WO2022139567A1 - 무방향성 전기강판 및 그 제조방법 - Google Patents
무방향성 전기강판 및 그 제조방법 Download PDFInfo
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- WO2022139567A1 WO2022139567A1 PCT/KR2021/095126 KR2021095126W WO2022139567A1 WO 2022139567 A1 WO2022139567 A1 WO 2022139567A1 KR 2021095126 W KR2021095126 W KR 2021095126W WO 2022139567 A1 WO2022139567 A1 WO 2022139567A1
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- Prior art keywords
- hot
- rolling
- steel sheet
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- oriented electrical
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- 229910000565 Non-oriented electrical steel Inorganic materials 0.000 title claims abstract description 50
- 238000004519 manufacturing process Methods 0.000 title claims description 40
- 238000005096 rolling process Methods 0.000 claims abstract description 75
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 22
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 21
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 15
- 239000010959 steel Substances 0.000 claims abstract description 15
- 239000012535 impurity Substances 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims description 45
- 238000000137 annealing Methods 0.000 claims description 36
- 238000005452 bending Methods 0.000 claims description 28
- 238000005098 hot rolling Methods 0.000 claims description 25
- 229910001566 austenite Inorganic materials 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000004804 winding Methods 0.000 claims description 14
- 230000009467 reduction Effects 0.000 claims description 13
- 238000005097 cold rolling Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 11
- 229910000859 α-Fe Inorganic materials 0.000 claims description 11
- 229910052717 sulfur Inorganic materials 0.000 claims description 8
- 230000008719 thickening Effects 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 52
- 239000011572 manganese Substances 0.000 description 26
- 230000005389 magnetism Effects 0.000 description 24
- 229910052742 iron Inorganic materials 0.000 description 21
- 238000011161 development Methods 0.000 description 18
- 230000018109 developmental process Effects 0.000 description 18
- 230000008569 process Effects 0.000 description 16
- 229910045601 alloy Inorganic materials 0.000 description 15
- 239000000956 alloy Substances 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 15
- 230000004907 flux Effects 0.000 description 13
- 239000010936 titanium Substances 0.000 description 12
- 239000000203 mixture Substances 0.000 description 10
- 239000010949 copper Substances 0.000 description 9
- 238000007792 addition Methods 0.000 description 8
- 229910052802 copper Inorganic materials 0.000 description 6
- 239000013078 crystal Substances 0.000 description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 230000009466 transformation Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 150000004767 nitrides Chemical class 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 150000001247 metal acetylides Chemical class 0.000 description 3
- 238000001953 recrystallisation Methods 0.000 description 3
- 150000003568 thioethers Chemical class 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 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
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000001887 electron backscatter diffraction Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000002609 medium Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- 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
- C21D7/00—Modifying the physical properties of iron or steel by deformation
- C21D7/02—Modifying the physical properties of iron or steel by deformation by cold working
- C21D7/10—Modifying the physical properties of iron or steel by deformation by cold working of the whole cross-section, e.g. of concrete reinforcing bars
-
- 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
- C21D8/1205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular fabrication or treatment of ingot or slab
-
- 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
- C21D8/1216—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
- C21D8/1238—Flattening; Dressing; Flexing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
- C21D8/1261—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest following hot rolling
-
- 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
- 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
-
- 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
- C22C38/02—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
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
- H01F1/14766—Fe-Si based alloys
- H01F1/14775—Fe-Si based alloys in the form of sheets
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- 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
Definitions
- One embodiment of the present invention relates to a non-oriented electrical steel sheet and a method for manufacturing the same. Specifically, it relates to a non-oriented electrical steel sheet in which annealing of the hot-rolled sheet is omitted and the magnetism is improved at the same time, and a method for manufacturing the same.
- Motors or generators are energy conversion devices that convert electrical energy into mechanical energy or mechanical energy into electrical energy. Accordingly, there is an increasing demand for development of materials having superior properties even in non-oriented electrical steel sheets used as materials for iron cores such as motors, generators and small transformers.
- energy efficiency is the ratio of input energy to output energy.
- energy loss such as iron loss, copper loss, and mechanical loss that is eventually lost in the energy conversion process can be reduced.
- the typical magnetic properties of non-oriented electrical steel sheet are iron loss and magnetic flux density. The lower the iron loss of non-oriented electrical steel sheet, the lower the iron loss lost in the process of iron core magnetization, the higher the efficiency. Since a larger magnetic field can be induced and a small current can be applied to obtain the same magnetic flux density, copper loss can be reduced and energy efficiency can be improved. Therefore, it can be said that it is essential to develop a non-oriented electrical steel sheet having low iron loss and excellent magnetism with high magnetic flux density to improve energy efficiency.
