WO2017111507A1 - 방향성 전기강판용 절연피막 조성물, 이를 이용한 방향성 전기강판의 절연피막 형성방법, 및 방향성 전기강판 - Google Patents
방향성 전기강판용 절연피막 조성물, 이를 이용한 방향성 전기강판의 절연피막 형성방법, 및 방향성 전기강판 Download PDFInfo
- Publication number
- WO2017111507A1 WO2017111507A1 PCT/KR2016/015117 KR2016015117W WO2017111507A1 WO 2017111507 A1 WO2017111507 A1 WO 2017111507A1 KR 2016015117 W KR2016015117 W KR 2016015117W WO 2017111507 A1 WO2017111507 A1 WO 2017111507A1
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- WO
- WIPO (PCT)
- Prior art keywords
- steel sheet
- grain
- electrical steel
- oriented electrical
- weight
- Prior art date
Links
- 229910001224 Grain-oriented electrical steel Inorganic materials 0.000 title claims abstract description 247
- 238000009413 insulation Methods 0.000 title claims abstract description 29
- 239000000203 mixture Substances 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims description 85
- 239000002105 nanoparticle Substances 0.000 claims abstract description 128
- 239000002245 particle Substances 0.000 claims abstract description 94
- 229910001463 metal phosphate Inorganic materials 0.000 claims abstract description 32
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims abstract description 31
- 229910052914 metal silicate Inorganic materials 0.000 claims abstract description 20
- 229910021503 Cobalt(II) hydroxide Inorganic materials 0.000 claims abstract description 16
- ASKVAEGIVYSGNY-UHFFFAOYSA-L cobalt(ii) hydroxide Chemical compound [OH-].[OH-].[Co+2] ASKVAEGIVYSGNY-UHFFFAOYSA-L 0.000 claims abstract description 16
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910000423 chromium oxide Inorganic materials 0.000 claims abstract description 9
- 238000000137 annealing Methods 0.000 claims description 117
- 239000008199 coating composition Substances 0.000 claims description 74
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 58
- 239000011248 coating agent Substances 0.000 claims description 53
- 238000000576 coating method Methods 0.000 claims description 53
- 229910000831 Steel Inorganic materials 0.000 claims description 44
- 239000010959 steel Substances 0.000 claims description 44
- 238000005097 cold rolling Methods 0.000 claims description 36
- 238000005261 decarburization Methods 0.000 claims description 36
- 229910052742 iron Inorganic materials 0.000 claims description 35
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 29
- 239000000377 silicon dioxide Substances 0.000 claims description 29
- 229910052799 carbon Inorganic materials 0.000 claims description 17
- 239000012535 impurity Substances 0.000 claims description 15
- 229910052709 silver Inorganic materials 0.000 claims description 14
- 239000004332 silver Substances 0.000 claims description 14
- 239000000395 magnesium oxide Substances 0.000 claims description 13
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 13
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 13
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 12
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 12
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 12
- 238000003303 reheating Methods 0.000 claims description 12
- 239000002904 solvent Substances 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 11
- 229910052787 antimony Inorganic materials 0.000 claims description 10
- 238000005098 hot rolling Methods 0.000 claims description 10
- 239000010960 cold rolled steel Substances 0.000 claims description 9
- 239000013078 crystal Substances 0.000 claims description 9
- 229910052739 hydrogen Inorganic materials 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 229910052710 silicon Inorganic materials 0.000 claims description 8
- 238000005096 rolling process Methods 0.000 claims description 7
- 229910052712 strontium Inorganic materials 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- 229910052788 barium Inorganic materials 0.000 claims description 6
- 229910052791 calcium Inorganic materials 0.000 claims description 6
- 229910052749 magnesium Inorganic materials 0.000 claims description 6
- 239000011777 magnesium Substances 0.000 claims description 6
- 229910052748 manganese Inorganic materials 0.000 claims description 6
- 239000011572 manganese Substances 0.000 claims description 6
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 claims description 6
- 229910052726 zirconium Inorganic materials 0.000 claims description 6
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 5
- ASTZLJPZXLHCSM-UHFFFAOYSA-N dioxido(oxo)silane;manganese(2+) Chemical compound [Mn+2].[O-][Si]([O-])=O ASTZLJPZXLHCSM-UHFFFAOYSA-N 0.000 claims description 4
- 229910052917 strontium silicate Inorganic materials 0.000 claims description 4
- QSQXISIULMTHLV-UHFFFAOYSA-N strontium;dioxido(oxo)silane Chemical compound [Sr+2].[O-][Si]([O-])=O QSQXISIULMTHLV-UHFFFAOYSA-N 0.000 claims description 4
- 239000004111 Potassium silicate Substances 0.000 claims description 3
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 claims description 3
- 229910052919 magnesium silicate Inorganic materials 0.000 claims description 3
- 239000000391 magnesium silicate Substances 0.000 claims description 3
- 235000019792 magnesium silicate Nutrition 0.000 claims description 3
- 235000019353 potassium silicate Nutrition 0.000 claims description 3
- NNHHDJVEYQHLHG-UHFFFAOYSA-N potassium silicate Chemical compound [K+].[K+].[O-][Si]([O-])=O NNHHDJVEYQHLHG-UHFFFAOYSA-N 0.000 claims description 3
- 229910052913 potassium silicate Inorganic materials 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims 2
- 125000003118 aryl group Chemical group 0.000 claims 1
- 239000011787 zinc oxide Substances 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 74
- 230000007797 corrosion Effects 0.000 description 28
- 238000005260 corrosion Methods 0.000 description 28
- 230000004907 flux Effects 0.000 description 24
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 20
- 238000010438 heat treatment Methods 0.000 description 14
- 229910000000 metal hydroxide Inorganic materials 0.000 description 14
- 150000004692 metal hydroxides Chemical class 0.000 description 14
- 238000004519 manufacturing process Methods 0.000 description 13
- 230000009467 reduction Effects 0.000 description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 12
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 11
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 10
- 238000005262 decarbonization Methods 0.000 description 10
- 239000002344 surface layer Substances 0.000 description 10
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 8
- 239000001257 hydrogen Substances 0.000 description 8
- 239000010410 layer Substances 0.000 description 8
- ILRRQNADMUWWFW-UHFFFAOYSA-K aluminium phosphate Chemical compound O1[Al]2OP1(=O)O2 ILRRQNADMUWWFW-UHFFFAOYSA-K 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 238000001953 recrystallisation Methods 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- 239000004115 Sodium Silicate Substances 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 5
- 239000011575 calcium Substances 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 5
- 229910052911 sodium silicate Inorganic materials 0.000 description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000005554 pickling Methods 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 229910000859 α-Fe Inorganic materials 0.000 description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000001879 gelation Methods 0.000 description 3
- 239000003966 growth inhibitor Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000691 measurement method Methods 0.000 description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 3
- 239000011574 phosphorus Substances 0.000 description 3
- 229910019142 PO4 Inorganic materials 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 2
- 239000000378 calcium silicate Substances 0.000 description 2
- 229910052918 calcium silicate Inorganic materials 0.000 description 2
- 235000012241 calcium silicate Nutrition 0.000 description 2
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 2
- 229940117975 chromium trioxide Drugs 0.000 description 2
- GAMDZJFZMJECOS-UHFFFAOYSA-N chromium(6+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Cr+6] GAMDZJFZMJECOS-UHFFFAOYSA-N 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 235000019441 ethanol Nutrition 0.000 description 2
- 239000003112 inhibitor Substances 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 235000021317 phosphate Nutrition 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 150000004760 silicates Chemical class 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 125000003698 tetramethyl group Chemical group [H]C([H])([H])* 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 1
- FUFJGUQYACFECW-UHFFFAOYSA-L calcium hydrogenphosphate Chemical compound [Ca+2].OP([O-])([O-])=O FUFJGUQYACFECW-UHFFFAOYSA-L 0.000 description 1
- 239000001506 calcium phosphate Substances 0.000 description 1
- 229910000389 calcium phosphate Inorganic materials 0.000 description 1
- 235000011010 calcium phosphates Nutrition 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000006482 condensation reaction Methods 0.000 description 1
