WO2022113264A1 - 無方向性電磁鋼板およびその製造方法、ならびに熱延鋼板 - Google Patents
無方向性電磁鋼板およびその製造方法、ならびに熱延鋼板 Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 78
- 239000010959 steel Substances 0.000 title claims abstract description 78
- 238000004519 manufacturing process Methods 0.000 title claims description 29
- 239000000203 mixture Substances 0.000 claims abstract description 19
- 239000000126 substance Substances 0.000 claims abstract description 19
- 239000012535 impurity Substances 0.000 claims abstract description 14
- 238000000137 annealing Methods 0.000 claims description 59
- 229910000565 Non-oriented electrical steel Inorganic materials 0.000 claims description 57
- 239000013078 crystal Substances 0.000 claims description 47
- 238000000034 method Methods 0.000 claims description 32
- 238000005098 hot rolling Methods 0.000 claims description 30
- 239000006104 solid solution Substances 0.000 claims description 16
- 230000008569 process Effects 0.000 claims description 14
- 238000010438 heat treatment Methods 0.000 claims description 13
- 239000010960 cold rolled steel Substances 0.000 claims description 12
- 238000005554 pickling Methods 0.000 claims description 12
- 238000005097 cold rolling Methods 0.000 claims description 11
- 230000009467 reduction Effects 0.000 claims description 11
- 238000009628 steelmaking Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 8
- 230000001186 cumulative effect Effects 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 49
- 230000004907 flux Effects 0.000 description 21
- 229910052742 iron Inorganic materials 0.000 description 21
- 230000000694 effects Effects 0.000 description 17
- 238000000605 extraction Methods 0.000 description 15
- 239000002244 precipitate Substances 0.000 description 15
- 235000013339 cereals Nutrition 0.000 description 13
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 12
- 238000004080 punching Methods 0.000 description 12
- 150000004767 nitrides Chemical class 0.000 description 9
- 238000012360 testing method Methods 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 7
- 238000005096 rolling process Methods 0.000 description 7
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 5
- 238000001556 precipitation Methods 0.000 description 5
- 229910052719 titanium Inorganic materials 0.000 description 5
- 229910000532 Deoxidized steel Inorganic materials 0.000 description 4
- OKIZCWYLBDKLSU-UHFFFAOYSA-M N,N,N-Trimethylmethanaminium chloride Chemical compound [Cl-].C[N+](C)(C)C OKIZCWYLBDKLSU-UHFFFAOYSA-M 0.000 description 4
- 238000005868 electrolysis reaction Methods 0.000 description 4
- 238000004993 emission spectroscopy Methods 0.000 description 4
- 230000002401 inhibitory effect Effects 0.000 description 4
- 229910052748 manganese Inorganic materials 0.000 description 4
- 229910052758 niobium Inorganic materials 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 229910052720 vanadium Inorganic materials 0.000 description 4
- 229910052726 zirconium Inorganic materials 0.000 description 4
- 239000011162 core material Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 238000002791 soaking Methods 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 150000003568 thioethers Chemical class 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 150000001247 metal acetylides Chemical class 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910001224 Grain-oriented electrical steel Inorganic materials 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- VASIZKWUTCETSD-UHFFFAOYSA-N manganese(II) oxide Inorganic materials [Mn]=O VASIZKWUTCETSD-UHFFFAOYSA-N 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000000879 optical micrograph Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular fabrication or treatment of ingot or slab
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
- C21D8/1222—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
- C21D8/1233—Cold rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
- C21D8/1261—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest following hot rolling
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
- C21D8/1272—Final recrystallisation annealing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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
Definitions
- the present invention relates to a non-oriented electrical steel sheet, a method for manufacturing the same, and a hot-rolled steel sheet as a material for the non-oriented electrical steel sheet.
- Steel sheets required for general-purpose models have a Si content of 1.5% or less, and by promoting crystal grain growth during strain relief annealing performed after motor core punching, iron loss is dramatically improved. It is a material to be used.
- Patent Document 1 As a means for improving crystal grain growth during strain removal annealing, for example, in Patent Document 1, C; ⁇ 0.065%, Si; ⁇ 2.0%, Al; ⁇ 0.10%, O; ⁇ 0.020%, B / N; 0.50 to 2.50, hot rolled sheet obtained by hot rolling a steel slab consisting of the balance Fe and unavoidable impurities, including one cold rolling or intermediate annealing. Disclosed is a method for producing an electric iron plate having excellent magnetic properties, which is characterized in that the final size is obtained by cold rolling two or more times and further annealing is performed.
- Patent Document 2 C: 0.015% or less, Si: 0.1 to 1.0%, sol. Al: 0.001 to 0.005%, Mn: 1.5% or less, S: 0.008% or less, N: 0.0050% or less, T.I. O: In non-oriented electrical steel sheets containing 0.02% or less, the ratio of the weight of MnO to the total weight of the three types of inclusions of SiO 2 , MnO, and Al 2 O 3 in the steel is 15% or less. Disclosed is a non-oriented electrical steel sheet having a small iron loss and capable of achieving an average crystal grain size of 50 ⁇ m or more after magnetic baking.
- Patent Document 3 describes C: 0.01% or less in weight%, Si: 0.1% or more and 2.0% or less, Mn: 0.1% or more and 1.5% or less, and a method for deoxidizing steel.
- a non-oriented electrical steel sheet containing Al: 0.1% or less or Zr: 0.05% or less and composed of residual iron and unavoidable impurity elements the oxide in the steel has a diameter of 0.5 ⁇ m or more and 5 ⁇ m.
