WO2022139335A1 - 무방향성 전기강판 및 그 제조방법 - Google Patents
무방향성 전기강판 및 그 제조방법 Download PDFInfo
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- WO2022139335A1 WO2022139335A1 PCT/KR2021/019219 KR2021019219W WO2022139335A1 WO 2022139335 A1 WO2022139335 A1 WO 2022139335A1 KR 2021019219 W KR2021019219 W KR 2021019219W WO 2022139335 A1 WO2022139335 A1 WO 2022139335A1
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- steel sheet
- oriented electrical
- electrical steel
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- 229910000565 Non-oriented electrical steel Inorganic materials 0.000 title claims abstract description 45
- 238000004519 manufacturing process Methods 0.000 title claims description 34
- 238000000034 method Methods 0.000 title claims description 15
- 239000012535 impurity Substances 0.000 claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims description 37
- 229910052758 niobium Inorganic materials 0.000 claims description 37
- 239000010959 steel Substances 0.000 claims description 37
- 229910052719 titanium Inorganic materials 0.000 claims description 35
- 238000000137 annealing Methods 0.000 claims description 30
- 230000005587 bubbling Effects 0.000 claims description 26
- 229910052799 carbon Inorganic materials 0.000 claims description 21
- 229910052757 nitrogen Inorganic materials 0.000 claims description 21
- 230000035699 permeability Effects 0.000 claims description 16
- 229910052750 molybdenum Inorganic materials 0.000 claims description 15
- 229910052748 manganese Inorganic materials 0.000 claims description 10
- 229910052782 aluminium Inorganic materials 0.000 claims description 9
- 238000005097 cold rolling Methods 0.000 claims description 9
- 229910052787 antimony Inorganic materials 0.000 claims description 8
- 150000004767 nitrides Chemical class 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 8
- 150000001247 metal acetylides Chemical class 0.000 claims description 7
- 229910052710 silicon Inorganic materials 0.000 claims description 7
- 238000005336 cracking Methods 0.000 claims description 6
- 238000005098 hot rolling Methods 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 4
- 239000011261 inert gas Substances 0.000 claims description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims description 4
- 229910052717 sulfur Inorganic materials 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 50
- 239000010955 niobium Substances 0.000 description 47
- 239000010936 titanium Substances 0.000 description 43
- 229910052742 iron Inorganic materials 0.000 description 20
- 230000005389 magnetism Effects 0.000 description 18
- 239000011572 manganese Substances 0.000 description 14
- 230000015572 biosynthetic process Effects 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 10
- 230000004907 flux Effects 0.000 description 9
- 229910045601 alloy Inorganic materials 0.000 description 8
- 239000000956 alloy Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 239000010949 copper Substances 0.000 description 7
- 238000009628 steelmaking Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 229910001021 Ferroalloy Inorganic materials 0.000 description 5
- 238000007792 addition Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000002436 steel type Substances 0.000 description 5
- 229910052718 tin Inorganic materials 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 230000005381 magnetic domain Effects 0.000 description 4
- 239000002244 precipitate Substances 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 229910000976 Electrical steel Inorganic materials 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 238000010301 surface-oxidation reaction Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910001224 Grain-oriented electrical steel Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910001182 Mo alloy Inorganic materials 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 229910017305 Mo—Si Inorganic materials 0.000 description 1
- 229910001257 Nb alloy Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- FHKPLLOSJHHKNU-INIZCTEOSA-N [(3S)-3-[8-(1-ethyl-5-methylpyrazol-4-yl)-9-methylpurin-6-yl]oxypyrrolidin-1-yl]-(oxan-4-yl)methanone Chemical compound C(C)N1N=CC(=C1C)C=1N(C2=NC=NC(=C2N=1)O[C@@H]1CN(CC1)C(=O)C1CCOCC1)C FHKPLLOSJHHKNU-INIZCTEOSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
- C21D8/1222—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
-
- 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
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
- C21D8/1233—Cold rolling
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
- H01F1/14766—Fe-Si based alloys
- H01F1/14791—Fe-Si-Al based alloys, e.g. Sendust
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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
Definitions
- One embodiment of the present invention relates to a non-oriented electrical steel sheet and a method for manufacturing the same. Specifically, one embodiment of the present invention relates to a non-oriented electrical steel sheet that appropriately adds Mo, Ti, and Nb, and suppresses the formation of fine carbonitrides through bubbling during the manufacturing process of molten steel, and a manufacturing method thereof. As a result, the present invention relates to a non-oriented electrical steel sheet and a method for manufacturing the same, which improve the magnetic properties by improving the cleanliness of the steel to facilitate the movement of magnetic domain walls.