- 239000006071 cream Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- CPSYWNLKRDURMG-UHFFFAOYSA-L hydron;manganese(2+);phosphate Chemical compound [Mn+2].OP([O-])([O-])=O CPSYWNLKRDURMG-UHFFFAOYSA-L 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000010977 jade Substances 0.000 description 1
- GVALZJMUIHGIMD-UHFFFAOYSA-H magnesium phosphate Chemical compound [Mg+2].[Mg+2].[Mg+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O GVALZJMUIHGIMD-UHFFFAOYSA-H 0.000 description 1
- 239000004137 magnesium phosphate Substances 0.000 description 1
- 229910000157 magnesium phosphate Inorganic materials 0.000 description 1
- 229960002261 magnesium phosphate Drugs 0.000 description 1
- 235000010994 magnesium phosphates Nutrition 0.000 description 1
- QQFLQYOOQVLGTQ-UHFFFAOYSA-L magnesium;dihydrogen phosphate Chemical compound [Mg+2].OP(O)([O-])=O.OP(O)([O-])=O QQFLQYOOQVLGTQ-UHFFFAOYSA-L 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 235000019794 sodium silicate Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
- JOPDZQBPOWAEHC-UHFFFAOYSA-H tristrontium;diphosphate Chemical compound [Sr+2].[Sr+2].[Sr+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O JOPDZQBPOWAEHC-UHFFFAOYSA-H 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
- C09D1/02—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances alkali metal silicates
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/66—Additives characterised by particle size
- C09D7/67—Particle size smaller than 100 nm
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/66—Additives characterised by particle size
- C09D7/68—Particle size between 100-1000 nm
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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
-
- 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
- C21D8/1255—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 with diffusion of elements, e.g. decarburising, nitriding
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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
- C21D8/1283—Application of a separating or insulating coating
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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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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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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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/02—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition
- C23C18/12—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material
- C23C18/1204—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material inorganic material, e.g. non-oxide and non-metallic such as sulfides, nitrides based compounds
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/02—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition
- C23C18/12—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material
- C23C18/1204—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material inorganic material, e.g. non-oxide and non-metallic such as sulfides, nitrides based compounds
- C23C18/1208—Oxides, e.g. ceramics
- C23C18/1216—Metal oxides
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/02—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition
- C23C18/12—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material
- C23C18/125—Process of deposition of the inorganic material
- C23C18/1262—Process of deposition of the inorganic material involving particles, e.g. carbon nanotubes [CNT], flakes
- C23C18/127—Preformed particles
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/02—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition
- C23C18/12—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material
- C23C18/125—Process of deposition of the inorganic material
- C23C18/1295—Process of deposition of the inorganic material with after-treatment of the deposited inorganic material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
- H01B3/10—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances metallic oxides
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
- H01B3/12—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances ceramics
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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
- H01F1/18—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 with insulating coating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2289—Oxides; Hydroxides of metals of cobalt
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
Definitions
- Insulation coating composition for grain-oriented electrical steel sheet method for forming insulation coating of grain-oriented electrical steel sheet using same, and grain-oriented electrical steel sheet
- An insulating coating composition for a grain-oriented electrical steel sheet a method for forming an insulation coating of a grain-oriented electrical steel sheet using the same, and a grain-oriented electrical steel sheet.
- a grain-oriented electrical steel sheet is a soft magnetic material having excellent magnetic landing property in the rolling direction, which is composed of grains having a Goss orientation in which the crystal orientation of the steel sheet is ⁇ 110 ⁇ ⁇ 001>.
- These oriented electrical steel sheets are usually rolled to a final thickness of 0.15 to 0.35 mm through hot rolling, hot rolled sheet annealing, and hot rolled after slab heating, followed by hot annealing for primary recrystallization annealing and secondary recrystallization. do.
- the high temperature annealing rate of the grain-oriented electrical steel sheet is less than 15 ° C per hour, it takes only 2 to 3 days as a silver, but also requires more than 40 hours of pure annealing can be said to be a process that consumes a lot of energy.
- the current final high temperature annealing process is subjected to batch annealing in a coil state, the following difficulties occur in the process.
- the temperature difference between the outer and inner coil portions of the coil due to the heat treatment in the coil state is not applicable to the same heat treatment pattern in each portion, and the magnetic deviation of the outer and inner coil portions occurs.
- the surface defects are generated in the process of coating MgO on the surface after decarburization annealing and forming a base coat during hot annealing, the error rate is lowered.
- An insulating coating composition for a grain-oriented electrical steel sheet a method for forming an insulating coating of a grain-oriented electrical steel sheet using the same, and a grain-oriented electrical steel sheet.
- Insulating coating composition for a grain-oriented electrical steel sheet comprises 10 to 50 parts by weight of metal silicate or organic silicate, 20 to 70 parts by weight of inorganic nanoparticles and 0.1 to 20 parts by weight of cobalt hydroxide.
- the metal silicate is at least one selected from sodium silicate, potassium silicate, stag silicate, magnesium silicate, manganese silicate and strontium silicate, and the organic silicate may be tetraalkyl orthosilicate.
- the inorganic nanoparticles are at least one selected from alumina (A1 2 0 3 ), silica (Si0 2 ), titania (Ti0 2 ), zirconia (Zr0 2 ), yttrium oxide (Y 2 0 3 ) and magnesium oxide (MgO). Can be.
- the inorganic nanoparticles may have an average particle diameter of 1 to 100 nm.
- the inorganic nanoparticles may include inorganic nanoparticles having a particle diameter of less than 1 nm to 100 nm and inorganic nanoparticles having a particle diameter of 10 nm to 100 nm.
- the inorganic nanoparticles may include inorganic nanoparticles having a particle diameter of less than 1 nm to 100 nm, inorganic nanoparticles having a particle diameter of less than 10 nm to 30 nm, and inorganic nanoparticles having a particle diameter of 30 nm to 100 nm.
- the solvent may further comprise 10 to 25 parts by weight.
- the metal phosphate may further comprise 10 to 50 parts by weight.
- Insulating film forming method of a grain-oriented electrical steel sheet comprises the steps of preparing an insulating film composition for a grain-oriented electrical steel sheet and a grain-oriented electrical steel sheet, respectively; Applying an insulating coating composition for a grain-oriented electrical steel sheet to a surface of the grain-oriented electrical steel sheet; Heat-treating the grain-oriented electrical steel sheet coated with the insulating coating composition for grain-oriented electrical steel sheet; And obtaining a grain-oriented electrical steel sheet having an insulating coating formed on the surface thereof, wherein the insulation coating composition for a grain-oriented electrical steel sheet includes 10 to 50 parts by weight of metal silicate or organic silicate, 20 to 70 parts by weight of inorganic nanoparticles, and cobalt hydroxide 0. 1 to 20 parts by weight Include. "
- the grain-oriented electrical steel sheet includes, by weight, Si: 2.0 to 4.OT, C: 0.002% or less) and Sb 0.01 to 0.06%, and the balance may be made of Fe and other unavoidable impurities.