- Patent Document 4 in terms of mass%, C: 0.0050% or less, Si: 0.05 to 3.5%, Mn: 3.0% or less, Al: 3.0% or less, S: 0.008%.
- P 0.15% or less
- N 0.0050% or less
- Cu 0.2% or less are contained, and (S which is a Cu sulfide) / (S in steel) ⁇ 0.2, or ( A steel satisfying S) / (S) which is a Cu sulfide / (S) which is a Mn sulfide, and the number density of the sulfide containing Cu having a diameter of 0.03 to 0.20 ⁇ m in the steel plate is 0. .5 pieces / ⁇ m 3 or less non-directional electromagnetic steel sheets are disclosed.
- Patent Document 5 in mass%, Si: 1.5% or less, Mn: 0.4% or more and 1.5% or less, Sol. Al: 0.01% or more and 0.04% or less, Ti: 0.0015% or less, N: 0.0030% or less, S: 0.0010% or more and 0.0040% or less, B is 0. It contains 5 or more and 1.5 or less, and consists of the balance Fe and unavoidable impurities.
- B is 0. It contains 5 or more and 1.5 or less, and consists of the balance Fe and unavoidable impurities.
- the sulfides containing Mn 10% or more is complex-precipitated with B precipitates, and MnS, Cu 2 S and its composite sulfides are formed.
- the total distribution density is 3.0 ⁇ 10 5 pieces / mm 2 or less, and the distribution density of Ti precipitates less than 0.1 ⁇ m in diameter is 1.0 ⁇ 10 3 pieces / mm 2 or less.
- Non-directional electromagnetic steel sheets are disclosed.
- Japanese Unexamined Patent Publication No. 54-163720 Japanese Unexamined Patent Publication No. 63-195217 Japanese Unexamined Patent Publication No. 3-104844 Japanese Unexamined Patent Publication No. 2004-2954 International Publication No. 2005/100627
- Patent Document 1 and Patent Document 5 in Al deoxidized steel, about 0.002% of B is added to generate BN as a nitride and suppress the precipitation of AlN harmful to crystal grain growth.
- the technique has a problem that the magnetic flux density is lower than that of Si deoxidation described in Patent Documents 2 and 4, even if a low iron loss is obtained.
- Patent Document 5 discloses the effect of improving the magnetic flux density by adding Sn, but this technique has a problem of increasing the cost.
- the present invention has been made in view of such a problem, and it suppresses the formation of AlN, reduces the solid solution B (sol.B), and has good crystal grain growth after strain-removal annealing.
- Another object of the present invention is to provide a non-oriented electrical steel sheet having good iron loss and magnetic flux density, a method for manufacturing the non-oriented electrical steel sheet, and a hot-rolled steel sheet that can be used as a material for the non-oriented electrical steel sheet.
- the present invention has been made to solve the above problems, and the gist thereof is the following non-oriented electrical steel sheet, its manufacturing method, and hot-rolled steel sheet.
- the chemical composition is mass%.
- C 0.0010 to 0.0050%, Si: 1.50% or less, Mn: 0.10 to 1.50%, sol.
- Al 0.010 to 0.040%, Ti: 0.0030% or less, Nb: 0.0030% or less, V: 0.0030% or less, Zr: 0.0030% or less, N: 0.0030% or less, S: 0.0040% or less, B: 0.0045% or less, Remaining: Fe and impurities, Satisfy the following equations (i) to (iv), Non-oriented electrical steel sheet. 0.0020 ⁇ Ti + Nb + V + Zr ⁇ 0.0120 ... (i) 0.5 ⁇ B / N ⁇ 1.5 ... (ii) sol.
- the average crystal grain size is 30 ⁇ m or less, and The average crystal grain size after strain relief annealing under the condition of holding at 750 ° C. for 2 hours is 50 ⁇ m or more.
- the hot rolling process Before hot rolling, the slab is kept at a temperature of 1000 to 1050 ° C. for 30 minutes or more.
- the cumulative reduction rate in the temperature range of 900 to 1000 ° C is set to 70% or more.
- the temperature of the hot-rolled steel sheet is maintained at 700 ° C. or higher and lower than 780 ° C. for 30 minutes or longer. Manufacturing method of non-oriented electrical steel sheet.
- the time for heating to the maximum temperature reached at 800 ° C. or higher and lower than 850 ° C. at an average heating rate of 20 ° C./s or higher and the temperature of the cold-rolled steel sheet at 800 ° C. or higher is 15 seconds.
- the chemical composition is by mass%, C: 0.0010 to 0.0050%, Si: 1.50% or less, Mn: 0.10 to 1.50%, sol. Al: 0.010 to 0.040%, Ti: 0.0030% or less, Nb: 0.0030% or less, V: 0.0030% or less, Zr: 0.0030% or less, N: 0.0030% or less, S: 0.0040% or less, B: 0.0045% or less, Remaining: Fe and impurities, Satisfy the following equations (i) to (iv), Hot-rolled steel sheet.
- the chemical composition is, instead of a part of the Fe, by mass%.
- Sn 0.50% or less, Contains, The hot-rolled steel sheet according to (6) above.
- the present inventors investigated the reason why the magnetic flux density of Al deoxidized steel containing about 0.002% of B was lower than that of Si deoxidized steel, focusing on the existence form of B.
- B has the effect of suppressing the precipitation of AlN, which is extremely harmful to crystal grain growth. This is because B is easier to form a nitride than Al.