- An embodiment of the present invention provides a non-oriented electrical steel sheet and a method for manufacturing the same. More specifically, in one embodiment of the present invention, Mo, Ti, and Nb are appropriately added, and a non-oriented electrical steel sheet for suppressing the formation of fine carbonitrides through bubbling during the manufacturing process of molten steel and a manufacturing method thereof are provided.
- Non-oriented electrical steel sheet according to an embodiment of the present invention by weight%, Si: 2.0 to 3.8%, Al: 0.1 to 2.5%, Mn: 0.1 to 2.5%, Mo: 0.01 to 0.08%, Ti: 0.0010 to 0.0050 %, Nb: 0.0010 to 0.0050%, C: 0.0020 to 0.0060%, and N: 0.0010 to 0.0050%, including the remainder Fe and unavoidable impurities, and satisfies Formula 1 below.
- the non-oriented electrical steel sheet according to an embodiment of the present invention may have a density of at least one of carbides, nitrides and carbonitrides having a particle diameter of 0.1 ⁇ m or less, 100 pieces/mm 2 or less.
- the total amount of Ti, Nb, C and N may be 0.003 to 0.015 wt%.
- the non-oriented electrical steel sheet according to an embodiment of the present invention may further include at least one of Sn: 0.015 to 0.1 wt%, Sb: 0.015 to 0.1 wt%, and P: 0.005 to 0.05 wt%.
- the non-oriented electrical steel sheet according to an embodiment of the present invention is Cu: 0.01% by weight or less, S: 0.005% by weight or less, B: 0.002% by weight or less, Mg: 0.005% by weight or less, and Zr: 0.005% by weight or less. More may be included.
- the non-oriented electrical steel sheet according to an embodiment of the present invention may have a specific resistance of 50 ⁇ cm or more.
- the non-oriented electrical steel sheet according to an embodiment of the present invention may have an average grain size of 50 to 100 ⁇ m.
- the non-oriented electrical steel sheet according to an embodiment of the present invention may have a magnetic permeability of 5000 or more at 30A/m.
- the non-oriented electrical steel sheet manufacturing method is, by weight, Si: 2.0 to 3.8%, Al: 0.1 to 2.5%, Mn: 0.1 to 2.5%, Mo: 0.01 to 0.08%, Ti: 0.0010 to 0.0050%, Nb: 0.0010 to 0.0050%, C: 0.0020 to 0.0060%, and N: 0.0010 to 0.0050%, including the remainder Fe and unavoidable impurities, preparing molten steel satisfying the following formula 1; bubbling the molten steel for 5 to 10 minutes; manufacturing a slab by continuously casting molten steel; preparing a hot-rolled sheet by hot-rolling the slab; Cold-rolling the hot-rolled sheet to manufacture a cold-rolled sheet and final annealing of the cold-rolled sheet.
- Inert gas can be used for bubbling at a flow rate of 5 Nm 3 or higher.
- the grain growth rate calculated by the following formula 2 may be 10 to 15.
- Grain growth property Cracking temperature in the final annealing stage (°C) ⁇ Cracking time in the final annealing stage (min) / Average grain size ( ⁇ m)
- Mo is added at a certain ratio of Ti and Nb to suppress the formation of fine carbonitrides to improve the cleanliness in the steel, thereby facilitating movement of the magnetic domain walls, thereby improving magnetization properties. Due to this, the initial permeability is improved, so it is effective for iron loss in the high frequency region. Therefore, it contributes to manufacturing eco-friendly automobile motors, high-efficiency home appliance motors, and super premium electric motors by providing the technology to manufacture non-oriented electrical steel sheets suitable for high-speed rotation.
- first, second and third etc. are used to describe, but are not limited to, various parts, components, regions, layers and/or sections. These terms are used only to distinguish one part, component, region, layer or section from another part, component, region, layer or section. Accordingly, a first part, component, region, layer or section described below may be referred to as a second part, component, region, layer or section without departing from the scope of the present invention.
- % means weight %, and 1 ppm is 0.0001 weight %.
- the meaning of further including the additional element means that the remaining iron (Fe) is included by replacing the additional amount of the additional element.