- the grain-oriented electrical steel sheet comprises, by weight%, Si: 2.0% to C: 0.1% to 0.4% and Sb: 0.01% to 06%, the remainder providing a slab made of Fe and other unavoidable impurities; Reheating the slab; Hot rolling the slab to produce a hot rolled steel sheet; Annealing the hot rolled steel sheet; Cold rolling the hot rolled hot rolled steel sheet; Decarburizing annealing the cold rolled steel sheet; The steel sheet is decarburization annealing is completed, cold rolling; And final annealing of the steel sheet after the cold rolling has been completed.
- Decarburization annealing can be carried out at temperatures of 850 ° C. to 1000 ° C. and dew point silver of 50 ° C. to 70 ° C.
- Final annealing step is 900 ° C to looor temperature and dew point temperature
- step 1 There claim to a second step carried out in step 1 and KXXrC to 1200 ° C temperature and 75% by volume of at least 3 ⁇ 4 of the atmosphere, to perform annealing at 55 ° C to 65 ° C.
- An insulating coating composition for a grain-oriented electrical steel sheet may be applied to the surface of the grain-oriented electrical steel sheet 0.5 to 7 g / m 2 .
- the grain-oriented electrical steel sheet coated with the insulating coating composition for grain-oriented electrical steel sheet may be heat treated at 250 to 950 ° C.
- Directional electrical steel sheet is a directional electrical steel sheet; And an insulating coating formed on the surface of the grain-oriented electrical steel sheet, wherein the insulating coating includes 10 to 50 parts by weight of metal silicate or organic silicate, 20 to 70 parts by weight of inorganic nanoparticles, and 0.1 to 20 parts by weight of cobalt hydroxide.
- the grain-oriented electrical steel sheet may have a volume fraction of 90% or more with grains having an orientation within 15 degrees from the ⁇ 110 ⁇ ⁇ 001> orientation.
- the ratio of grains having a grain size of 30 to 1000 zm having an orientation within 15 degrees from the ⁇ 110 ⁇ ⁇ 001> orientation may be 8 OT or more.
- Insulation coating composition for a grain-oriented electrical steel sheet according to an embodiment of the present invention is 10 to 50 parts by weight of metal phosphate, 5 to 30 parts by weight of inorganic nanoparticles having a particle diameter of less than lnm to 10nm, 10 to 40 inorganic nanoparticles having a particle diameter of 10nm to 100nm. And an increase of 0.1-20 parts by weight of crust oxide.
- Metal Phosphate is selected from Mg, Al, Ca, Fe, Mn, Sr, Zr and Ba
- It may comprise one or more metals.
- the inorganic nanoparticles having a particle diameter of 10 nm to 100 nm may include 5 to 20 parts by weight of inorganic nanoparticles having a particle diameter of less than 30 nm and onOna 5 to 20 parts by weight of inorganic nanoparticles having a particle diameter of 30 nm to 100 nm.
- the inorganic nanoparticles are at least one selected from alumina (A1 2 0 3 ), silica (Si0 2 ), titania (Ti0 2 ), zirconia (Zr0 2 ), yttrium oxide (Y 2 0 3 ) and magnesium oxide (MgO). Can be.
- the chromium oxide may be at least one selected from chromium trioxide, oxidized cream, and chromium oxide.
- the solvent may further comprise 10 to 25 parts by weight.
- Insulating film forming method of a grain-oriented electrical steel sheet comprises the steps of preparing an insulating film composition for a grain-oriented electrical steel sheet and a grain-oriented electrical steel sheet respectively; Applying an insulating coating composition for a grain-oriented electrical steel sheet to a surface of the grain-oriented electrical steel sheet; Heat-treating the grain-oriented electrical steel sheet coated with the insulating coating composition for grain-oriented electrical steel sheet; And obtaining a grain-oriented electrical steel sheet having an insulating coating formed on its surface.
- the insulating coating composition for grain-oriented electrical steel sheet includes 10 to 50 parts by weight of metal phosphate, and 5 to 30 parts by weight of inorganic nanoparticles having a particle diameter of less than lnm to 10 nm, and a particle size. 10 to 40 parts by weight of the inorganic nanoparticles having 10 nm to 100 nm and 0.1 to 20 parts by weight of chromium oxide.
- the grain-oriented electrical steel sheet includes, by weight, Si: 2.0 to C: 0.002% or less (excluding) and Sb 0.01 to 0.06%, and the balance may be made of Fe and other unavoidable impurities.
- the grain-oriented electrical steel sheet comprises, by weight%, Si: 2. to 4., C: 0.1% to 0.4% and Sb: 0.01% to 0.06%, the remainder providing a slab of Fe and other unavoidable impurities. ; Reheating the slab; Hot rolling the slab to produce a hot rolled steel sheet; Annealing the hot rolled steel sheet; Cold rolling the hot rolled hot rolled steel sheet; Decarburizing annealing the cold rolled steel sheet; Cold rolling the steel sheet on which decarburization annealing is completed; And final annealing of the steel sheet after the cold rolling has been completed.
- Decarburization annealing can be carried out at temperatures of 85 ° C. to loocrc and dew point temperatures of 50 ° C. to 70 ° C.
- the final annealing step is carried out in the first step of annealing at a temperature of 900 ° C to 1000 ° C and a dew point temperature of 55 ° C to 65 ° C and at a temperature of KXXrC to 1200 ° C and an atmosphere of at least 75 vol%
- a second step may be included.
- An insulating coating composition for a grain-oriented electrical steel sheet may be applied to the surface of the grain-oriented electrical steel sheet 0.5 to 7 g / m 2 .
- the grain-oriented electrical steel sheet coated with the insulating coating composition for grain-oriented electrical steel sheet may be heat treated at 250 to 950 ° C.
- Directional electrical steel sheet is a directional electrical steel sheet; And an insulating coating formed on the surface of the grain-oriented electrical steel sheet, wherein the insulating coating includes 10 to 50 parts by weight of metal phosphate, and 5 to 30 parts by weight of inorganic nanoparticles having a particle diameter of less than lnm to 100 nm. To 40 parts by weight and 0.1 to 20 parts by weight of chromium oxide.
- the grain-oriented electrical steel sheet may have a volume fraction of at least 9OT having grain orientations within 15 degrees from the ⁇ 110 ⁇ ⁇ 001> orientation.
- the ratio of the grains having a size of 30 to ⁇ among the grains having an orientation within 15 degrees from the ⁇ 110 ⁇ ⁇ 001> orientation may be 80% or more.
- a method for manufacturing a grain-oriented electrical steel sheet which can be subjected to continuous annealing without performing batch annealing in a coil state at the time of final annealing. That is, it is possible to produce a grain-oriented electrical steel sheet only by annealing for a short time, it is possible to omit the step of winding the cold rolled steel sheet.
- first, second, and third are used to describe various parts, components, regions, layers, and / or sections, but are not limited to these. These terms are only used to distinguish one part, component, region, layer or section from another part, component, region, layer or section. Accordingly, the first portion, component, region, layer or section described below may be referred to as the second portion, component, region, layer or section without departing from the scope of the present invention.
- % means weight% ( ⁇ %).
- Insulating coating composition for a grain-oriented electrical steel sheet comprises 10 to 50 parts by weight of metal silicate or organic silicate, 20 to 70 parts by weight of inorganic nanoparticles and 0.1 to 20 parts by weight of cobalt hydroxide.
- Metal silicates or organic silicates are added to significantly improve the adhesion to the base iron and to impart high tensile strength.
- the metal silicate may be at least one selected from sodium silicate, potassium silicate, calcium silicate, magnesium silicate, manganese silicate and strontium silicate, and the organic silicate may be used. It may be a tetraalkyl orthosilicate, and more specifically, can be at least one selected from tetraethyl orthosilicate (tetraethyl orthosi 1 icate), and tetramethyl ortho-silico "Kate (tetramethyl orthosi 1 icate) increased .
