 산화층 내 Si | 산화층내 | 산화층 두께 | 표층부 AlN 분포밀도 [개/mm2] | W10/400 | B50 | 비고 |
[%] | [%] | [Al]/[Si] | [nm] | [W/kg] | [T] | |||
A1 | 23 | 1.4 | 16.4 | 70 | 4.2 | 13.1 | 1.652 | 비교예 |
A2 | 22 | 6.4 | 3.4 | 40 | 9.5 | 13.1 | 1.65 | 비교예 |
A3 | 21 | 7.2 | 2.9 | 35 | 5.9 | 12.8 | 1.652 | 비교예 |
A4 | 29 | 2.6 | 11.2 | 25 | 1.8 | 11.1 | 1.661 | 발명예 |
B1 | 24 | 5.7 | 4.2 | 5 | 7.1 | 13 | 1.658 | 비교예 |
B2 | 22 | 0.8 | 27.5 | 20 | 6.3 | 13.1 | 1.654 | 비교예 |
B3 | 27 | 1.2 | 22.5 | 25 | 4.8 | 12.9 | 1.655 | 비교예 |
B4 | 22 | 2.8 | 7.9 | 35 | 1.2 | 11.5 | 1.667 | 발명예 |
C1 | 27 | 1.1 | 24.5 | 20 | 6.5 | 13.2 | 1.664 | 비교예 |
C2 | 29 | 1.3 | 22.3 | 65 | 8.6 | 13.3 | 1.663 | 비교예 |
C3 | 23 | 1.5 | 15.3 | 20 | 1.6 | 11.4 | 1.671 | 발명예 |
C4 | 24 | 2.3 | 10.4 | 15 | 2.1 | 11.5 | 1.672 | 발명예 |
D1 | 25 | 7.1 | 3.5 | 40 | 5.6 | 13.2 | 1.664 | 비교예 |
D2 | 28 | 2.3 | 12.2 | 5 | 4 | 13.3 | 1.664 | 비교예 |
D3 | 27 | 2.7 | 10 | 20 | 0.8 | 11.3 | 1.673 | 발명예 |
D4 | 23 | 3.2 | 7.2 | 30 | 1.3 | 11.6 | 1.672 | 발명예 |
D5 | 0.7 | 28 | 0.025 | 8 | 11.3 | 13.5 | 1.654 | 비교예 |
Claims (15)
- 중량%로, Si : 3.0 내지 4.0%, Al : 0.3 내지 1.5%, Mn : 0.1 내지 0.6%, Sn 및 Sb 중 1종 이상: 0.006 내지 0.1%, C:0.0015 내지 0.0040%, Cr:0.01 내지 0.03%, Cu: 0.003 내지 0.008% 및 Mg: 0.0005 내지 0.0025%를 포함하고, 잔부 Fe 및 불가피한 불순물을 포함하고,하기 식 1을 만족하는 무방향성 전기강판.[식 1]0.66 ≤ ([Sn]+[Sb])/([Cr]+[Cu]+[Mg]) ≤ 2(식 1에서 [Sn], [Sb], [Cr], [Cu] 및 [Mg]는 각각 Sn, Sb, Cr, Cu 및 Mg의 함량(중량%)을 나타낸다.)
- 제1항에 있어서,N, S, Ti, Nb 및 V 중 1종 이상을 각각 0.0003 내지 0.0030 중량% 더 포함하는 무방향성 전기강판.
- 제1항에 있어서,P: 0.005 내지 0.05 중량%, Mo: 0.001 내지 0.01 중량% 및 Ni: 0.005 내지 0.04 중량% 중 1종 이상 더 포함하는 무방향성 전기강판.
- 제1항에 있어서,평균 결정립 입경이 55 내지 75㎛인 무방향성 전기강판.
- 제1항에 있어서,강판 표면으로부터 내부 방향으로 산화층이 존재하고, 산화층의 두께는 10 내지 50nm인 무방향성 전기강판.
- 제5항에 있어서,상기 산화층은 Al을 1.0 내지 30 중량% 및 Si 0.5 내지 10.0 중량% 포함하는 무방향성 전기강판.
- 제5항에 있어서,상기 산화층 내의 Si 함량에 대한 Al 함량의 중량비가 5 내지 20인 무방향성 전기강판.
- 제1항에 있어서,강판 표면으로부터 내부 방향으로 2㎛ 이내의 깊이에서 직경이 10 내지 500nm인 AlN 석출물의 분포밀도가 3개/mm2 이하인 무방향성 전기강판.
- 제1항에 있어서,두께가 0.10 내지 0.35mm인 무방향성 전기강판.
- 중량%로, Si : 3.0 내지 4.0%, Al : 0.3 내지 1.5%, Mn : 0.1 내지 0.6%, Sn 및 Sb 중 1종 이상: 0.006 내지 0.1%, C:0.0015 내지 0.0040%, Cr:0.01 내지 0.03%, Cu: 0.003 내지 0.008% 및 Mg: 0.0005 내지 0.0025%를 포함하고, 잔부 Fe 및 불가피한 불순물을 포함하고, 하기 식 1을 만족하는 슬라브를 열간 압연하여 열연판을 제조하는 단계;상기 열연판을 냉간압연 하여 냉연판을 제조하는 단계 및상기 냉연판을 최종 소둔하는 단계를 포함하는 무방향성 전기강판의 제조방법.[식 1]0.66 ≤ ([Sn]+[Sb])/([Cr]+[Cu]+[Mg]) ≤ 2(식 1에서 [Sn], [Sb], [Cr], [Cu] 및 [Mg]는 각각 상기 슬라브 내 Sn, Sb, Cr, Cu 및 Mg의 함량(중량%)을 나타낸다.)
- 제10항에 있어서,상기 열연판을 제조하는 단계 이전에 슬라브를 1200℃ 이하로 가열하는 단계를 더 포함하는 무방향성 전기강판의 제조방법.
- 제10항에 있어서,상기 열연판을 제조하는 단계에서 마무리 압연 온도는 800℃ 이상인 무방향성 전기강판의 제조방법.
- 제10항에 있어서,상기 열연판을 제조하는 단계 이후, 850 내지 1150℃에서 열연판 소둔 하는 단계를 더 포함하는 무방향성 전기강판의 제조방법.
- 제10항에 있어서,상기 최종 소둔하는 단계는 900℃ 이상의 균열온도로 15초 이상 유지하여 소둔하는 무방향성 전기강판의 제조방법.
- 제10항에 있어서,상기 최종 소둔하는 단계는 수소(H2) 40 부피% 이하 및 질소 60 부피% 이상 포함하고, 이슬점이 0 내지 -40℃인 분위기 하에서 소둔하는 무방향성 전기강판의 제조방법.
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KR20180070951A (ko) * | 2016-12-19 | 2018-06-27 | 주식회사 포스코 | 무방향성 전기강판 및 그 제조방법 |
KR20190118611A (ko) * | 2017-03-30 | 2019-10-18 | 제이에프이 스틸 가부시키가이샤 | 무방향성 전기 강판의 제조 방법, 모터 코어의 제조 방법 및 모터 코어 |
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