- the present inventors have found that when excess B is contained in the non-oriented electrical steel sheet, B exists in a solid solution state and reduces the magnetic flux density (see FIG. 1).
- the solid solution B amount does not increase due to the excess B, but AlN is generated by the surplus N and the crystal grain growth deteriorates. Therefore, it is preferable to increase the B content as much as possible within a range that does not cause solid solution B, but it is industrially difficult to control the B content with high accuracy.
- the nitride-forming elements include Ti, Nb, V, Zr, etc. in addition to Al and B, and their presence must be taken into consideration when controlling the B content. This is because it is usually mixed in non-oriented electrical steel sheets as impurities, and it is difficult to accurately grasp the amount.
- the N content of the non-oriented electrical steel sheet can also fluctuate in the steelmaking process, it is difficult to accurately grasp the amount of B to be charged. As described above, it is industrially extremely difficult to include a sufficient amount of B in the non-oriented electrical steel sheet in order to suppress the formation of AlN.
- the slab before annealing is heat-treated to hold it in a temperature range of 1000 to 1050 ° C for 30 minutes or more, and the steel sheet after annealing is subjected to a temperature range of 700 ° C or more and less than 780 ° C for 30 minutes or more.
- the formation of AlN can be avoided, and in the finish annealing of the steel sheet after cold rolling or the strain relief annealing of the non-directional electromagnetic steel sheet after the finish annealing, the crystal grain growth becomes good and the low iron It was found that a loss and a high magnetic flux density can be obtained.
- C 0.0010-0.0050% C has the effect of fixing the solid solution B as a carbide. However, if an amount of C exceeding 0.0050% is contained, the iron loss is deteriorated by magnetic aging. Therefore, the C content is set to 0.0010 to 0.0050%.
- the C content is preferably 0.0015% or more, 0.0020% or more, or 0.0025% or more.
- the C content is preferably 0.0045% or less, 0.0040% or less, or 0.0035% or less.
- Si 1.50% or less Si is an effective element for increasing electrical resistance. However, if the Si content exceeds 1.50%, the hardness increases, the magnetic flux density decreases, the manufacturing cost increases, and the like. Therefore, the Si content is 1.50% or less.
- the Si content is preferably 1.30% or less, 1.00% or less, or 0.80% or less.
- the lower limit of the Si content is 0%, but in order to obtain the above-mentioned effects, the Si content is preferably 0.10% or more, 0.20% or more, or 0.50% or more.
- Mn 0.10 to 1.50%
- Mn is a sulfide-forming element, and is preferably contained in an appropriate amount from the viewpoint of promoting crystal grain growth.
- the Mn content is set to 0.10 to 1.50%.
- the Mn content is preferably 0.30% or more, 0.50% or more, or 0.70% or more.
- the Mn content is preferably 1.20% or less, 1.00% or less, or 0.80% or less.
- sol. Al 0.010 to 0.040%
- Al is an element required for deoxidation of steel. sol. If the content of Al (Al existing in a solid solution state) is less than 0.010%, a stable deoxidizing effect cannot be obtained, and problems such as nozzle clogging occur. On the other hand, from the viewpoint of scrap utilization by consumers, it is preferable that the Al content is low. Therefore, sol.
- the Al content is 0.010 to 0.040%. sol.
- the Al content is preferably 0.015% or more, 0.020% or more, or 0.025% or more.
- sol. The Al content is preferably 0.035% or less, 0.030% or less, or 0.028% or less.
- Ti 0.0030% or less Ti produces nitrides and significantly deteriorates grain growth.
- Ti is an element mixed in steel as an impurity, it is industrially difficult to reduce the Ti content to zero. Further, a very small amount of Ti has an effect of suppressing the formation of AlN.
- the Ti content is set to 0.0030% or less.
- the Ti content is preferably 0.0025% or less, 0.0020% or less, or 0.0015% or less.
- the Ti content is preferably 0.0005% or more, 0.0008% or more, 0.0010% or more, or 0.0012% or more.
- Nb 0.0030% or less Nb produces a nitride and significantly deteriorates grain growth.
- Nb is an element mixed in steel as an impurity, it is industrially difficult to reduce the Nb content to zero. Further, a very small amount of Nb has an effect of inhibiting the production of AlN.
- the Nb content is set to 0.0030% or less.
- the Nb content is preferably 0.0025% or less, 0.0020% or less, or 0.0015% or less.
- the Nb content is preferably 0.0005% or more, 0.0008% or more, 0.0010% or more, or 0.0012% or more.
- V 0.0030% or less V produces a nitride and significantly deteriorates grain growth.
- V is an element mixed in steel as an impurity, it is industrially difficult to reduce the V content to zero. Further, a very small amount of V has an effect of inhibiting the production of AlN.
- the V content is set to 0.0030% or less.
- the V content is preferably 0.0025% or less, 0.0020% or less, or 0.0015% or less.
- the V content is preferably 0.0005% or more, 0.0008% or more, 0.0010% or more, or 0.0012% or more.
- Zr 0.0030% or less Zr produces nitrides and significantly deteriorates grain growth.
- Zr is an element mixed in steel as an impurity, it is industrially difficult to reduce the Zr content to zero.
- a very small amount of Zr has an effect of inhibiting the production of AlN.
- the Zr content is set to 0.0030% or less.
- the Zr content is preferably 0.0025% or less, 0.0020% or less, or 0.0015% or less.
- the Zr content is preferably 0.0005% or more, 0.0008% or more, 0.0010% or more, or 0.0012% or more.