- a technique for improving the texture by performing an annealing process for a hot-rolled sheet after hot rolling of a slab before cold-rolling a hot-rolled sheet is widely used.
- this method also causes an increase in manufacturing cost due to the addition of a process called the hot-rolled sheet annealing process, and contains problems such as inferior cold rolling performance when the grains are coarsened by performing the hot-rolled sheet annealing process. Therefore, if a non-oriented electrical steel sheet having excellent magnetism can be manufactured without performing the hot-rolled sheet annealing process, the manufacturing cost can be reduced and the problem of productivity caused by the hot-rolled sheet annealing process can be solved.
- One embodiment of the present invention provides a non-oriented electrical steel sheet and a method for manufacturing the same. Specifically, to provide a non-oriented electrical steel sheet in which annealing of the hot-rolled sheet is omitted and magnetic properties are improved at the same time, and a method for manufacturing the same.
- Non-oriented electrical steel sheet according to an embodiment of the present invention by weight, C: 0.005% or less (excluding 0%), Si: 1.2 to 2.7%, Mn: 0.4 to 2.0%, S: 0.005% or less ( 0% or less), Al: 0.3% or less (excluding 0%), N: 0.005% or less (excluding 0%), Ti: 0.005% or less (excluding 0%)
- the remainder is Fe and unavoidable
- the volume fraction of crystal grains containing impurities, satisfying Equation 1 below, and having an angle between the ⁇ 112 ⁇ plane and the rolling plane of the steel sheet of 15° or less is 40 to 60%.
- the concentrated layer including Si oxide, Al oxide, or Si and Al complex oxide may exist in a depth range of 0.2 ⁇ m or less from the surface.
- the total amount of Si and Al may be 1.5 times or more of that of the substrate.
- the non-oriented electrical steel sheet according to an embodiment of the present invention may have an average grain size of 50 to 120 ⁇ m.
- Non-oriented electrical steel sheet according to an embodiment of the present invention by weight, C: 0.005% or less (excluding 0%), Si: 1.2 to 2.7%, Mn: 0.4 to 2.0%, S: 0.005% or less ( 0% or less), Al: 0.3% or less (excluding 0%), N: 0.005% or less (excluding 0%), Ti: 0.005% or less (excluding 0%)
- the remainder is Fe and unavoidable Heating a slab that contains impurities and satisfies the following Equation 1; preparing a hot-rolled sheet by hot-rolling the slab; bending the hot-rolled sheet; 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 elongation may be 0.1 to 0.5%.
- the step of annealing the hot-rolled sheet may not be included between the steps of manufacturing the cold-rolled sheet.
- the slab heating temperature SRT (°C) and the Ae1 temperature (°C) may satisfy the following relationship.
- the slab In the step of heating the slab, it can be maintained for 1 hour or more in the austenite single phase region.
- the step of hot rolling includes rough rolling and finishing rolling, and the finishing rolling start temperature (FET) may satisfy the following relationship.
- Ae1 is the temperature at which austenite is completely transformed into ferrite (°C)
- Ae3 is the temperature at which austenite is transformed into ferrite (°C)
- FET is the finishing rolling start temperature (°C).
- the step of hot rolling includes rough rolling and finishing rolling, and the rolling reduction of the finishing rolling may be 85% or more.
- the step of hot rolling includes rough rolling and finishing rolling, and the reduction ratio at the front end of finishing rolling may be 70% or more.
- the step of hot rolling includes rough rolling and finishing rolling, and the deviation of the finishing rolling termination temperature (FDT) in the entire length of the hot-rolled sheet may be 30° C. or less.
- FDT finishing rolling termination temperature
- the step of hot rolling includes rough rolling, finishing rolling and winding step, and the temperature (CT) in the winding step may satisfy the following relationship.
- the maximum number of times during the 90 ⁇ repeated bending test of the hot-rolled sheet is 30 or more, and the following relationship with the thickness of the hot-rolled sheet can be satisfied.
- the hot-rolled sheet In the step of repeatedly bending the hot-rolled sheet, it can be repeatedly bent 5 times or more.
- the magnetism is excellent.
- 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, C: 0.005% or less (excluding 0%), Si: 1.2 to 2.7%, Mn: 0.4 to 2.0%, S: 0.005% or less ( 0% or less), Al: 0.3% or less (excluding 0%), N: 0.005% or less (excluding 0%), Ti: 0.005% or less (excluding 0%)
- the remainder is Fe and unavoidable contains impurities.