- Non-oriented electrical steel sheet according to an embodiment of the present invention by weight%, Si: 2.0 to 3.8%, Al: 0.1 to 2.5%, Mn: 0.1 to 2.5%, Mo: 0.01 to 0.08%, Ti: 0.0010 to 0.0050 %, Nb: 0.0010 to 0.0050%, C: 0.0020 to 0.0060% and N: 0.0010 to 0.0050%, and the remainder Fe and unavoidable impurities.
- Si serves to increase the resistivity of the material and lower the iron loss. When too little Si is added, the effect of improving iron loss may be insufficient. If Si is added too much, the hardness of the material may increase, and thus productivity and punchability may be deteriorated. Accordingly, Si may be included in an amount of 2.0 to 3.8 wt%. More specifically, it may include 2.3 to 3.7 wt%. More specifically, it may include 3.5 to 3.3 wt%.
- Aluminum (Al) serves to increase the resistivity of the material and lower the iron loss. If too little Al is added, it may be difficult to obtain a magnetic improvement effect because fine nitride is not formed or the surface oxide layer is not densely formed. When Al is added too much, nitride is formed excessively, which deteriorates magnetism, and causes problems in all processes such as steelmaking and continuous casting, which can greatly reduce productivity. Accordingly, it may contain 0.1 to 2.5% by weight of Al. More specifically, it may contain 0.2 to 2.0 wt%. More specifically, it may contain 0.5 to 1.5 wt%.
- Mn Manganese
- MnS Manganese
- Mn may be included in an amount of 0.1 to 2.5% by weight. More specifically, it may include 0.15 to 2.0 wt%. More specifically, it may contain 0.2 to 1.5 wt%.
- Molybdenum (Mo) is completely dissolved by reacting with Nb and Ti to suppress the formation of (Nb, Ti)C,N and to coarsen carbonitrides to reduce the distribution density. If too little Mo is added, complete solutionization may not be achieved, and the ability to inhibit the formation of carbide nitrides may be reduced. If too much Mo is added, a Si compound may be formed in the steel sheet to suppress grain growth of the entire steel sheet, resulting in inferior magnetism. Accordingly, it may contain 0.01 to 0.08 wt% of Mo. More specifically, it may contain 0.02 to 0.07 wt%. More specifically, it may include 0.03 to 0.05 wt%.
- Niobium (Nb) and titanium (Ti) combine with C and N to form fine carbides and nitrides, so each should be limited to 0.0050% or less.
- Mo when Mo is added, it is combined with it and completely dissolved, or exists in the form of coarse carbonitride, thereby reducing the role of inhibiting magnetic domain wall movement.
- Mo when Mo is added, it is necessary to add 0.0010% by weight or more, respectively, in order to suppress the formation of the Si compound.
- Nb and Ti may each contain 0.0010 to 0.0050 wt%. More specifically, it may contain 0.0015 to 0.0040 wt%, respectively. More specifically, it may contain 0.0020 to 0.0040 wt%, respectively.
- Carbon (C) causes magnetic aging and combines with Ti, Nb, etc. to form carbides, thereby deteriorating magnetic properties.
- the formation of carbides was maximally suppressed through bubbling during the steelmaking process together with the addition of Mo, and even if it contains 0.0020 wt% or more, the magnetic properties are not significantly affected.
- the additional cost of the decarburization process is too large, which may cause a cost increase problem.
- C may be included in an amount of 0.0020 to 0.0060% by weight. More specifically, it may include 0.0025 to 0.0050 wt%. More specifically, it may include 0.0025 to 0.0040 wt%.
- N Nitrogen (N) not only forms fine AlN precipitates inside the base material, but also forms fine nitrides by combining with Ti, Nb, etc. to suppress grain growth and deteriorate iron loss.
- the formation of carbides is maximally suppressed through bubbling during the steelmaking process with the addition of Mo, and even if it contains 0.0010 wt% or more, the magnetic properties are not significantly affected.
- management costs such as the purity of molten steel alloy and the purity of molten iron are too high, which may cause a cost increase problem.
- N may be included in an amount of 0.0010 to 0.0050% by weight. More specifically, it may include 0.0015 to 0.0045% by weight. More specifically, it may include 0.0015 to 0.0040 wt%.
- Ti+Nb+C+N 0.0030 to 0.0150 wt%
- the upper limit of the total amount can be limited to 0.015 wt%.
- the lower limit may be limited to 0.003 wt% in order to inhibit the formation of intermetallic compounds by reacting Mo with Si. More specifically, the total amount of Ti, Nb, C and N may be 0.0050 to 0.0150 wt%.
- the non-oriented electrical steel sheet according to an embodiment of the present invention satisfies Equation 1 below.