- Metal silicate or organic silicate may be included in 10 to 50 parts by weight. If too little metal silicate or organic silicate is included, the problem of inferior adhesion to the base iron may occur. If too much metal silicate or organic silicate is included, problems of poor corrosion resistance may occur. Therefore, the addition amount of a metal silicate or an organic silicate can be adjusted in the above-mentioned range. When the metal silicate and the organic silicate are included at the same time, the total amount may be 10 to 50 parts by weight.
- Inorganic nanoparticles form a ceramic layer with a low coefficient of thermal expansion during heat treatment of the insulating coating to impart a tensile force to the material.
- the inorganic nanoparticles are 1 selected from alumina (A1 2 0 3 ), silica (Si0 2 ), titania (Ti0 2 ), zirconia (Zr0 2 ), yttrium oxide (Y 2 0 3 ) and magnesium oxide (MgO). It can be more than a species.
- the inorganic nanoparticles may be included in 20 to 70 parts by weight. If the inorganic nanoparticles are contained too little, the ceramic layer may not be formed and a problem of failing to give a tensile tension to the material may occur. If too much inorganic nanoparticles are included, there is a problem that the solid content is increased and the quality of the surface of the grain-oriented electrical steel sheet is degraded. Therefore, in the above range The amount of inorganic nanoparticles added can be controlled.
- the inorganic nanoparticles may have an average particle diameter of 1 to 100 nm. If the average particle diameter of the inorganic nanoparticles is too small, the specific surface area may increase, and the gelation of the solution may proceed rapidly, thereby making it difficult to maintain the properties of the initial solution. If the average particle diameter of the inorganic nanoparticles is too large, the specific surface area may become small, which may cause a problem of slowing the condensation reaction reaction speed. Therefore, the average particle diameter of the inorganic nanoparticles can be adjusted in the above-described range.
- inorganic nanoparticles having different particle diameters of the inorganic nanoparticles It is also possible to use two or more kinds of inorganic nanoparticles having different particle diameters of the inorganic nanoparticles.
- solution properties may be improved by synergy of inorganic nanoparticles having different particle diameters. That is, the stability of the solution can be maintained for a long time by the inorganic nanoparticles having a relatively large particle size, and the surface layering property is improved and the insulating property is also excellent because the inorganic nanoparticles having a large particle size are filled with inorganic nanoparticles having a relatively small particle size. Can be done.
- two types of inorganic nanoparticles may include inorganic nanoparticles having a particle diameter of less than 1 nm to 10 nm and inorganic nanoparticles having a particle diameter of 10 nm to 100 nm. More specifically, the particle diameter may include inorganic nanoparticles having a particle size of less than 1 nm to 10 nm, inorganic nanoparticles having a particle size of less than 10 nm to 30 nm, and inorganic nanoparticles having a particle size of 30 nm to 100 nm.
- Cobalt hydroxide (Co (0H) 2 ) serves to maintain stability by preventing gelation due to the mixing of metal silicates or organic silicates with inorganic nanoparticles.
- Cobalt hydroxide may be included in 0.1 to 20 parts by weight. If the amount of added cobalt hydroxide is too small, a problem of insufficient stability maintenance may occur. If the amount of cobalt hydroxide added is too large, it may adversely affect the pleural properties. Therefore, the addition amount of cobalt hydroxide can be adjusted in the above-mentioned range.
- the insulation coating composition may further include a solvent.
- the solvent serves to improve the stability, spreadability and workability of the insulating coating composition.
- the solvent may be water, ethyl alcohol, isopropyl alcohol, or butanol.
- the solvent may be included in 10 to 25 parts by weight. Stability in the aforementioned range , Spreadability and workability are improved.
- the insulation coating composition may further include a metal phosphate.
- the metal of the metal phosphate may be at least one selected from Mg, Al, Ca, Fe, Mn, Sr, Zr and Ba.
- the metal phosphate may be at least one of monobasic aluminum phosphate, monobasic phosphate, and monobasic phosphate.
- the metal phosphate may be a compound by chemical reaction of metal hydroxide and phosphoric acid (3 ⁇ 4P0 4 ), and the metal of the metal hydroxide is 1 selected from Mg, Al, Ca, Fe, Mn, Sr, Zr, and Ba. It may be more than one species.
- the metal phosphate is a compound in which the metal atom of the metal hydroxide is reacted with phosphorus of phosphoric acid to form a single bond, double bond, or triple bond, and the amount of unbanung free phosphoric acid (H 3 P0 4 ) is 35% or less. It may be made.
- the metal phosphate is composed of a compound by chemical reaction of metal hydroxide and phosphoric acid (3 ⁇ 4PO 4 ), and the weight ratio of metal hydroxide to phosphoric acid may be represented by 1: 100 to 70: 100.
- metal hydroxide is included in more than 70: 100 weight ratio, the chemical reaction is not completed and sediment may occur. If the metal hydroxide is included in less than 1: 100 weight ratio, the corrosion resistance is poor. Since a problem may occur, it is limited to the aforementioned range.
- the metal phosphate salt may contain 10 to 50 parts by weight.
- Insulating coating film forming method of a grain-oriented electrical steel sheet according to another embodiment of the present invention, preparing an insulating film composition for a grain-oriented electrical steel sheet and a grain-oriented electrical steel sheet (S10); Applying an insulating coating composition for a grain-oriented electrical steel sheet to the surface of the grain-oriented electrical steel sheet (S20); Heat-treating the grain-oriented electrical steel sheet coated with the insulating coating composition for grain-oriented electrical steel sheet (S30); And obtaining a grain-oriented electrical steel sheet having an insulating coating formed on its surface (S40).
- the insulating coating composition for a grain-oriented electrical steel sheet 10 to 50 parts by weight of the metal silicate or organic silicate, 20 to 70 parts by weight of inorganic nanoparticles and 0.1 to 20 parts by weight of cobalt hydroxide.
- This corresponds to a method of forming an insulating film on the surface of the grain-oriented electrical steel sheet using the insulating film composition for grain-oriented electrical steel sheet having the above characteristics.
- each step of the method of forming the insulating film of the grain-oriented electrical steel sheet will be described in detail. .
- step (S10) to prepare an insulating coating composition for a grain-oriented electrical steel sheet and a grain-oriented electrical steel sheet, respectively.
- the grain-oriented electrical steel sheet has an increase in%, Si: 2.0 to 4.03 ⁇ 4>, C: 0.002% or less (excluding 0%) and Sb 0.01 to 0.06%, and the balance is composed of Fe and other inevitable impurities. Can be.
- the method for producing a grain-oriented electrical steel sheet includes, by weight, Si: 2.0% to 4.0%, C: 0.01% to 0.4%, and Sb: 0.01% to 0.06%, and the balance is Fe and other unavoidable impurities.
- Silicon (Si) improves iron loss by lowering the magnetic anisotropy of electrical steel sheets and increasing the specific resistance. Iron loss is inferior when the Si content is less than 2.0% by weight, and brittleness is increased when the amount is increased by 4.0% by weight. Therefore, the content of Si in the grain-oriented electrical steel sheet after the slab and the final annealing step may be 2.0 to 4.0% by weight.
- the content of C in the slab is 0.1 to 0.4% by weight, since carbon (C) requires the process of exiting the central C to the surface in order to diffuse the Goss grains from the surface to the core during intermediate decarbonization and final annealing. Can be.
- the carbon amount in the grain-oriented electrical steel sheet after the final annealing step may be 0.0020% by weight or less (excluding 0% by weight).