- Carbon (C) combines with Ti to form carbide, which is inferior to magnetism, and when used after processing into electrical products in the final product, iron loss increases due to magnetic aging, thereby reducing the efficiency of electrical equipment. More specifically, C may be included in an amount of 0.0001 to 0.0045 wt%.
- Si is a major element added to increase the resistivity of steel to lower the eddy current loss during iron loss. When too little Si is added, a problem of deterioration of iron loss arises. Conversely, if Si is added too much, the austenite region is reduced, so if the hot-rolled sheet annealing process is omitted, the upper limit may be limited to 2.7 wt% in order to utilize the phase transformation phenomenon. More specifically, Si may include 1.80 to 2.60 wt%.
- Mn Manganese
- the amount of addition is small, the effect of increasing the specific resistance is small, and unlike Si and Al, an appropriate amount of Si and Al as an austenite stabilizing element is added according to the amount of addition. If it is excessive, the magnetic flux density may be greatly reduced. More specifically, Mn may be included in an amount of 0.80 to 1.50 wt%.
- S is an element that forms sulfides such as MnS, CuS, and (Cu,Mn)S that are harmful to magnetic properties, so it can be added as low as possible. If too much sulfur is added, the magnetism may be inferior due to the increase of fine sulfides. More specifically, S may include 0.0001 to 0.0030 wt%.
- Aluminum (Al) plays an important role in reducing iron loss by increasing specific resistance together with Si, but it is an element that stabilizes ferrite more than Si, and the magnetic flux density is greatly reduced as the amount added increases.
- the content of Al is limited.
- Al when Al is added to partially replace Si, there is an advantageous aspect in forming an oxide layer, so it can be partially replaced, and the addition amount can be limited to 0.30 wt% or less. More specifically, it may contain 0.0001 to 0.20 wt% of Al.
- N is an element harmful to magnetism, such as forming a nitride by strongly bonding with Al, Ti, etc. to suppress grain growth, and thus may be included in a small amount. More specifically, N may be included in an amount of 0.0001 to 0.0030% by weight.
- Titanium (Ti) forms fine carbides and nitrides by combining with C and N to inhibit grain growth, and as the amount of titanium (Ti) is increased, the texture deteriorates due to the increased carbides and nitrides, and thus magnetism may be included less. More specifically, it may include 0.0001 to 0.0030 wt% of Ti.
- P, Sn, and Sb which are known as elements for improving texture, may be added to further improve magnetism.
- the amount added is too large, there is a problem of suppressing grain growth and lowering productivity.
- Copper (Cu) is an element that forms (Mn,Cu)S sulfide together with Mn. When added in a large amount, copper (Cu) forms a fine sulfide and deteriorates magnetism, so the addition amount may be limited to 0.02 wt% or less. More specifically, Cu may include 0.0015 to 0.019 wt%.
- Ni, Cr, and Nb which are elements that are inevitably added in the steelmaking process, they react with impurity elements to form fine sulfides, carbides, and nitrides, which have a detrimental effect on magnetism. have.
- Zr, Mo, and V are strong carbonitride forming elements, it is preferable not to be added as much as possible, and each may be contained in an amount of 0.01 wt% or less.
- 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 above-described alloy components 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 may satisfy Equation 1.
- Equation 1 In the case of Al, the effect of stabilizing ferrite is very large, so the total content of Si+Al should be limited. If Equation 1 is satisfied, it has a sufficient austenite single-phase region at high temperature, and it is possible to secure a recrystallized structure after hot rolling through phase transformation during hot rolling. In addition, when Equation 1 is satisfied, it is possible to control the oxide layer formation by controlling the atmosphere in the annealing furnace during the final annealing.
- the volume fraction of grains having an angle between the ⁇ 112 ⁇ plane and the rolling plane of the steel sheet of 15° or less may be 40 to 60%.
- the volume fraction of the crystal grains having an angle between the ⁇ 112 ⁇ plane and the rolling plane of 15° or less is increased.
- the magnetism can be improved. More specifically, the volume fraction of crystal grains in which the ⁇ 112 ⁇ plane of the steel sheet is parallel within 15° may be 43.0 to 57.0%.
- the concentrated layer including Si oxide, Al oxide, or Si and Al complex oxide may exist in a depth range of 0.2 ⁇ m or less from the surface. Since the concentrating layer including Si oxide, Al oxide, or Si and Al complex oxide has inferior magnetism, it is necessary to control the formation thickness to be as thin as possible.