- any one of Ti, Nb, V and Zr may be contained alone, or two or more thereof may be contained in combination.
- the total content of these elements satisfies the following formula (i). 0.0020 ⁇ Ti + Nb + V + Zr ⁇ 0.0120 ... (i)
- the element symbol in the above formula (i) represents the content (mass%) of each element.
- N 0.0030% or less N produces a nitride harmful to crystal grain growth.
- the upper limit of the N content is set to 0.0030%.
- the N content is preferably 0.0025% or less, 0.0020% or less, or 0.0015% or less. It is preferable to reduce the N content as much as possible, but since N is an element mixed in steel as an impurity, it is industrially difficult to reduce the N content to zero.
- the lower limit of the N content is defined by the relational expression with the B content described later.
- the lower limit of the N content may be set separately.
- the N content may be 0.0008% or more, 0.0010% or more, or 0.0012% or more.
- the N content means the content of N in all forms including N AlN , which will be described later, and N constituting BN.
- S 0.0040% or less S forms sulfides and significantly deteriorates grain growth.
- the S content is set to 0.0040% or less.
- the S content is preferably 0.0035% or less, 0.0030% or less, or 0.0025% or less.
- the lower limit of the S content is 0%, but the S content may be 0.0008% or more, 0.0010% or more, or 0.0012% or more in consideration of the refining cost.
- B 0.0045% or less B is an essential element for suppressing the production of AlN, which is harmful to crystal grain growth. Therefore, the B content is determined in the range of 0.0045% or less and according to the above-mentioned N content. Specifically, the B content is controlled so as to satisfy the following equation (ii).
- the B content means the content of all forms of B including solid solution B (sol. B) and B forming a precipitate such as BN. Setting the B / N value to 0.5 to 1.5 is one of the important means for achieving both the reduction of the amount of solid solution B and the suppression of the production of AlN.
- the B / N value is preferably 0.6 or more, 0.7 or more, or 0.8 or more.
- the B / N is preferably 1.4 or less, 1.3 or less, or 1.0 or less. 0.5 ⁇ B / N ⁇ 1.5 ... (ii) However, the element symbol in the above equation (ii) represents the content (mass%) of each element.
- the content of B shall also be specified.
- the content of B is 0.0005% or less as an upper limit that does not affect the magnetic flux density. That is, sol.
- the content of B needs to satisfy the following formula (iii). sol. B ⁇ 0.0005 ⁇ ⁇ ⁇ (iii)
- the content of B is preferably 0.0004% or less, or 0.0003% or less.
- sol. The content of B may be defined as 0.00005% or more, 0.00010% or more, or 0.00015% or more.
- the content of B is measured by the following procedure. First, a test piece is cut out from a non-directional electromagnetic steel sheet or a hot-rolled steel sheet, and electrolyzed with 10% acetylacetone-1% tetramethylammonium chloride / methanol at a current density of 20 mA / cm 2 in an amount of about 0.4 g. The solution used for the electrolysis is filtered through a filter having a pore size of 0.2 ⁇ m, and the B content in the extraction residue is measured by using ICP emission spectroscopy for the extraction residue collected on the filter. Then, the value obtained by subtracting the B content in the extraction residue from the B content in the steel is calculated as sol. Let it be the content of B.
- Sn 0.50% or less Since Sn is not essential in the present invention, the lower limit of its content is 0%. From the viewpoint of alloy cost reduction, it is preferable that the Sn content is reduced as much as possible. However, Sn has the effect of improving the magnetic flux density. In addition to this, Sn is also effective in suppressing nitriding and oxidation of the surface of the steel sheet during annealing. In addition, sol. When Al: contains 0.010 to 0.040%, Sn is particularly liable to be nitrided. Therefore, Sn may be contained if necessary. Specifically, the Sn content is preferably 0.01% or more, 0.02% or more, or 0.05% or more.
- the Sn content is 0.40% or less, 0.30% or less, 0.20% or less, 0.10% or less, 0.09% or less. , Or 0.08% or less.
- N AlN The content of N (hereinafter referred to as "N AlN ”) constituting the precipitate AlN shall be 0.0005% or less as an upper limit that does not affect the crystal grain growth. That is, the content of N AlN must satisfy the following equation (iv). N AlN ⁇ 0.0005 ⁇ ⁇ ⁇ (iv)
- the content of N AlN is preferably 0.0004% or less, or 0.0003% or less. Since it is preferable to reduce the content of N AlN as much as possible, the lower limit of the content is 0%. On the other hand, the content of N AlN may be defined as 0.00005% or more, 0.00010% or more, or 0.00015% or more.
- the content of N AlN is measured by the following procedure. First, a test piece is cut out from a non-directional electromagnetic steel sheet or a hot-rolled steel sheet, and electrolyzed with 10% acetylacetone-1% tetramethylammonium chloride / methanol at a current density of 20 mA / cm 2 in an amount of about 0.4 g. The solution used for the electrolysis is filtered through a filter having a pore size of 0.2 ⁇ m, and the Al content in the extraction residue is measured by using ICP emission spectroscopy for the extraction residue collected on the filter. Since it is considered that all Al in the extraction residue exists as AlN, the N content in the extraction residue is obtained by multiplying the Al content in the extraction residue by 14/27, and the N AlN content is obtained. And.
- the state of the precipitate is very important, but the state of the precipitate is not particularly specified. This is because the precipitates are so fine that it is technically difficult to define their condition. Further, it has been confirmed that by keeping the amount of N AlN constituting the precipitate within the above range, the precipitate is well controlled and the magnetic properties of the non-oriented electrical steel sheet are improved.