- Antimony (Sb) has the effect of increasing the fraction of grains with ⁇ 110 ⁇ ⁇ 001> orientation in the intermediate decarbonization and final annealing recrystallization collection;
- Sb can obtain an effect of suppressing oxidation reaction during decarbonization annealing, the temperature can be further increased during decarbonization annealing, and precipitation at grain boundaries can suppress grain growth, thereby reducing the recrystallized grain size. Can be obtained. Therefore, the effect of domain refinement by recrystallization refinement
- Iron loss is inferior when the Sb content is less than 0.01% by weight, and when the Sb content is greater than 0.06% by weight, it is difficult to control grain size. Therefore, the Sb content in the grain-oriented electrical steel sheet after the slab and the final annealing step may be from 0.01 to 0.06 weight 3 ⁇ 4>.
- the slab reheating temperature may be between 1100 ° C. and 1350 ° C.
- the hot rolled tissue is not coarsened, and is reheated at a higher temperature than usual. Advantages can be obtained when rolling.
- the thickness of the hot rolled steel sheet may be 2mm to 5mm.
- the hot rolled steel sheet is annealed.
- the hot rolled sheet annealing may be carried out at a temperature of 850 ° C to 1000 ° C.
- the dew point silver may be 50 to 70 ° C at this time. Decarbonization is easy in the above-described range of silver and dew point temperature, so that Goss grains in the surface layer portion diffuse into the center portion.
- the cold rolled hot rolled steel sheet is cold rolled.
- Cold rolling can be made 50-70% of the reduction ratio.
- the cold rolling rate may be 55% to 65%.
- the cold rolled steel sheet is subjected to decarburization annealing.
- Decarburization annealing It can be carried out at an austenite single phase region or a region in which a ferrite and austenite composite phase is present at a dew point temperature of 40 ° C to 60 ° C. At this time, the temperature range may be 750 ° C to 95 CTC.
- the atmosphere may be a mixed gas atmosphere of hydrogen and nitrogen.
- the decarburization amount during decarburization annealing may be 0.0300wt% to 0.0600wt%.
- the grain size of the surface of the electrical steel sheet grows coarsely, but the grain inside the electrical steel sheet remains as a fine structure.
- the size of the surface ferrite grains may be 150 to 250.
- the manufacturing method of the grain-oriented electrical steel sheet according to an embodiment of the present invention is to diffuse the Goss grains in the surface layer portion caused by the decarburization annealing and cold rolling without using abnormal grain growth of the Goss grain orientation grains in the Goss orientation grains in the surface layer portion It is advantageous to form so as to distribute a large number. Therefore, cold rolling is performed two or more times with a reduction ratio of 50% to 70%. Decarburization annealing and cold rolling may be repeated two or more times.
- the final annealing may be performed continuously after cold rolling. That is, final annealing can be performed quickly. Specifically, the final annealing can be performed for 1 to 30 minutes.
- the reason why the final annealing can be performed continuously is that unlike the existing abnormal particle growth technology, it forms a Goss single crystal to induce normal particle growth.
- the final annealing step has a temperature of 90CTC to 1000 ° C and a dew point temperature of 55 ° C It can be carried out by dividing into a first step of performing annealing at 65 ° C and a second step of performing at a temperature of loocrc to 1200 ° c and at least 75% by volume.
- the grain-oriented electrical steel sheet produced in this way is obtained from the ⁇ 110 ⁇ ⁇ 001> orientation.
- the volume fraction of the grains having an orientation within 15 degrees may be 90% or more. Since the volume fraction of crystal grains having an orientation within 15 degrees from the ⁇ 110 ⁇ ⁇ 001> orientation is high, a grain-oriented electrical steel sheet excellent in magnetic properties can be obtained.
- the ratio of grains having a size of 30 to 1000 among the grains having an orientation within 15 degrees from the ⁇ 110 ⁇ ⁇ 001> orientation may be 80% or more.
- step (S20) is applied to the surface of the grain-oriented electrical steel sheet an insulating coating composition for a grain-oriented electrical steel sheet.
- the insulating coating composition for a grain-oriented electrical steel sheet may be applied in a range of 0.5 to 7 g / m 2 per one surface of the grain-oriented electrical steel sheet. If too much insulation coating composition for grain-oriented electrical steel sheet is applied, the drop ratio is lowered, and if the finally obtained grain-oriented electrical steel sheet is manufactured as a product such as a transformer, a problem may occur that the characteristics of the product are inferior. If too small an insulating coating composition for a grain-oriented electrical steel sheet is applied, there is a problem that the insulating properties expressed by the insulating coating are poor. Therefore, the insulating coating composition for oriented electrical steel sheets can be apply
- Step S30 heat-treats the grain-oriented electrical steel sheet coated with the insulating coating composition for grain-oriented electrical steel sheet.
- the heat treatment may be performed in a temperature range of 250 to 950 ° C. If the heat treatment temperature is too low, the drying of the insulating coating composition for a grain-oriented electrical steel sheet is made inadequately, and it may be difficult to secure the characteristics of the insulating coating. If the heat treatment silver is too high, speckle defects may occur on the insulating film. Therefore, the heat treatment temperature can be adjusted in the above-described range.
- the grain-oriented electrical steel sheet according to another embodiment of the present invention is a grain-oriented electrical steel sheet; And an insulating film formed on the surface of the grain-oriented electrical steel sheet. At this time, the insulating film, 10 to 50 parts by weight of the metal silicate or organic silicate, 20 to 70 parts by weight of inorganic nanoparticles and 0.1 to 20 parts by weight of cobalt hydroxide.
- Insulating coating composition for a grain-oriented electrical steel sheet is 10 to 50 parts by weight of metal phosphate, 5 to 30 inorganic nanoparticles having an average particle diameter of less than 10nm, 10 to 40 inorganic nanoparticles having a particle diameter of 10nm to 100nm. And 0.1 to 20 parts by weight of crust oxide.
- Metal phosphates are added to significantly improve the adhesion to ferrous iron and to impart high tensile stress.
- the metal phosphate may include at least one metal selected from Mg, Al, Ca, Fe, Mn, Sr, Zr, and Ba.
- the metal phosphate may be at least one of aluminum monophosphate, magnesium monophosphate, and calcium monophosphate.
- the metal phosphate may be a compound by chemical reaction of metal hydroxide and phosphoric acid (3 ⁇ 4P0 4 ), the metal of the metal hydroxide is selected from Mg, Al, Ca, Fe, Mn, Sr, Zr and Ba It may be more than one species.
- the metal phosphate is a compound in which a metal atom of a metal hydroxide reacts with phosphorus of phosphoric acid to form a single bond, a double bond, or a triple bond, and the amount of unbanung free phosphoric acid (H 3 P0 4 ) is 35% or less. It may be made.
- Metal phosphate is composed of a compound by a chemical reaction of metal hydroxide and phosphoric acid (H 3 P0 4 ), the weight ratio of the metal hydroxide to phosphoric acid may be represented by 1: 100 to 70: 100.
- metal hydroxide is included in excess of 70: 100, the chemical reaction will not be completed, which may lead to the formation of precipitates. If the metal hydroxide is included in the weight ratio of less than 1: 100, since the problem of corrosion resistance may occur, it is limited to the above-mentioned range.
- Metal phosphate may be included in 10 to 50 parts by weight. When too little metal phosphate is included, the adhesion of the coating may be lowered, which may cause a problem of deterioration of the film tension and adhesion. If too much metal phosphate is included, the insulation properties may be degraded. Therefore, the addition amount of a metal phosphate can be adjusted in the above-mentioned range.
- Inorganic nanoparticles form a ceramic layer with a low coefficient of thermal expansion during heat treatment of the insulating coating to impart a tensile force to the material.