- the thickness of the thickening layer may be 0.20 ⁇ m or less. More specifically, the thickness of the thickening layer may be 0.01 to 0.15 ⁇ m.
- the total amount of Si and Al may be 1.5 times or more of that of the substrate.
- the O content may include 5 wt% or more.
- the thickening layer is distinguished from the steel sheet substrate in that the total amount of Si and Al is 1.5 times or more of the substrate, and the O content is 5% by weight or more.
- the control method of the thickening layer will be described in detail in the method for manufacturing a non-oriented electrical steel sheet to be described later.
- the non-oriented electrical steel sheet according to an embodiment of the present invention may have an average grain size of 50 to 120 ⁇ m.
- the measurement standard of the grain size may be a plane parallel to the rolling plane (ND plane).
- the grain size means a diameter of an imaginary circle having the same area.
- a method of controlling the grain size will be described in detail in the method for manufacturing a non-oriented electrical steel sheet to be described later.
- the non-oriented electrical steel sheet according to an embodiment of the present invention has excellent iron loss and magnetic flux density due to the above-described alloy components and properties.
- the iron loss (W15/50) when a magnetic flux density of 1.5 Tesla is induced at a frequency of 50 Hz may be 3.50 W/Kg or less. More specifically, it may be 2.30 to 3.50 W/Kg.
- the induced magnetic flux density (B50) may be 1.660 Tesla or more. More specifically, it may be 1.660 to 1.750 Tesla.
- the thickness of the magnetic measurement reference may be 0.50 mm.
- a method of manufacturing a non-oriented electrical steel sheet according to an embodiment of the present invention comprises the steps of heating a slab; preparing a hot-rolled sheet by hot-rolling the slab; bending the hot-rolled sheet; 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 slab has been described in the alloy composition of the non-oriented electrical steel sheet, the overlapping description will be omitted. Since the alloy composition is not substantially changed in the manufacturing process of the non-oriented electrical steel sheet, the alloy composition of the non-oriented electrical steel sheet and the slab is substantially the same.
- the slab is in weight%, C: 0.005% or less (excluding 0%), Si: 1.2 to 2.7%, Mn: 0.4 to 2.0%, S: 0.005% or less (excluding 0%), Al: 0.3% or less (excluding 0%), N: 0.005% or less (excluding 0%), Ti: 0.005% or less (excluding 0%)
- the remainder contains Fe and unavoidable impurities, and the following formula 1 can be satisfied
- the slab heating temperature SRT (°C) and the Ae1 temperature (°C) may satisfy the following relationship.
- the slab heating temperature is high enough to satisfy the above-mentioned range, it is possible to sufficiently secure a recrystallized structure after hot rolling, and even if the hot-rolled sheet annealing is not performed, the magnetism can be improved.
- Ae1 temperature (°C) is determined by the alloy composition of the slab. Since this is widely known in the technical field, a detailed description thereof will be omitted. For example, it can be calculated with commercial thermodynamic programs such as Thermo-Calc. and Factsage.
- the slab reheating temperature is too high, the precipitates are re-dissolved and finely precipitated in the hot rolling and annealing process. It is difficult to secure a post-recrystallization organization.
- the step of heating the slab it can be maintained for 1 hour or more in the austenite single phase region. This is the time required for coarsening of the precipitates, and is also necessary for coarsening the recrystallization structure after hot rolling by coarsening the crystallizer of austenite before hot rolling.
- a hot-rolled sheet is manufactured by hot-rolling the slab.
- the step of manufacturing a hot-rolled sheet by hot rolling may specifically include a rough rolling step, a finishing rolling step, and a winding step.
- the magnetism can be improved even if the hot-rolled sheet annealing is not performed.
- the rough rolling step is a step of rough rolling the slab to manufacture a bar (Bar).
- the finishing rolling step is a step of manufacturing a hot-rolled sheet by rolling a bar.
- the winding step is a step of winding the hot-rolled sheet.
- the rolling in the finishing rolling remains as a deformed structure, thereby refining the microstructure of the non-oriented electrical steel sheet, and also making the texture inferior, thereby greatly reducing the magnetism.
- the improvement effect of the texture by the strain energy is reduced, and finally the magnetism is greatly inferior.
- the cube goss and rotated cube, which are advantageous textures for magnetism among the textures after the final annealing, develop better, so that the magnetism can be improved.
- Ae1 is the temperature at which austenite is completely transformed into ferrite (°C)
- Ae3 is the temperature at which austenite is transformed into ferrite (°C)
- FET is the finishing rolling start temperature (°C).
- Ae1 temperature (°C) and Ae3 temperature (°C) are determined by the alloy composition of the slab.