- the average crystal grain size of the non-oriented electrical steel sheet according to this embodiment is not particularly specified. As described above, the non-oriented electrical steel sheet is used after being machined and annealed by strain, so that the average crystal grain size changes depending on the conditions of annealing by strain. Considering the above-mentioned actual usage, it is not essential to specify the average crystal grain size at the stage of grain-oriented electrical steel sheet as long as the grain growth property in strain annealing is good. On the other hand, the average crystal grain size is an important factor from the viewpoint of improving punching workability. In non-oriented electrical steel sheets used for punching, when the average crystal grain size is 30 ⁇ m or less, the punching workability is improved. Therefore, the average crystal grain size of the non-oriented electrical steel sheet after finish annealing may be 30 ⁇ m or less. As a means for reducing the average crystal grain size to 30 ⁇ m or less, a known technique can be appropriately used.
- non-oriented electrical steel sheets are subjected to machining and strain removal annealing after shipment.
- the average crystal grain size after the strain-removing annealing is 50 ⁇ m or more, the iron loss characteristics are extremely improved.
- the chemical composition and the state of the oxide of the non-oriented electrical steel sheet according to the present embodiment are preferably controlled, the average crystal grain size after strain removal and annealing under the condition of holding at 750 ° C. for 2 hours is 50 ⁇ m or more. It becomes.
- the strain-removing annealing conditions are not limited to the above conditions, and the annealing temperature and time may be appropriately changed in consideration of both equipment restrictions and promotion of crystal grain growth.
- the average crystal grain size of the non-oriented electrical steel sheet can be obtained by the following method.
- the L cross section (cross section parallel to the rolling direction) of the non-directional electromagnetic steel plate is polished and etched, and observed with an optical microscope.
- the observation magnification is 100 times, the area of the observation field of view is 0.5 mm 2 , and the number of observation points is 3.
- JIS G 0551: 2013 "Steel-grain size microscopic test method" to these optical micrographs, the average crystal grain size of the non-oriented electrical steel sheet is obtained.
- the manufacturing method of the non-directional electromagnetic steel plate according to the present embodiment includes a steelmaking process, a hot rolling process, a pickling process, a cold rolling process, and a finish annealing process.
- (A) Steelmaking process In the steelmaking process, slabs having the above-mentioned chemical composition are produced by appropriately refining and casting.
- the manufacturing conditions are not particularly limited in the steelmaking process, and known conditions can be appropriately adopted.
- Hot-rolling process In the hot-rolling process, the slab obtained by the continuous casting process is heated and then hot-rolled to obtain a hot-rolled steel sheet. By this step, a hot-rolled steel sheet according to an embodiment of the present invention is manufactured.
- the steps after the hot rolling step do not substantially affect the chemical composition and the state of the oxide. Therefore, as described above, the chemical composition and the state of precipitates of the hot-rolled steel sheet are common to those of the non-oriented electrical steel sheet according to the present embodiment.
- the hot rolling process is an important process for controlling deposits and ensuring magnetic properties.
- the slab is kept at a temperature of 1000 to 1050 ° C. for 30 minutes or more before hot rolling. Subsequently, hot rolling is performed so that the cumulative rolling reduction in the temperature range of 900 to 1000 ° C. is 70% or more. Then, after hot rolling, the temperature of the hot-rolled steel sheet is maintained at 700 ° C. or higher and lower than 780 ° C. for 30 minutes or longer.
- the AlN content when the B content is excessive with respect to the N content, the AlN content can be suppressed by fixing N with B, so that the N AlN content can be set to 0.0005% or less. It is possible.
- the B content may exceed 0.0005%. Therefore, it is necessary to generate B precipitates other than BN to suppress the solid solution B content.
- B produces carbides, the precipitation temperature of B carbides is relatively low. Therefore, it is possible to promote the precipitation of B carbide by setting the cumulative reduction rate in the temperature range of 900 to 1000 ° C. to 70% or more.
- the B carbide is promoted by hot rolling under the above conditions, some B may remain in the solid solution state and remain in the hot-rolled steel sheet.
- the solid solution B can be precipitated by holding the hot-rolled steel sheet for 30 minutes or more within the range where the temperature of the hot-rolled steel sheet is 700 ° C. or higher and lower than 780 ° C. This is because the B carbide does not precipitate even if the holding temperature is less than 700 ° C., and dissolves if the holding temperature is 780 ° C. or higher.
- sol. B can be 0.0005% or less, but it is necessary to suppress the production of AlN.
- the formation of Ti, Nb, V, and Zr nitrides suppresses the formation of AlN, which is harmful to crystal grain growth. Since these nitrides are relatively fine, they need to be sufficiently grown in this step. Therefore, before hot rolling, the temperature of the slab is kept within the range of 1000 to 1050 ° C for 30 minutes or more, and after hot rolling, the temperature of the hot-rolled steel sheet is 700 ° C or higher and lower than 780 ° C. Hold for 30 minutes or more within the range that becomes. This makes it possible to reduce the N AlN content to 0.0005% or less by fixing N with Ti, Nb, V, and Zr and suppressing the AlN amount.
- the rolling reduction in the hot rolling process is not particularly limited, but is preferably 90% or more.
- the thickness of the obtained hot-rolled steel sheet is also not particularly limited, but is preferably 1.0 to 4.0 mm, more preferably 2.0 to 3.0 mm.