- Equation 1 When Equation 1 is satisfied, the formation of fine carbonitrides can be minimized. That is, within the range of 0.020 to 0.050, the formation of fine carbonitrides is suppressed and the distribution density of the carbonitride is minimized, so that it can be managed in this range. More specifically, the value of Equation 1 may be 0.030 to 0.060.
- the non-oriented electrical steel sheet according to an embodiment of the present invention may further include at least one of Sn: 0.015 to 0.1 wt%, Sb: 0.015 to 0.1 wt%, and P: 0.005 to 0.05 wt%.
- Tin (Sn) and antimony (Sb) segregate on the surface and grain boundaries of the steel sheet to suppress surface oxidation during annealing, prevent diffusion of elements through grain boundaries, and interfere with recrystallization of ⁇ 111 ⁇ //ND orientations to form a texture plays a role in improving
- Sn and Sb may further include 0.015 to 0.100 wt%, respectively. More specifically, each of 0.020 to 0.075% by weight may be further included.
- Phosphorus (P) segregates on the surface and grain boundaries of the steel sheet to suppress surface oxidation during annealing, interferes with the diffusion of elements through grain boundaries, and improves texture by preventing recrystallization of ⁇ 111 ⁇ //ND orientation do. If too little P is added, the effect may not be sufficient. If too much P is added, the hot working properties may be deteriorated, and productivity may be lowered compared to the improvement of the magnetic field. Accordingly, it may further include 0.005 to 0.050 wt% of P. More specifically, it may further include 0.007 to 0.045 wt% of P.
- the non-oriented electrical steel sheet according to an embodiment of the present invention is Cu: 0.01% by weight or less, S: 0.005% by weight or less, B: 0.002% by weight or less, Mg: 0.005% by weight or less, and Zr: 0.005% by weight or less. More may be included.
- Copper (Cu) is an element capable of forming sulfides at high temperatures, and when added in a large amount, it is an element that causes defects in the surface during the manufacture of slabs. Accordingly, when Cu is further included, it may be included in an amount of 0.01 wt% or less. More specifically, it may include 0.001 to 0.01 wt%.
- S Sulfur
- MnS, CuS, and (Mn, Cu)S Sulfur (S) forms fine precipitates MnS, CuS, and (Mn, Cu)S to deteriorate magnetic properties and deteriorate hot workability, so it is better to keep it low. Therefore, when it further includes S, it may be included in an amount of 0.005% by weight or less. More specifically, it may include 0.0001 to 0.005 wt%. More specifically, it may include 0.0005 to 0.0035 wt%.
- Mg, and Zr may be further included in each of the above-described ranges as elements that adversely affect magnetism.
- the balance contains Fe and unavoidable impurities.
- the unavoidable impurities are impurities mixed in during the steel making step and the manufacturing process of the grain-oriented electrical steel sheet, which are widely known in the relevant field, and thus a detailed description thereof will be omitted.
- the addition of elements other than the alloy components described above is not excluded, and may be included in various ways within the scope of not impairing the technical spirit of the present invention. When additional elements are included, they are included by replacing the remainder of Fe.
- the non-oriented electrical steel sheet according to an embodiment of the present invention may have a density of at least one of carbides, nitrides and carbonitrides having a particle diameter of 0.1 ⁇ m or less, 100 pieces/mm 2 or less.
- the carbonitride particle size may be 0.02 ⁇ m. Carbonitrides smaller than the above-mentioned particle diameter may not have a substantial effect on magnetism.
- the particle size may mean a particle size of a circle assuming an imaginary circle having the same area as the area of the carbonitride when the steel sheet is observed.
- the measurement surface of the carbonitride may be a cross-section (TD surface) in the vertical direction of rolling. Carbonitrides can be observed using SEM.
- the density of carbonitrides may be 100/mm 2 . More specifically, it may be 50 to 100 pieces/mm 2 .
- the non-oriented electrical steel sheet according to an embodiment of the present invention may have a specific resistance of 50 ⁇ cm or more. More specifically, it may be 53 ⁇ cm or more. More specifically, it may be 58 ⁇ cm or more.
- the upper limit is not particularly limited, but may be 100 ⁇ cm or less.
- the non-oriented electrical steel sheet according to an embodiment of the present invention has improved magnetic permeability and is suitable for high-speed rotation. As a result, when applied to the motor of an eco-friendly vehicle, it can contribute to improving the mileage.
- the non-oriented electrical steel sheet according to an embodiment of the present invention may have a magnetic permeability of 5000 or more at 30A/m.