- the inorganic nanoparticles are one selected from alumina (A1 2 0 3 ), silica (Si), titania (Ti3 ⁇ 4), zirconia (Zr0 2 ), yttrium oxide (Y 2 0 3 ), and magnesium oxide (MgO). It can be abnormal.
- the inorganic nanoparticles are used by mixing two or more kinds of inorganic nanoparticles having different particle diameters.
- solution properties may be improved by synergy of inorganic nanoparticles having different particle diameters. That is, the stability of the solution can be maintained for a long time by the inorganic nanoparticles having a relatively large particle size, and the surface layering property is improved and the insulating property is also excellent because the inorganic nanoparticles having a large particle size are filled with inorganic nanoparticles having a relatively small particle size.
- two types of inorganic nanoparticles may include inorganic nanoparticles having a particle diameter of 1 nm to less than 10 nm and inorganic nanoparticles having a particle diameter of 10 nm to 100 nm.
- inorganic nanoparticles having a particle diameter of 10 nm to 100 nm 5 to 30 parts by weight of inorganic nanoparticles having a particle diameter of 10 nm to 100 nm, and 10 to 40 parts by weight of inorganic nanoparticles having a particle diameter of 10 nm to 100 nm.
- the stability of the solution can be maintained for a long time, the surface layering property can be improved and the insulating property can also be excellent.
- inorganic nanoparticles having different particle diameters may be mixed, and inorganic nanoparticles having a particle diameter of 10 nm to 100 nm are 5-20 parts by weight of inorganic nanoparticles having a particle size of less than 10 nm to 30 nm, and particle sizes of 30 nm to 100 nm.
- Phosphorus inorganic nanoparticles may comprise 5 to 20 parts by weight. In the above-mentioned range, the stability of the solution can be maintained for a long time, the surface layering property It can be improved and the section properties can be excellent.
- Crum oxide serves to maintain stability by preventing gelation due to the mixing of metal phosphate and inorganic nanoparticles.
- Creme oxide may be included in 0.1 to 20 parts by weight. If the amount of addition of the crumb oxide is too small, a problem of insufficient stability maintenance may occur. If the amount of the crust oxide is added too much, it may adversely affect the film properties. Therefore, the addition amount of crust oxide can be adjusted in the above-mentioned range.
- the chromium oxide may be at least one selected from chromium trioxide, jade oxide, and chromium oxide.
- the insulation coating composition may further include a solvent. The solvent serves to improve the stability, spreadability and workability of the insulating coating composition.
- the solvent may be water, ethyl alcohol, isopropyl alcohol, or butanol.
- the solvent may be included in 10 to 25 parts by weight. In the aforementioned range, stability, spreadability and workability are improved.
- Insulating film forming method of a grain-oriented electrical steel sheet according to another embodiment of the present invention, the step of preparing an insulating film composition for a grain-oriented electrical steel sheet and a grain-oriented electrical steel sheet (S10); Applying an insulating coating composition for a grain-oriented electrical steel sheet to the surface of the grain-oriented electrical steel sheet (S20); Heat-treating the grain-oriented electrical steel sheet coated with the insulating coating composition for grain-oriented electrical steel sheet (S30); And obtaining a grain-oriented electrical steel sheet having an insulating coating formed on its surface (S40).
- the insulating coating composition for a grain-oriented electrical steel sheet 10 to 50 parts by weight of metal phosphate, 5 to 30 parts by weight of inorganic nanoparticles having a particle diameter of less than lnm to lOnm, 10 to 40 parts by weight of inorganic nanoparticles having a particle size of lOnm to 100nra and crum oxide 0.1 to 20 parts by weight.
- each step of the insulating film forming method of the grain-oriented electrical steel sheet will be described in more detail.
- step (S10) to prepare an insulating coating composition for a grain-oriented electrical steel sheet and a grain-oriented electrical steel sheet, respectively.
- Description of the insulating coating composition for a grain-oriented electrical steel sheet as described above will not be repeated description.
- the grain-oriented electrical steel sheet includes, by weight, Si: 2.0 to 4.0%, C: 0.002% or less (excluding 0%), and Sb 0.01 to 0.06%, and the balance may be made of Fe and other unavoidable impurities.
- the method for producing a grain-oriented electrical steel sheet includes, by weight, Si: 2.0% to 4.0%, C: 0.01% to 0.4%, and Sb: 0.01% to 0.06%, and the balance is Fe and other unavoidable impurities.
- Si 2.0% to 4.0%
- C 0.01% to 0.4%
- Sb 0.01% to 0.06%
- the reason for limiting the composition is as follows.
- Silicon (Si) improves iron loss by lowering the magnetic anisotropy of electrical steel sheets and increasing the specific resistance. Iron loss is inferior when the Si content is less than 2.0% by weight, and brittleness is increased when the amount is increased by 4.0% by weight. Therefore, the content of Si in the grain-oriented electrical steel sheet after the slab and the final annealing step may be 2.0 to 4.0% by weight.
- the content of C in the slab may be 0/1 to 0.4% by weight because carbon (C) requires the process of exiting the central C from the surface layer in order for the Goss grains in the surface layer to diffuse into the core during intermediate decarbonization and final annealing. have.
- the "carbon content in the final annealing step after the grain-oriented electrical steel sheet may be (except for 0% by weight) 0.0020 wt% or less.
- Antimony (Sb) has the effect of increasing the fraction of grains with ⁇ 110 ⁇ ⁇ 001> orientation in the recrystallized texture during intermediate decarbonization and final annealing.
- Sb can obtain the effect of suppressing the reaction of oxidation during decarbonization annealing, it is possible to raise the temperature at the time of decarbonization annealing and precipitate at the grain boundary Since growth can be suppressed, the advantage that the recrystallization grain size can be made small can be obtained. Therefore, the effect of domain refinement by recrystallization refinement
- Iron loss is inferior when the Sb content is less than 0.01% by weight, and when the Sb content is greater than 0.06% by weight, it is difficult to control grain size. Therefore, the Sb content in the grain-oriented electrical steel sheet after the slab and the final annealing step may be 0.01 to 0.06 weight 3 ⁇ 4>.
- the slab reheating temperature may be between 1100 ° C. and 1350 ° C.
- the thickness of the hot rolled steel sheet may be 2mm to 5mra.
- the hot rolled steel sheet is annealed.
- the hot rolled sheet annealing can be carried out in the silver degree of 850 ° C to 100CTC.
- the dew point temperature may be 50 to 70 ° C. In the above-described temperature and dew point silver, decarbonization is easy, so that the Goss grains in the surface layer portion diffuse into the center portion.
- the reduction ratio of 50-7 It can be set as the reduction ratio of 50-7.
- the cold rolling rate may be 55% to 65%.
- the cold rolled steel sheet is subjected to decarburization annealing.
- Decarburization annealing may be performed at a dew point of 40 ° C. to 60 ° C. in the austenite single phase region or in the region in which the ferrite and austenite composite phases are present.
- the temperature range may be 750 ° C to 95 C C.
- the atmosphere may be a mixed gas atmosphere of hydrogen and nitrogen.
- the decarburization amount during decarburization annealing may be 0.0300wt% to 0.0600wt%.
- the grain size of the surface of the electrical steel sheet It grows coarsely, but the grain inside the steel sheet remains as a microstructure.
- the size of the surface ferrite grains may be 150 to 250.
- the present invention it is possible to manufacture a grain-oriented electrical steel sheet without using a grain growth inhibitor, and since the Goss is grown through the decarburization process, it is possible to omit the annealing forming a separate inhibitor. Can be omitted.