- (C) Pickling step In the pickling step, the hot-rolled steel sheet obtained by the hot-rolling step is pickled.
- the pickling conditions are not particularly limited, and may be within the normal range in the manufacturing conditions of the non-oriented electrical steel sheet.
- (D) Cold-rolled step In the cold-rolled step, the hot-rolled steel sheet after pickling is cold-rolled to obtain a cold-rolled steel sheet.
- the cold rolling conditions are not particularly limited, and may be within the normal range in the manufacturing conditions of non-oriented electrical steel sheets.
- the rolling reduction in the cold rolling step is preferably 50 to 95%, more preferably 75 to 85%.
- finish annealing step finish annealing is performed on the cold-rolled steel sheet obtained by the cold-rolling step.
- the conditions are not particularly limited, and known conditions can be appropriately used.
- the heating rate in the finish annealing step is 20 ° C./s or more.
- the heating rate is a value obtained by dividing the difference between the heating start temperature and the soaking temperature of the cold-rolled steel plate by the time from the heating start temperature to the soaking temperature, that is, from the heating start temperature to the soaking temperature. Is the average heating rate of.
- the maximum temperature reached (the temperature of the cold-rolled steel sheet) is 850 ° C. or higher, the crystal grain size becomes too large, and there is a possibility that defects occur in the punching process performed before the strain-removal annealing. ..
- the maximum temperature reached is preferably less than 850 ° C.
- the maximum temperature reached is less than 800 ° C., recrystallization may be insufficient and defects may occur in the punching process. In order to avoid this, it is preferable that the maximum temperature reached is 800 ° C. or higher.
- the time for the temperature of the cold-rolled steel sheet to reach 800 ° C. or higher should be 15 seconds or less. preferable.
- the thickness of the non-oriented electrical steel sheet manufactured through the above steps is not particularly limited, but is preferably 0.1 to 1.0 mm, more preferably 0.2 to 0.7 mm. ..
- a non-directional electromagnetic steel plate was produced by sequentially performing a steelmaking process, a hot rolling process, a pickling process, a cold rolling process, and a finishing annealing process.
- the chemical composition of non-oriented electrical steel sheets is shown in Table 1, and the manufacturing conditions for these are shown in Table 2. Each steel sheet was manufactured 5 times under the same conditions.
- a test piece was cut out from a non-oriented electrical steel sheet and electrolyzed with 10% acetylacetone-1% tetramethylammonium chloride / methanol at a current density of 20 mA / cm 2 in an amount of about 0.4 g.
- the solution used for the electrolysis was filtered through a filter having a pore size of 0.2 ⁇ m, and the B content in the extraction residue was measured by using ICP emission spectroscopy for the extraction residue collected on the filter. Then, the value obtained by subtracting the B content in the extraction residue from the B content in the steel is calculated as sol. The content of B was used.
- a test piece was cut out from a non-oriented electrical steel sheet and electrolyzed with 10% acetylacetone-1% tetramethylammonium chloride / methanol at a current density of 20 mA / cm 2 in an amount of about 0.4 g.
- the solution used for the electrolysis was filtered through a filter having a pore size of 0.2 ⁇ m, and the Al content in the extraction residue was measured by using ICP emission spectroscopy for the extraction residue collected on the filter. Then, the Al content in the extraction residue was multiplied by 14/27 to determine the N content in the extraction residue, which was used as the N AlN content.
- the obtained non-oriented electrical steel sheet was subjected to strain-removal annealing by holding it at 750 ° C. for 2 hours.
- the following characteristic evaluations were carried out on the non-oriented electrical steel sheets after strain removal and annealing.
- (B) Magnetic Flux Density After Strain Removal and Annealing The magnetic flux density (B 50 ) of the steel sheet after strain removal and annealing was measured in accordance with JIS C 2552: 2014 “Directional Electromagnetic Steel Band”. It was judged that the non-oriented electrical steel sheet having a B50 of 1.70 T or more of the steel sheet after strain relief annealing was excellent in the magnetic flux density after strain cancellation annealing.
- Table 3 The above evaluation results are shown in Table 3. The characteristic evaluation was carried out using five steel plates. Further, in Table 3, the average value and the maximum value are shown for the iron loss, and the average value and the minimum value are shown for the magnetic flux density.
- the present invention it is possible to stably provide a non-oriented electrical steel sheet having good crystal grain growth after strain relief annealing and good iron loss and magnetic flux density after strain cancellation annealing at low cost. Therefore, the present invention has extremely high industrial applicability.