- the non-oriented electrical steel sheet according to an embodiment of the present invention may have an average grain size of 50 to 100 ⁇ m. High-frequency iron loss is excellent in the above range. More specifically, the average grain size may be 75 to 95 ⁇ m.
- the iron loss (W 10/400 ) of the non-oriented electrical steel sheet may be 12.5 W/kg or less, and the magnetic flux density (B 50 ) may be 1.65T or more.
- the iron loss (W 10/400 ) is the iron loss when a magnetic flux density of 1.0T is induced at a frequency of 400HZ.
- the magnetic flux density (B 50 ) is the magnetic flux density induced in a magnetic field of 5000 A/m. More specifically, the iron loss (W 10/400 ) of the non-oriented electrical steel sheet is 11.0 to 12.5 W/kg, the magnetic flux density (B 50 ) may be 1.65 to 1.70T.
- a method of manufacturing a non-oriented electrical steel sheet according to an embodiment of the present invention comprises the steps of manufacturing molten steel; bubbling the molten steel for 5 to 10 minutes; manufacturing a slab by continuously casting molten steel; preparing a hot-rolled sheet by hot-rolling the slab; It includes the steps of manufacturing a cold-rolled sheet by cold-rolling the hot-rolled sheet and final annealing of the cold-rolled sheet.
- the alloy composition of the molten steel has been described in the alloy composition of the non-oriented electrical steel sheet, the overlapping description will be omitted. Since the alloy composition is not substantially changed in the manufacturing process of the non-oriented electrical steel sheet, the alloy composition of the non-oriented electrical steel sheet and the molten steel is substantially the same.
- molten steel is, by weight, Si: 2.0 to 3.8%, Al: 0.1 to 2.5%, Mn: 0.1 to 2.5%, Mo: 0.01 to 0.08%, Ti: 0.0010 to 0.0050%, Nb: 0.0010 to 0.0050%, C: 0.0020 to 0.0060% and N: 0.0010 to 0.0050%, including the balance Fe and unavoidable impurities, the following formula 1 may be satisfied.
- the manufacturing process of molten steel may be performed by a process known in the art.
- Mo , Ti and Nb which are the main elements in an embodiment of the present invention, can be adjusted by adding Mo, ferroalloy Ti, ferroalloy Nb, and the like.
- the molten steel is bubbled for 5 to 10 minutes.
- the bubbling at this time is bubbling after all alloy components are adjusted by adding raw materials such as Mo ferroalloy, Ti ferroalloy, and Nb ferroalloy, and is distinguished from bubbling in the deoxidation or desulfurization process.
- the existing molten steel manufacturing process such as deoxidation or desulfurization process in terms of bubbling after addition of raw materials such as Mo alloy, Ti alloy iron, and Nb alloy iron, using an inert gas, and input at a flow rate of 5Nm 3 or more It can be distinguished from the bubbling of
- the inert gas may be Ar gas.
- the flow rate may be 5 to 15Nm 3 .
- Bubbling may be performed for 5 to 10 minutes. By bubbling, Mo fully reacts with Ti and Nb to form a complete solution, and the density of carbonitrides in the final manufactured electrical steel sheet can be minimized. If the bubbling time is too short, the above-mentioned bubbling effect may be small. Even if the bubbling time is longer, it is difficult for Mo to react with Ti and Nb any more, and a problem may occur in terms of cost increase due to a decrease in productivity.
- a slab is manufactured by continuously casting molten steel.
- the slab manufacturing process may be performed by a process known in the art.
- the slab may be heated. Specifically, the slab can be charged to a heating furnace and heated to a temperature of 1,100°C or higher and 1,250°C or lower. If the heating temperature of the slab is too high, precipitates such as AlN, MnS, etc. present in the slab are re-dissolved and then finely precipitated during hot rolling and annealing to suppress grain growth and reduce magnetism.
- a hot-rolled sheet is manufactured by hot-rolling the slab.
- the thickness of the hot-rolled sheet may be 2 to 2.3 mm.
- the finish rolling temperature may be 800° C. or higher. Specifically, it may be 800 to 1000 °C.
- the hot-rolled sheet may be wound at a temperature of 700° C. or less.
- the step of annealing the hot-rolled sheet may be further included.
- the hot-rolled sheet annealing temperature may be 850 to 1150 °C. If the hot-rolled sheet annealing temperature is too low, the structure does not grow or grows fine, so it is not easy to obtain a texture advantageous for magnetism during annealing after cold rolling. If the annealing temperature is too high, magnetic crystal grains may grow excessively and surface defects of the plate may become excessive.