- the manufacturing method of the grain-oriented electrical steel sheet according to an embodiment of the present invention is to diffuse the Goss grains in the surface layer portion caused by the decarburization annealing and cold rolling without using abnormal grain growth of the Goss grain orientation grains in the Goss orientation grains in the surface layer portion It is advantageous to form so as to distribute a large number. Therefore, cold rolling is performed two or more times with a reduction ratio of 50% to 70%. Decarburization annealing and cold rolling can be repeated two or more times.
- the final annealing may be performed continuously after cold rolling. That is, final annealing can be performed quickly. Specifically, the final annealing can be performed for 1 to 30 minutes.
- the reason why the final annealing can be performed continuously is that unlike the existing abnormal particle growth technology, it forms a Goss single crystal to induce normal particle growth.
- the final annealing step is the first step of annealing at a temperature of 900 ° C to 1000 ° C and a dew point temperature of 55 ° C to 65 ° C, and the agent to be carried out in an atmosphere of lOOCrC to 1200 ° C silver and 3 ⁇ 4 75 volume% or more We can divide into two phases and can carry out.
- the grain-oriented electrical steel sheet manufactured in this way was obtained from the ⁇ 110 ⁇ ⁇ 001> orientation.
- the volume fraction of the grains having an orientation within 15 degrees may be 90% or more. Since the volume fraction of crystal grains having an orientation within 15 degrees from the ⁇ 110 ⁇ ⁇ 001> orientation is high, a grain-oriented electrical steel sheet excellent in magnetic properties can be obtained.
- the ratio of grains having a size of 30 to 1000 among grains having an orientation within 15 degrees from the ⁇ 110 ⁇ ⁇ 001> orientation may be 80% or more.
- step (S20) is applied to the surface of the grain-oriented electrical steel sheet an insulating coating composition for a grain-oriented electrical steel sheet.
- the insulating coating composition for a grain-oriented electrical steel sheet may be applied in a range of 0.5 to 7 g / m 2 per one surface of the grain-oriented electrical steel sheet.
- the insulating coating composition for oriented electrical steel sheets can be apply
- Step S30 heat-treats the grain-oriented electrical steel sheet coated with the insulating coating composition for grain-oriented electrical steel sheet.
- the heat treatment may be performed in a temperature range of 250 to 950 ° C. If the heat treatment temperature is too low, the drying of the insulating coating composition for a grain-oriented electrical steel sheet is made insufficient, a problem that is difficult to secure the characteristics of the insulating coating may occur. If the heat treatment temperature is too high, speckle defects may occur on the insulating film. Therefore, the heat treatment silver can be adjusted in the above-described range.
- the grain-oriented electrical steel sheet according to another embodiment of the present invention is a grain-oriented electrical steel sheet; And an insulating film formed on the surface of the grain-oriented electrical steel sheet.
- the insulating film 10 to 50 parts by weight of metal phosphate, 5 to 30 parts by weight of inorganic nanoparticles having a particle diameter of less than lnm to ⁇ , inorganic having a particle size of 10nm to 100nm 10 to 40 parts by weight of nanoparticles and 0.1 to 20 parts by weight of crust oxide.
- Description of the insulating coating composition for a grain-oriented electrical steel sheet and the grain-oriented electrical steel sheet as described above will not be repeated description.
- preferred examples and comparative examples of the present invention are described. However, the following examples are only preferred examples of the present invention and the present invention is not limited to the following examples.
- Example 1 Example 1
- the cold rolled plate was further subjected to decarburization annealing for 100 seconds in a humidified atmosphere of hydrogen and nitrogen (dew point temperature 60 ° C) at a temperature of 90 CTC. Thereafter, secondary cold rolling was performed at a reduction ratio of 60%, and secondary decarburization annealing was performed for 45 seconds under the same conditions.
- hydrogen at 950 ° C, wet of nitrogen (dew point temperature 60 ° C) the first final annealing for 45 seconds in a mixed gas atmosphere, and then hydrogen at 1080 ° C Second final annealing was performed for 2 minutes in the atmosphere. At this time, the temperature increase rate up to 700 ° C during the final annealing was carried out at 150 ° C / Sec.
- the thickness of the prepared grain-oriented electrical steel sheet was 0.27 ⁇ , the specimen was prepared by 300x60 ⁇ .
- the volume fraction of grains having an orientation within 15 degrees from the ⁇ 110 ⁇ ⁇ 001> orientation was 94%, and the orientation within 15 degrees from the ⁇ 110 ⁇ ⁇ 001> orientation.
- the proportion of the crystal grains having a size of 30 ⁇ m or more and 100 ⁇ m or less was 83%.
- the insulating coating composition was prepared by mixing 35 parts by weight of alumina nanoparticles with an average particle diameter of 7 nm, 40 parts by weight of sodium silicate, 5 parts by weight of cobalt hydroxide, and 20 parts by weight of water.
- the insulating film composition was applied to the surface of the finished grain-oriented electrical steel sheet in an amount of 4.2 g / m 2 , and heat-treated at 850 ° C. for 30 seconds to obtain a grain-oriented electrical steel sheet having an insulating film.
- the thickness of the insulating film was 2.
- the magnetic flux density, iron loss, insulating film tension, and corrosion resistance of the grain-oriented electrical steel sheet having the insulating film prepared in Example 1 were evaluated by the following method and summarized in Table 1 below.
- Example 2 In the same manner as in Example 1 to prepare a grain-oriented electrical steel sheet with an insulating coating, but used instead of sodium silicate silicate silicate.
- the magnetic flux density, iron loss, insulating film tension and corrosion resistance of the grain-oriented electrical steel sheet having the insulating film prepared in Example 2 were evaluated by the following method, and summarized in Table 1 below.
- Example 2 In the same manner as in Example 1, a grain-oriented electrical steel sheet having an insulating coating was manufactured, but calcium silicate was used instead of sodium silicate.
- Magnetic flux density, iron loss, insulating film tension, and corrosion resistance of the grain-oriented electrical steel sheet having an insulating coating prepared in Example 3 were evaluated by the following method, and summarized in Table 1 below.
- the magnetic flux density, iron loss, insulating film tension and corrosion resistance of the grain-oriented electrical steel sheet having the insulating film prepared in Example 4 were evaluated by the following method and summarized in Table 1 below.
- Test example 1 Measuring method of iron loss
- Test example 2 Measurement method of magnetic flux density
- the magnetic flux density value flowing through the electrical steel sheet was measured when an electric current of 800 A / m was placed in the winding wound around the electrical steel sheet.
- the tensile tension by the insulating film formed on the surface was bent in one direction, and the degree of warpage was measured to evaluate the film tension by the insulating film.
- the directional electrical steel sheet formed with an insulating coating according to an embodiment of the present invention is excellent in electrical properties, it can be confirmed that the excellent insulation, film tension and corrosion resistance.
- silica nanoparticles having an average particle diameter of 5nm.
- silica nanoparticles having an average particle diameter of 12nm.
- silica nanoparticles having an average particle diameter of 50nm.
- Example 2 In the same manner as in Example 1, an oriented electrical steel 1 ⁇ 2: having an insulating coating was prepared, but instead of the alumina nanoparticles, silica nanoparticles having an average particle diameter of 5 nm 15 20 parts by weight of silica nanoparticles having a weight part and an average particle diameter of 15 nm were used.
- the magnetic flux density, iron loss, insulating film tension and corrosion resistance of the grain-oriented electrical steel sheet formed with the insulating film obtained in Example 9 were summarized in Table 2 below. It was.