- the reduction ratio in the finishing rolling can also contribute to the development of the texture described above.
- the rolling reduction of the finishing rolling may be 85% or more.
- the rolling reduction of the finishing rolling may be the cumulative reduction ratio of the plurality of passes. More specifically, the rolling reduction of the finishing rolling may be 85 to 90%.
- the reduction ratio at the final rolling shear may be 70% or more.
- the front end of finishing rolling means up to (the total number of passes)/2 when finishing rolling is performed with two or more even passes. When finishing rolling is performed with two or more odd passes, it means up to (total number of passes+1)/2. More specifically, the reduction ratio at the front end of the finishing rolling may be 70 to 87%.
- the deviation of the finishing rolling termination temperature (FDT) in the entire length of the hot-rolled sheet may be 30° C. or less. That is, the difference between the maximum temperature of the finishing rolling end temperature and the finishing rolling end temperature minimum temperature may be 30° C. or less.
- the deviation of the finishing rolling end temperature (FDT) may be small, it is possible to control the area fractions of the fine grains and the coarse grains after the final annealing. Ultimately, it has excellent magnetic properties even without hot-rolled sheet annealing. More specifically, the deviation of the finishing rolling termination temperature (FDT) in the entire length of the hot-rolled sheet may be 15 to 30 °C.
- the temperature (CT) in the winding step may satisfy the following relationship.
- CT represents the temperature (°C) in the winding step
- [Si+Al] represents the content (weight %) of Si+Al.
- the microstructure and repeated bending characteristics of the hot-rolled sheet are improved by the above-described finishing rolling termination temperature and winding temperature control.
- the microstructure of the hot-rolled sheet since the hot-rolled sheet annealing process is not performed, the microstructure of the hot-rolled sheet has a great influence on the microstructure of the non-oriented electrical steel sheet finally manufactured.
- the thickness of the hot-rolled sheet may be 2.0 to 3.0 mm. More specifically, it may be 2.3 mm to 2.5 mm.
- the maximum number of times of 90 ⁇ repeated bending test of hot-rolled sheet is 30 or more, and the following relationship with the thickness of hot-rolled sheet can be satisfied.
- the maximum number of repeated bending may be determined by the alloy composition of the above-described steel sheet and the slab heating and hot rolling conditions.
- the 90 ⁇ repeated bending test is to measure the degree to which bending deformation can be applied to the material by using a 20mm ⁇ 120mm specimen and measuring the maximum number of bendings until fracture by conducting the test with a bending radius of 10mmR. The higher the number of times, the more bending strain can be applied to the steel sheet.
- the hot-rolled sheet is bent.
- repeated bending is performed 5 or more times by applying tension before starting cold rolling, and as described above, in one embodiment of the present invention, a non-oriented electrical steel sheet with excellent magnetic properties even without hot-rolled sheet annealing through alloy composition and various process control. can be manufactured.
- the elongation due to repeated bending may be 0.1 to 0.5%. If the elongation rate is too low, the effect of improving the microstructure by bending may not be large. If the elongation is too high, non-uniform elongation is applied to the material, which can cause surface and property problems. More specifically, the elongation may be 0.2 to 0.4%.
- the applied tension may be 250 to 4000 kgf based on a width of 1000 mm.
- the step of annealing the hot-rolled sheet may not be included between the steps of manufacturing the cold-rolled sheet. That is, in an embodiment of the present invention, the step of annealing the hot-rolled sheet may be omitted. Specifically, after the step of manufacturing the hot-rolled sheet, the temperature of the steel sheet may be maintained at 300° C. or less between the steps of manufacturing the cold-rolled sheet.
- the hot-rolled sheet is cold-rolled to manufacture a cold-rolled sheet.
- Cold rolling is final rolling to a thickness of 0.10mm to 0.70mm. If necessary, secondary cold rolling may be performed after primary cold rolling and intermediate annealing, and the final rolling reduction may be in the range of 50 to 95%.
- 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 900 to 1100°C. If the temperature is too low, the hysteresis loss increases because the crystal grains are too fine.
- an insulating film may be formed.
- the insulating film may be treated with an organic, inorganic, and organic/inorganic composite film, and it is also possible to process with other insulating film materials.
- a slab containing the alloy components and the remainder Fe and unavoidable impurities summarized in Table 1 was prepared.
- the slab was heated at 1150° C., and then hot-rolled to the thickness listed in Table 2 below and then wound up.
- the wound hot-rolled steel sheet was bent at least 5 times before/after pickling without annealing the hot-rolled sheet, processed at the elongation shown in Table 2 below, cold-rolled to a thickness of 0.50 mm, and finally about 80 at the temperature summarized in Table 2 below.