- the annealing of the hot-rolled sheet is performed to increase the orientation favorable to magnetism, if necessary, and may be omitted.
- the annealed hot-rolled sheet can be pickled. More specifically, the hot-rolled sheet annealing temperature may be 950 to 1150 °C.
- the hot-rolled sheet is cold-rolled to manufacture a cold-rolled sheet.
- the reduction may be performed by adjusting the reduction ratio to 70 to 85%.
- the cold rolling step may include one cold rolling step or two or more cold rolling steps with an intermediate annealing therebetween.
- the intermediate annealing temperature may be 850 to 1150 °C.
- the cold-rolled sheet is final annealed.
- the annealing temperature is not particularly limited as long as it is a temperature typically applied to the non-oriented electrical steel sheet. Since the iron loss of the non-oriented electrical steel sheet is closely related to the grain size, it is suitable if it is 8500 to 1000°C.
- the annealing time may be short-time annealing in 100 seconds or less.
- the average grain size may be 50 to 100 ⁇ m, and all (ie, 99% or more) of the processed structure formed in the previous cold rolling step may be recrystallized.
- an insulating film may be formed.
- the insulating film may be treated with an organic, inorganic, and organic/inorganic composite film, and may be treated with other insulating film materials.
- Table 1 S: Molten steel was prepared with components including 0.002 wt% and the remainder Fe and unavoidable impurities.
- Ar was introduced at a flow rate of 10Nm 3 and bubbled to prepare a slab.
- the slab was heated to 1,150° C. and hot-finish rolled at 850° C. to prepare a hot-rolled sheet having a thickness of 2.0 mm.
- the hot-rolled hot-rolled sheet was annealed at 1,100°C for 4 minutes and then pickled. Then, after cold rolling to a thickness of 0.25 mm, and final annealing at each temperature shown in Table 2, a non-oriented electrical steel sheet was manufactured.
- the initial permeability of 30 A/m was determined as the average value in the rolling and vertical directions by cutting a specimen of 60 mm in width ⁇ 60 mm in length ⁇ 5 sheets using a single sheet tester, and summarized in Table 2 below.
- the carbonitride density was summarized by observing the number of carbonitrides having a particle diameter of 0.1 ⁇ m or less on the TD surface of the specimen by SEM.
- the average grain size was observed with an electron microscope, and the results are summarized in Table 2 below.
- the grain growth properties are summarized in Table 2 below by calculating the cracking temperature (°C) of the final annealing step ⁇ the cracking time (min) of the final annealing step/average grain size ( ⁇ m).
- steel type 4 is added in excess with Mo, does not satisfy Equation 1, Mo forms a compound with Si, a large amount of fine carbonitride is formed, and magnetic permeability and magnetism are inferior.
- Equation 1 In steel grades 5 and 6, too little Mo is added, and it can be seen that Equation 1 is not satisfied, carbonitrides are formed in large amounts, and magnetic permeability and magnetism are inferior.
- steel grades 10 to 12 do not satisfy Equation 1, so that a large amount of carbonitride is formed, and magnetic permeability and magnetism are poor.
- steel type 14 contains an excess of N, a large amount of carbonitride is formed, and poor permeability and magnetism.
- steel type 15 contains a small amount of Nb and C, a large amount of Mo-Si compound is formed, a large amount of fine carbonitride is formed, and poor magnetic permeability and magnetism.