Abstract
Description
C:0.0010~0.0050%、
Si:1.50%以下、
Mn:0.10~1.50%、
sol.Al:0.010~0.040%、
Ti:0.0030%以下、
Nb:0.0030%以下、
V:0.0030%以下、
Zr:0.0030%以下、
N:0.0030%以下、
S:0.0040%以下、
B:0.0045%以下、
残部:Feおよび不純物であり、
下記(i)~(iv)式を満足する、
無方向性電磁鋼板。
0.0020≦Ti+Nb+V+Zr≦0.0120 ・・・(i)
0.5≦B/N≦1.5 ・・・(ii)
sol.B≦0.0005 ・・・(iii)
NAlN≦0.0005 ・・・(iv)
但し、上記(i)および(ii)式中の元素記号は各元素の含有量(質量%)を表し、上記(iii)式中のsol.Bは固溶B量(質量%)であり、上記(iv)式中のNAlNはAlNとして存在するN量(質量%)である。
Sn:0.50%以下、
を含有する、
上記(1)に記載の無方向性電磁鋼板。
750℃で2時間保持する条件で歪取焼鈍を行った後の平均結晶粒径が50μm以上である、
上記(1)または(2)に記載の無方向性電磁鋼板。
上記(1)または(2)に記載の化学組成を有するスラブを製造する製鋼工程と、
得られた前記スラブを加熱した後に熱間圧延を施し、熱延鋼板とする熱延工程と、
前記熱延鋼板に対して、酸洗を施す酸洗工程と、
酸洗後の前記熱延鋼板に対して冷間圧延を施し、冷延鋼板とする冷延工程と、
前記冷延鋼板に対して仕上焼鈍を施す仕上焼鈍工程と、を備え、
前記熱延工程において、
熱間圧延を施す前に、前記スラブの温度が1000~1050℃となる範囲内で30分以上保持し、
900~1000℃の温度範囲内での累積圧下率を70%以上とし、
熱間圧延を施した後に、前記熱延鋼板の温度が700℃以上780℃未満となる範囲内で30分以上保持する、
無方向性電磁鋼板の製造方法。
上記(4)に記載の無方向性電磁鋼板の製造方法。
化学組成が、質量%で、
C:0.0010~0.0050%、
Si:1.50%以下、
Mn:0.10~1.50%、
sol.Al:0.010~0.040%、
Ti:0.0030%以下、
Nb:0.0030%以下、
V:0.0030%以下、
Zr:0.0030%以下、
N:0.0030%以下、
S:0.0040%以下、
B:0.0045%以下、
残部:Feおよび不純物であり、
下記(i)~(iv)式を満足する、
熱延鋼板。
0.0020≦Ti+Nb+V+Zr≦0.0120 ・・・(i)
0.5≦B/N≦1.5 ・・・(ii)
sol.B≦0.0005 ・・・(iii)
NAlN≦0.0005 ・・・(iv)
但し、上記(i)および(ii)式中の元素記号は各元素の含有量(質量%)を表し、上記(iii)式中のsol.Bは固溶B量(質量%)であり、上記(iv)式中のNAlNはAlNとして存在するN量(質量%)である。
Sn:0.50%以下、
を含有する、
上記(6)に記載の熱延鋼板。
本発明の一実施形態に係る無方向性電磁鋼板および熱延鋼板の化学組成について説明する。各元素の限定理由は下記のとおりである。なお、以下の説明において含有量についての「%」は、「質量%」を意味する。
Cは、固溶Bを炭化物として固定する効果を有する。しかしながら、0.0050%を超える量のCを含有させると、磁気時効によって鉄損を劣化させる。そのため、C含有量は0.0010~0.0050%とする。C含有量は0.0015%以上、0.0020%以上、または0.0025%以上であるのが好ましい。また、C含有量は0.0045%以下、0.0040%以下、または0.0035%以下であるのが好ましい。
Siは、電気抵抗を増加させるために有効な元素である。しかしながら、Si含有量が1.50%を超えると、硬度上昇、磁束密度の低下、および製造コスト増等が生じる。そのため、Si含有量は1.50%以下とする。Si含有量は1.30%以下、1.00%以下、または0.80%以下であるのが好ましい。Si含有量の下限値は0%であるが、上述の効果を得るために、Si含有量は0.10%以上、0.20%以上、または0.50%以上であるのが好ましい。
Mnは、硫化物生成元素であり、結晶粒成長を促進する観点からは適量が含まれることが好ましい。しかしながら、Mn含有量が1.50%を超える場合、変態温度が下がって熱延鋼板の組織制御が困難になり、結晶粒成長を促進することができなくなり、鉄損が劣化する。加えて、飽和磁束密度の低下が著しくなる。そのため、Mn含有量は0.10~1.50%とする。Mn含有量は0.30%以上、0.50%以上、または0.70%以上であるのが好ましい。また、Mn含有量は1.20%以下、1.00%以下、または0.80%以下であるのが好ましい。
Alは、鋼の脱酸に必要な元素である。sol.Al(固溶状態で存在するAl)の含有量が0.010%に満たない場合、安定した脱酸効果が得られず、ノズル詰り等の問題が発生する。一方、需要家におけるスクラップ活用の観点から、Al含有量は少ない方が好ましい。そのため、sol.Al含有量は0.010~0.040%とする。sol.Al含有量は0.015%以上、0.020%以上、または0.025%以上であるのが好ましい。また、sol.Alの含有量は0.035%以下、0.030%以下、または0.028%以下であるのが好ましい。
Tiは、窒化物を生成して粒成長を著しく悪化させる。しかし、Tiは不純物として鋼中に混入する元素であるので、Ti含有量をゼロにすることは工業的には難しい。また、極微量のTiは、AlNの生成を抑制する効果を有する。一方、その含有量が過剰であると結晶粒成長を悪化させる。そのため、Ti含有量は0.0030%以下とする。Ti含有量は0.0025%以下、0.0020%以下、または0.0015%以下であるのが好ましい。一方、上記の効果を得たい場合は、Ti含有量は0.0005%以上、0.0008%以上、0.0010%以上、または0.0012%以上であるのが好ましい。