- Cold-rolled sheet annealing was performed for a second.
- the manufactured final annealed plate was formed as an Epstein test piece with a length of 305 mm and a width of 30 mm for magnetic measurement from the L direction (rolling direction) and C direction (rolling vertical direction).
- the developed steels 1 to 8 that satisfy all of the alloy components and manufacturing processes proposed in an embodiment of the present invention have an angle between the ⁇ 112 ⁇ plane and the rolling plane of 15° or less. It can be confirmed that the volume fraction is properly formed and, ultimately, the magnetism is excellent.
- Comparative Material 1 In Comparative Material 1, it can be seen that Mn is added in excess, Al is added too little, the value of Equation 1 is not satisfied, the number of bending processes is small, and a large number of ⁇ 112 ⁇ crystal grains are generated, and the magnetism is inferior.
- Comparative Material 2 has an appropriate alloy component, but has a low elongation during bending, a large number of ⁇ 112 ⁇ grains are generated, and poor magnetism.
- Comparative material 3 and comparative material 4 did not satisfy the value of Equation 1, so it can be seen that the magnetism is inferior.
- Comparative material 5 had a high elongation during bending, so cold rolling was impossible.
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Abstract
Description
강종 | C | Si | Mn | S | Al | Ti | N | 식 1 값 |
비교재1 | 0.0017 | 2.70 | 0.251 | 0.0015 | 0.461 | 0.0016 | 0.0015 | 6.61 |
비교재2 | 0.0013 | 2.28 | 1.08 | 0.0013 | 0.003 | 0.0014 | 0.001 | 0.73 |
비교재 3 | 0.0021 | 1.79 | 1.87 | 0.0021 | 0.132 | 0.0010 | 0.0021 | 0.22 |
비교재 4 | 0.0013 | 2.25 | 0.76 | 0.0018 | 0.273 | 0.0015 | 0.0014 | 1.34 |
비교재 5 | 0.0008 | 2.54 | 1.38 | 0.0013 | 0.005 | 0.0014 | 0.0016 | 0.75 |
개발강1 | 0.0021 | 2.16 | 1.09 | 0.0016 | 0.152 | 0.0015 | 0.0017 | 0.74 |
개발강2 | 0.0015 | 2.32 | 1.11 | 0.0014 | 0.003 | 0.0014 | 0.0014 | 0.74 |
개발강3 | 0.002 | 2.33 | 1.11 | 0.0017 | 0.008 | 0.0015 | 0.0012 | 0.75 |
개발강4 | 0.0009 | 2.26 | 1.27 | 0.0009 | 0.193 | 0.0014 | 0.0011 | 0.75 |
개발강5 | 0.0012 | 2.41 | 1.32 | 0.0015 | 0.117 | 0.0015 | 0.0017 | 0.77 |
개발강6 | 0.0013 | 2.5 | 1.31 | 0.0012 | 0.004 | 0.0015 | 0.001 | 0.77 |
개발강7 | 0.0014 | 2.51 | 1.3 | 0.0018 | 0.006 | 0.0015 | 0.001 | 0.78 |
개발강8 | 0.0007 | 2.33 | 1.25 | 0.001 | 0.173 | 0.0015 | 0.0013 | 0.80 |
강종 | 열연판두께 (mm) |
반복굽힘 최대횟수 |
신장률 (%) |
최종소둔온도 (℃) |
철손 W15/50 | 자속밀도B50 (T) |
{112} 분율 (%) |
비교재1 | 2.3 | 27 | 0 | 1010 | 3.52 | 1.667 | 62.88 |
비교재2 | 2.5 | 42 | 0 | 1010 | 3.54 | 1.662 | 61.67 |
비교재3 | 2.3 | 49 | 0 | 980 | 3.73 | 1.677 | 70.54 |
비교재4 | 2.5 | 31 | 0.1 | 1010 | 3.66 | 1.672 | 65.38 |
비교재5 | 2.3 | 39 | 0.7 | 냉간압연 불가 | |||
개발강1 | 2.5 | 49 | 0.3 | 1010 | 2.82 | 1.690 | 52.24 |
개발강2 | 2.5 | 48 | 0.2 | 1010 | 2.91 | 1.689 | 51.42 |
개발강3 | 2.5 | 46 | 0.1 | 1010 | 2.94 | 1.692 | 55.49 |
개발강4 | 2.5 | 51 | 0.5 | 980 | 2.86 | 1.682 | 47.04 |
개발강5 | 2.5 | 51 | 0.4 | 1010 | 2.7 | 1.687 | 51.71 |
개발강6 | 2.5 | 40 | 0.5 | 1010 | 2.84 | 1.676 | 49.72 |
개발강7 | 2.3 | 43 | 0.3 | 1010 | 2.76 | 1.685 | 44.55 |
개발강8 | 2.3 | 45 | 0.1 | 1010 | 2.64 | 1.683 | 47.63 |
Claims (15)
- 중량%로, C: 0.005%이하(0%를 제외함), Si:1.2 내지 2.7%, Mn: 0.4 내지 2.0%, S: 0.005%이하(0%를 제외함), Al: 0.3% 이하(0%를 제외함), N:0.005% 이하(0%를 제외함), Ti: 0.005% 이하(0%를 제외함) 잔부는 Fe 및 불가피한 불순물을 포함하고,하기 식 1을 만족하고,강판 중 {112}면이 압연면과 이루는 각도가 15° 이하인 결정립의 부피 분율이 40 내지 60%인 무방향성 전기강판.[식 1]0.3 ≤ ([Si]+ [Al]-1.5)/[Mn] ≤ 0.85(식 1에서, [Si] 및 [Al], [Mn] 은 각각 Si, Al 및 Mn의 함량(중량%)을 나타낸다.)