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Abstract
Description
강종 (wt%) |
Si | Al | Mn | 비저항 (μΩ·㎝) |
Mo | Ti | Nb | C | N | Ti+Nb+C+N | 식 1 값 |
1 | 3.4 | 0.5 | 0.2 | 58 | 0.020 | 0.002 | 0.002 | 0.0025 | 0.0015 | 0.0080 | 0.030 |
2 | 2.5 | 0.3 | 1.0 | 51 | 0.030 | 0.002 | 0.002 | 0.0025 | 0.0015 | 0.0080 | 0.030 |
3 | 2.5 | 1.5 | 1.5 | 67 | 0.040 | 0.002 | 0.002 | 0.0025 | 0.0015 | 0.0080 | 0.030 |
4 | 3.4 | 0.5 | 0.2 | 58 | 0.090 | 0.002 | 0.002 | 0.0025 | 0.0015 | 0.0080 | 0.090 |
5 | 3.4 | 0.5 | 0.2 | 58 | 0.005 | 0.002 | 0.002 | 0.0025 | 0.0015 | 0.0080 | 0.005 |
6 | 3.2 | 0.5 | 0.2 | 56 | 0.007 | 0.004 | 0.004 | 0.0040 | 0.0025 | 0.0145 | 0.009 |
7 | 3.2 | 0.5 | 0.3 | 57 | 0.030 | 0.002 | 0.002 | 0.0025 | 0.0015 | 0.0080 | 0.030 |
8 | 3.2 | 0.5 | 0.3 | 57 | 0.025 | 0.002 | 0.002 | 0.0025 | 0.0015 | 0.0080 | 0.030 |
9 | 3.4 | 0.5 | 0.5 | 60 | 0.030 | 0.002 | 0.0055 | 0.0025 | 0.0015 | 0.0115 | 0.056 |
10 | 3.1 | 0.5 | 0.5 | 57 | 0.080 | 0.005 | 0.005 | 0.0040 | 0.0015 | 0.0155 | 0.145 |
11 | 3.1 | 0.7 | 0.5 | 59 | 0.020 | 0.0005 | 0.002 | 0.0025 | 0.0020 | 0.0070 | 0.011 |
12 | 3.3 | 0.7 | 0.2 | 60 | 0.070 | 0.006 | 0.004 | 0.0010 | 0.0015 | 0.0125 | 0.280 |
13 | 3.3 | 0.7 | 0.2 | 60 | 0.035 | 0.004 | 0.004 | 0.0040 | 0.0025 | 0.0145 | 0.037 |
14 | 3.6 | 0.5 | 0.2 | 61 | 0.060 | 0.004 | 0.004 | 0.0040 | 0.0055 | 0.0175 | 0.051 |
15 | 3.6 | 0.5 | 0.2 | 61 | 0.040 | 0.001 | 0.0008 | 0.0008 | 0.0025 | 0.0051 | 0.022 |
강종 |
버블링 시간 (분) |
탄질화물 밀도 (개/mm2) |
소둔 온도 (℃) |
소둔 시간 (분) |
평균 결정립경 (㎛) |
결정립 성장성 | 투자율 (H=30A/m) |
자속밀도 (T) |
철손 (W/kg) |
비고 |
1 | 7 | 80 | 950 | 1 | 95 | 10 | 6230 | 1.67 | 12.0 | 실시예 |
2 | 8 | 88 | 950 | 1 | 78 | 21.2 | 5820 | 1.68 | 12.1 | 실시예 |
3 | 8 | 89 | 950 | 1 | 85 | 11.2 | 5620 | 1.65 | 11.5 | 실시예 |
4 | 9 | 120 | 950 | 1 | 55 | 17.3 | 3890 | 1.63 | 12.5 | 비교예 |
5 | 9 | 135 | 950 | 1 | 45 | 21.1 | 4520 | 1.64 | 12.8 | 비교예 |
6 | 7 | 140 | 950 | 1 | 62 | 15.3 | 4200 | 1.63 | 13.2 | 비교예 |
7 | 11 | 130 | 950 | 1 | 59 | 16.1 | 3870 | 1.64 | 12.9 | 비교예 |
8 | 8 | 90 | 950 | 1 | 72 | 13.2 | 5500 | 1.66 | 11.8 | 실시예 |
9 | 3 | 155 | 950 | 1 | 61 | 15.6 | 3690 | 1.62 | 13.5 | 비교예 |
10 | 6 | 125 | 950 | 1 | 40 | 23.8 | 4780 | 1.63 | 13.3 | 비교예 |
11 | 9 | 107 | 950 | 1 | 61 | 15.6 | 4150 | 1.64 | 12.7 | 비교예 |
12 | 7 | 135 | 950 | 1 | 35 | 27.1 | 3580 | 1.62 | 13.7 | 비교예 |
13 | 7 | 95 | 950 | 1 | 82 | 11.6 | 5100 | 1.67 | 11.6 | 실시예 |
14 | 10 | 150 | 950 | 1 | 51 | 18.6 | 4120 | 1.62 | 13.3 | 비교예 |
15 | 5 | 106 | 950 | 1 | 57 | 16.7 | 4360 | 1.64 | 12.6 | 비교예 |
Claims (10)
- 중량%로, Si : 2.0 내지 3.8%, Al: 0.1 내지 2.5%, Mn: 0.1 내지 2.5%, Mo: 0.01 내지 0.08%, Ti: 0.0010 내지 0.0050%, Nb: 0.0010 내지 0.0050%, C:0.0020 내지 0.0060% 및 N:0.0010 내지 0.0050% 포함하고, 잔부 Fe 및 불가피한 불순물을 포함하고,하기 식 1을 만족하고,0.1㎛ 이하의 입경을 갖는 탄화물, 질화물 및 탄질화물 중 1종 이상의 밀도가 100개/mm2 이하인 무방향성 전기강판.[식 1]0.02 ≤ ([Ti]+[Nb])×[Mo]/([C]+[N]) ≤ 0.05(식 1에서, [Ti], [Nb], [Mo], [C] 및 [N]은 각각 Ti, Nb, Mo, C 및 N의 함량(중량%)를 나타낸다.)