- Example 2 In the same manner as in Example 1 to prepare a grain-oriented electrical steel sheet with an insulating coating, in place of the alumina nanoparticles 10 parts by weight of silica nanoparticles having an average particle diameter of 5nm, 10 parts by weight of silica nanoparticles having an average particle diameter of 25nm and 40nm silica nanoparticles 15 parts by weight was used
- Example 9 As can be seen from Table 2, it was observed that Example 9 and Example 10 using a mixture of two or more kinds of silica nanoparticles having different particle diameters have better coating tension and insulation, and also improved corrosion resistance.
- Example 11 As can be seen from Table 2, it was observed that Example 9 and Example 10 using a mixture of two or more kinds of silica nanoparticles having different particle diameters have better coating tension and insulation, and also improved corrosion resistance.
- a slab containing 2.0% of Si, 0.20% of C, and 0.05% of Sb, and a remainder containing Fe and unavoidable impurities were heated at a temperature of 1150 ° C for 220 minutes, followed by hot rolling to a thickness of 3 ⁇ .
- Hot-rolled sheet annealing was performed for 150 seconds at annealing temperature of 900 ° C. and dew point of 60 ° C., followed by pickling and pickling.
- Cold rolling was performed at a rolling reduction of 60%.
- the cold rolled plate was further subjected to decarburization annealing for 100 seconds in a humidified atmosphere of hydrogen and nitrogen (dew point temperature 60 ° C) at a temperature of 90 CTC. Thereafter, secondary cold rolling was performed at a reduction ratio of 60%, and secondary decarburization annealing was performed for 45 seconds under the same conditions. Again the tertiary cold rolling to a reduction ratio of 603 ⁇ 4> and the hydrogen in the 950 ° C The silver, wetting of the nitrogen of hydrogen (dew point silver is 60 ° C) and then subjected to 45 seconds primary finish-annealing at heunhap gas atmosphere to 1080 ° C Second final annealing was performed for 2 minutes in the atmosphere. At this time, the temperature rising rate of the final annealing up to 700 ° C. was carried out at 150 ° C / Sec. The thickness of the prepared grain-oriented electrical steel sheet was 0.27 ⁇ , the specimen was prepared with 300x60mm.
- the volume fraction of grains having an orientation within 15 degrees from the ⁇ 110 ⁇ ⁇ 001> orientation was 94%, and the orientation within 15 degrees from the ⁇ 110 ⁇ ⁇ 001> orientation. 83% of the grains had 3 ⁇ 4 groups of 30 ⁇ m or more and 100 ⁇ m or less.
- the insulating coating composition was prepared by mixing 15 parts by weight of silica nanoparticles having an average particle diameter of 5 nm, 20 parts by weight of silica nanoparticles having an average particle diameter of 15 nm, 40 parts by weight of aluminum phosphate, 5 parts by weight of trioxide, and 20 parts by weight of water.
- the insulating film composition was applied to the surface of the finished grain-oriented electrical steel sheet in an amount of 4.2 g / m 2 and heat-treated at 850 ° C. for 30 seconds to obtain a grain-oriented electrical steel sheet having an insulating film.
- the thickness of the insulating film was 2.
- the magnetic flux density, iron loss, insulating film tension, and corrosion resistance of the grain-oriented electrical steel sheet having the insulating film prepared in Example 11 were summarized in Table 3 below.
- Example 12 In the same manner as in Example 11, a grain-oriented electrical steel sheet having an insulating coating was prepared, wherein the silica nanoparticles were 10 parts by weight of the silica nanoparticles having an average particle diameter of 5 nm, 10 parts by weight of the silica nanoparticles having an average particle diameter of 25 nm and silica nanoparticles having an average particle diameter of 40 nm. 15 parts by weight was used.
- the magnetic flux density, iron loss, insulating film tension and corrosion resistance of the grain-oriented electrical steel sheet having the insulating film prepared in Example 12 were evaluated by the above-described method, and summarized in Table 3 below.
- silica nanoparticles of silica nanoparticles having an average particle diameter of 5nm-5 parts by weight, 10 parts by weight of silica nanoparticles having an average particle diameter of 25nm and silica nanoparticles of an average particle diameter of 25nm 10 parts by weight of particles were used.
- the magnetic flux density, iron loss, insulating film tension, and corrosion resistance of the grain-oriented electrical steel sheet having the insulating film prepared in Example 13 were evaluated by the above-described method, and summarized in Table 3 below.
- Example 11 In the same manner as in Example 11, a grain-oriented electrical steel sheet having an insulating coating was manufactured, and 35 parts by weight of silica nanoparticles having an average particle diameter of 5 nm were used for the silica nanoparticles.
- Example 11 In the same manner as in Example 11, a grain-oriented electrical steel sheet having an insulating coating was prepared, but 35 parts by weight of silica nanoparticles having an average particle diameter of 12 nm were used.
- Comparative Example 3 In the same manner as in Example 11, a grain-oriented electrical steel sheet having an insulating coating was manufactured, and 35 parts by weight of silica nanoparticles having an average particle diameter of 50 nm were used.
- the insulating film formed according to an embodiment of the present invention As can be seen in Table 3, the insulating film formed according to an embodiment of the present invention. By using inorganic nanoparticles having two or more kinds of particle size, the grain-oriented electrical steel sheet was observed to have better film tension and insulation property and improved corrosion resistance.
- Example 11 In the same manner as in Example 11, a grain-oriented electrical steel sheet having an insulating coating was formed Magnesium phosphate was used instead of aluminum phosphate.
- Example 11 In the same manner as in Example 11, a grain-oriented electrical steel sheet having an insulating coating was manufactured, but calcium phosphate was used instead of aluminum phosphate.
- Example 11 In the same manner as in Example 11, a grain-oriented electrical steel sheet having an insulating coating was manufactured, but manganese phosphate was used instead of aluminum phosphate.
- the magnetic flux density, iron loss, insulating film tension, and corrosion resistance of the grain-oriented electrical steel sheet having the insulating film prepared in Example 16 were evaluated by the above-described method, and summarized in Table 4 below.
- Example 11 In the same manner as in Example 11, a grain-oriented electrical steel sheet having an insulating coating was manufactured, but strontium phosphate was used instead of aluminum phosphate.
- the magnetic flux density, iron loss, insulating film tension, and corrosion resistance of the grain-oriented electrical steel sheet having the insulating film prepared in Example 17 were evaluated by the above-described method, and summarized in Table 4 below.
- the grain-oriented electrical steel sheet formed with an insulating coating according to an embodiment of the present invention can be confirmed that the excellent electrical properties, excellent insulation, film tension and corrosion resistance.
- the present invention is not limited to the above embodiments, but may be manufactured in various forms, and a person of ordinary skill in the art to which the present invention pertains does not change the technical spirit or essential features of the present invention. It can be understood that it could be implemented. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.
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CN201680075465.0A CN108475553B (zh) | 2015-12-22 | 2016-12-22 | 取向电工钢板用绝缘皮膜组合物、取向电工钢板的绝缘皮膜形成方法及取向电工钢板 |
EP16879374.3A EP3396681B1 (en) | 2015-12-22 | 2016-12-22 | Insulation film composition for grain-oriented electrical steel sheet, method for forming insulation film for grain-oriented electrical steel sheet using same, and grain-oriented electrical steel sheet |
JP2018533048A JP6808734B2 (ja) | 2015-12-22 | 2016-12-22 | 方向性電磁鋼板用絶縁被膜組成物、これを利用した方向性電磁鋼板の絶縁被膜形成方法、及び方向性電磁鋼板 |
US17/721,936 US11848122B2 (en) | 2015-12-22 | 2022-04-15 | Insulation film composition for grain-oriented electrical steel sheet, method for forming insulation film for grain-oriented electrical steel sheet using same, and grain-oriented electrical steel sheet |
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