- 제1항에 있어서,Si 산화물, Al 산화물 또는 Si 및 Al 복합 산화물을 포함하는 농화층이 표면으로부터 0.2㎛이하의 깊이 범위에 존재하는 무방향성 전기강판.
- 제2항에 있어서,상기 농화층은 Si 및 Al의 합량이 기재의 1.5배 이상인 무방향성 전기강판.
- 제1항에 있어서,평균 결정립 입경이 50 내지 120㎛인 무방향성 전기강판.
- 중량%로, C: 0.005%이하(0%를 제외함), Si:1.2 내지 2.7%, Mn: 0.4 내지 2.0%, S: 0.005%이하(0%를 제외함), Al: 0.3% 이하(0%를 제외함), N:0.005% 이하(0%를 제외함), Ti: 0.005% 이하(0%를 제외함) 잔부는 Fe 및 불가피한 불순물을 포함하고, 하기 식 1을 만족하는 슬라브를 가열하는 단계;상기 슬라브를 열간압연하여 열연판을 제조하는 단계;상기 열연판을 굽힘 가공하는 단계;상기 열연판을 냉간압연하여 냉연판을 제조하는 단계 및상기 냉연판을 최종소둔하는 단계를 포함하고,상기 열연판을 굽힘 가공하는 단계에서 신장율이 0.1 내지 0.5%인 무방향성 전기강판의 제조 방법.[식 1]0.3 ≤ ([Si]+ [Al]-1.5)/[Mn] ≤ 0.85(식 1에서, [Si] 및 [Al], [Mn] 은 각각 Si, Al 및 Mn의 함량(중량%)을 나타낸다.)
- 제5항에 있어서,상기 열연판을 제조하는 단계 이후, 상기 냉연판을 제조하는 단계 사이에 열연판을 소둔하는 단계를 포함하지 않는 무방향성 전기강판의 제조 방법.
- 제5항에 있어서,슬라브를 가열하는 단계에서, 오스테나이트가 페라이트로 100% 변태되는 평형 온도를 Ae1(℃)이라고 할 때, 슬라브 가열온도 SRT(℃)와 Ae1온도(℃)가 하기 관계를 만족하는 무방향성 전기강판의 제조 방법.SRT ≥ Ae1+150℃
- 제5항에 있어서,슬라브를 가열하는 단계에서, 오스테나이트 단상 영역에서 1시간 이상 유지하는 무방향성 전기강판의 제조 방법.
- 제5항에 있어서,상기 열간압연하는 단계는 조압연 및 사상압연 단계를 포함하고, 사상압연 시작 온도(FET)가 하기 관계를 만족하는 무방향성 전기강판의 제조 방법.Ae1 ≤ FET ≤ (2×Ae3+Ae1)/3(단, Ae1은 오스테나이트가 페라이트로 완전히 변태되는 온도(℃), Ae3은 오스테나이트가 페라이트로 변태되기 시작하는 온도(℃), FET는 사상압연 시작 온도(℃)를 나타낸다.)
- 제5항에 있어서,상기 열간압연하는 단계는 조압연 및 사상압연 단계를 포함하고,사상압연의 압하율이 85% 이상인 무방향성 전기강판의 제조 방법.