- 제1항에 있어서,Ti, Nb, C 및 N의 합량이 0.003 내지 0.015 중량%인 무방향성 전기강판.
- 제1항에 있어서,Sn : 0.015 내지 0.1 중량%, Sb: 0.015 내지 0.1 중량% 및 P : 0.005 내지 0.05 중량% 중 1종 이상을 더 포함하는 무방향성 전기강판.
- 제1항에 있어서,Cu: 0.01 중량% 이하, S: 0.005 중량% 이하, B : 0.002 중량% 이하, Mg : 0.005 중량% 이하 및 Zr : 0.005 중량% 이하 중 1종 이상을 더 포함하는 무방향성 전기강판.
- 제1항에 있어서,비저항이 50μΩ·㎝ 이상인 무방향성 전기강판.
- 제1항에 있어서,평균 결정립경이 50 내지 100㎛인 무방향성 전기강판.
- 제1항에 있어서,30A/m에서의 투자율이 5000이상인 무방향성 전기강판.
- 중량%로, Si : 2.0 내지 3.8%, Al: 0.1 내지 2.5%, Mn: 0.1 내지 2.5%, Mo: 0.01 내지 0.08%, Ti: 0.0010 내지 0.0050%, Nb: 0.0010 내지 0.0050%, C:0.0020 내지 0.0060% 및 N:0.0010 내지 0.0050% 포함하고, 잔부 Fe 및 불가피한 불순물을 포함하고, 하기 식 1을 만족하는 용강을 제조하는 단계;상기 용강을 5 내지 10분 동안 버블링하는 단계;상기 용강을 연속 주조하여 슬라브를 제조하는 단계;상기 슬라브를 열간 압연하여 열연판을 제조하는 단계;상기 열연판을 냉간압연 하여 냉연판을 제조하는 단계 및상기 냉연판을 최종 소둔하는 단계를 포함하는 무방향성 전기강판의 제조 방법.[식 1]0.02 ≤ ([Ti]+[Nb])×[Mo]/([C]+[N]) ≤ 0.05(식 1에서, [Ti], [Nb], [Mo], [C] 및 [N]은 각각 Ti, Nb, Mo, C 및 N의 함량(중량%)를 나타낸다.)
- 제8항에 있어서,상기 버블링하는 단계는 불활성 기체를 사용하고, 5Nm3이상의 유량으로 투입하는 무방향성 전기강판의 제조 방법.
- 제8항에 있어서,하기 식 2로 계산되는 결정립 성장성이 10 내지 15인 무방향성 전기강판의 제조 방법.[식 2]결정립 성장성 = 최종 소둔 단계의 균열 온도(℃) × 최종 소둔 단계의 균열 시간(분) / 평균 결정립경(㎛)
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US20130309525A1 (en) * | 2011-08-18 | 2013-11-21 | Nippon Steel & Sumitomo Metal Corporation | Non-oriented electrical steel sheet, manufacturing method thereof, laminate for motor iron core, and manufacturing method thereof |
KR101653142B1 (ko) * | 2014-12-24 | 2016-09-01 | 주식회사 포스코 | 무방향성 전기강판 및 그의 제조방법 |
KR101659808B1 (ko) * | 2015-05-20 | 2016-09-26 | 주식회사 포스코 | 무방향성 전기강판 및 그 제조방법 |
KR20180070950A (ko) * | 2016-12-19 | 2018-06-27 | 주식회사 포스코 | 무방향성 전기강판 및 그 제조방법 |
WO2020090160A1 (ja) * | 2018-10-31 | 2020-05-07 | Jfeスチール株式会社 | 無方向性電磁鋼板とその製造方法およびモータコアとその製造方法 |
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EP4265745A1 (en) | 2023-10-25 |
CN116867915A (zh) | 2023-10-10 |
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