- 제5항에 있어서,상기 열간압연하는 단계는 조압연 및 사상압연 단계를 포함하고,사상압연 전단에서의 압하율이 70%이상인 무방향성 전기강판의 제조 방법.
- 제5항에 있어서,상기 열간압연하는 단계는 조압연 및 사상압연 단계를 포함하고,열연판 전체 길이에서 사상압연 종료 온도(FDT)의 편차가 30℃ 이하인 무방향성 전기강판의 제조 방법.
- 제5항에 있어서,상기 열간압연하는 단계는 조압연, 사상압연 및 권취 단계를 포함하고,귄취 단계에서의 온도(CT)가 하기 관계를 만족하는 무방향성 전기강판의 제조 방법.0.55≤CT×[Si]/1000≤1.75(단, CT는 귄취 단계에서의 온도(℃)를 나타내고, [Si]는 Si의 함량(중량%)을 나타낸다.)
- 제5항에 있어서,상기 열간압연하는 단계 이후, 열연판의 90˚반복굽힘 시험시 최대 횟수가 30회 이상이며 열연판 두께와 하기 관계를 만족하는 무방향성 전기강판의 제조 방법.반복굽힘 최대 횟수/열연판 두께(mm) ≥ 1.5
- 제5항에 있어서,상기 열연판을 반복 굽힘하는 단계에서 5회 이상 반복 굽힘하는 무방향성 전기강판의 제조 방법.
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EP (1) | EP4265750A1 (ko) |
JP (1) | JP2024500843A (ko) |
KR (1) | KR102438474B1 (ko) |
CN (1) | CN116848271A (ko) |
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JP2002115034A (ja) * | 2000-10-05 | 2002-04-19 | Sumitomo Metal Ind Ltd | 無方向性電磁鋼板とその冷延用素材ならびにその製造方法 |
JP2002371340A (ja) * | 2001-06-14 | 2002-12-26 | Sumitomo Metal Ind Ltd | 無方向性電磁鋼板及びその製造方法 |
KR20140041833A (ko) * | 2011-07-29 | 2014-04-04 | 신닛테츠스미킨 카부시키카이샤 | 굽힘성이 우수한 고강도 아연 도금 강판 및 그 제조 방법 |
KR20150073798A (ko) * | 2013-12-23 | 2015-07-01 | 주식회사 포스코 | 무방향성 전기강판 및 그 제조방법 |
KR20190077891A (ko) * | 2017-12-26 | 2019-07-04 | 주식회사 포스코 | 무방향성 전기강판의 제조방법 |
Family Cites Families (1)
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KR101722702B1 (ko) * | 2016-04-12 | 2017-04-03 | 주식회사 포스코 | 무방향성 전기강판 및 그 제조방법 |
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2020
- 2020-12-21 KR KR1020200179366A patent/KR102438474B1/ko active IP Right Grant
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2021
- 2021-12-16 WO PCT/KR2021/095126 patent/WO2022139567A1/ko active Application Filing
- 2021-12-16 JP JP2023537570A patent/JP2024500843A/ja active Pending
- 2021-12-16 EP EP21911632.4A patent/EP4265750A1/en active Pending
- 2021-12-16 MX MX2023007361A patent/MX2023007361A/es unknown
- 2021-12-16 CN CN202180093660.7A patent/CN116848271A/zh active Pending
Patent Citations (5)
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JP2002115034A (ja) * | 2000-10-05 | 2002-04-19 | Sumitomo Metal Ind Ltd | 無方向性電磁鋼板とその冷延用素材ならびにその製造方法 |
JP2002371340A (ja) * | 2001-06-14 | 2002-12-26 | Sumitomo Metal Ind Ltd | 無方向性電磁鋼板及びその製造方法 |
KR20140041833A (ko) * | 2011-07-29 | 2014-04-04 | 신닛테츠스미킨 카부시키카이샤 | 굽힘성이 우수한 고강도 아연 도금 강판 및 그 제조 방법 |
KR20150073798A (ko) * | 2013-12-23 | 2015-07-01 | 주식회사 포스코 | 무방향성 전기강판 및 그 제조방법 |
KR20190077891A (ko) * | 2017-12-26 | 2019-07-04 | 주식회사 포스코 | 무방향성 전기강판의 제조방법 |
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JP2024500843A (ja) | 2024-01-10 |
EP4265750A1 (en) | 2023-10-25 |
CN116848271A (zh) | 2023-10-03 |
KR20220089076A (ko) | 2022-06-28 |
MX2023007361A (es) | 2023-09-05 |
KR102438474B1 (ko) | 2022-09-01 |
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