Nbは、窒化物を生成して粒成長を著しく悪化させる。しかし、Nbは不純物として鋼中に混入する元素であるので、Nb含有量をゼロにすることは工業的には難しい。また、極微量のNbは、AlNの生成を阻害する効果を有する。一方、その含有量が過剰であると結晶粒成長を悪化させる。そのため、Nb含有量は0.0030%以下とする。Nb含有量は0.0025%以下、0.0020%以下、または0.0015%以下であるのが好ましい。一方、上記の効果を得たい場合は、Nb含有量は0.0005%以上、0.0008%以上、0.0010%以上、または0.0012%以上であるのが好ましい。
Vは、窒化物を生成して粒成長を著しく悪化させる。しかし、Vは不純物として鋼中に混入する元素であるので、V含有量をゼロにすることは工業的には難しい。また、極微量のVは、AlNの生成を阻害する効果を有する。一方、その含有量が過剰であると結晶粒成長を悪化させる。そのため、V含有量は0.0030%以下とする。V含有量は0.0025%以下、0.0020%以下、または0.0015%以下であるのが好ましい。一方、上記の効果を得たい場合は、V含有量は0.0005%以上、0.0008%以上、0.0010%以上、または0.0012%以上であるのが好ましい。
Zrは、窒化物を生成して粒成長を著しく悪化させる。しかし、Zrは不純物として鋼中に混入する元素であるので、Zr含有量をゼロにすることは工業的には難しい。また、極微量のZrは、AlNの生成を阻害する効果を有する。一方、その含有量が過剰であると結晶粒成長を悪化させる。そのため、Zr含有量は0.0030%以下とする。Zr含有量は0.0025%以下、0.0020%以下、または0.0015%以下であるのが好ましい。一方、上記の効果を得たい場合は、Zr含有量は0.0005%以上、0.0008%以上、0.0010%以上、または0.0012%以上であるのが好ましい。
0.0020≦Ti+Nb+V+Zr≦0.0120 ・・・(i)
但し、上記(i)式中の元素記号は各元素の含有量(質量%)を表す。
Nは、結晶粒成長に有害な窒化物を生成する。結晶粒成長を悪化させない条件として、N含有量の上限を0.0030%とする。N含有量は0.0025%以下、0.0020%以下、または0.0015%以下であるのが好ましい。なお、N含有量は可能な限り低減することが好ましいが、Nは不純物として鋼中に混入する元素であるので、N含有量をゼロにすることは工業的には難しい。本発明においては、Nがある程度含有されることを前提としたうえで、後述するB含有量との関係式によってN含有量の下限値を規定することとする。一方、N含有量の下限値を別途定めてもよい。例えば、N含有量を0.0008%以上、0.0010%以上、または0.0012%以上としてもよい。なお、N含有量とは、後述するNAlN、およびBNを構成するN等を含む全ての形態のNの含有量を意味する。
Sは、硫化物を形成して粒成長を著しく悪化させる。特に、S含有量が0.0040%を超えると硫化物の析出量が増え、結晶粒成長が阻害される。そのため、S含有量は0.0040%以下とする。S含有量は0.0035%以下、0.0030%以下、または0.0025%以下であるのが好ましい。S含有量の下限値は0%であるが、精錬コストを考慮して、S含有量を0.0008%以上、0.0010%以上、または0.0012%以上としてもよい。
Bは、結晶粒成長に有害なAlNの生成抑制に必須の元素である。そのため、B含有量は0.0045%以下の範囲で、かつ上述のN含有量に応じて定めることとする。具体的には、下記(ii)式を満足するようにB含有量を制御することとする。なお、このB含有量とは、固溶B(sol.B)、およびBN等の析出物を形成するB等を含むあらゆる形態のBの含有量を意味する。B/Nの値を0.5~1.5とすることは、固溶B量の低減およびAlNの生成抑制の両方を達成するための重要な手段の1つである。なお、B/Nの値は0.6以上、0.7以上、または0.8以上であるのが好ましい。また、B/Nは1.4以下、1.3以下、または1.0以下であるのが好ましい。
0.5≦B/N≦1.5 ・・・(ii)
但し、上記(ii)式中の元素記号は各元素の含有量(質量%)を表す。
sol.B≦0.0005 ・・・(iii)
本発明において、Snは必須ではないため、その含有量の下限値は0%である。合金コスト削減の観点からは、Sn含有量は極力低減されることが好ましい。ただし、Snは磁束密度の向上効果を有する。これに加え、Snは、焼鈍中における鋼板表面の窒化および酸化の抑制にも効果がある。また、sol.Al:0.010~0.040%を含有する場合においては、Snは特に窒化されやすい。そのため、必要に応じてSnを含有させても構わない。具体的には、Sn含有量は0.01%以上、0.02%以上、または0.05%以上であるのが好ましい。一方、Sn含有量が多すぎてもその効果が飽和するので、Sn含有量を0.40%以下、0.30%以下、0.20%以下、0.10%以下、0.09%以下、または0.08%以下としてもよい。
AlNを構成するN(以下「NAlN」と記載する)の含有量は、結晶粒成長に影響しない上限として、0.0005%以下とする。すなわち、NAlNの含有量は下記(iv)式を満足する必要がある。
NAlN≦0.0005 ・・・(iv)
本実施形態に係る無方向性電磁鋼板の平均結晶粒径は特に規定されない。無方向性電磁鋼板は、上述のとおり、機械加工および歪取焼鈍を経てから使用されるため、歪取焼鈍の条件に応じて平均結晶粒径が変化する。上述の使用実態を考慮すると、歪取焼鈍における粒成長性が良好である限り、無方向性電磁鋼板の段階で平均結晶粒径を規定することは必須ではない。一方、平均結晶粒径は打ち抜き加工性の向上の観点からは重要な因子である。打ち抜き加工に供される無方向性電磁鋼板では、平均結晶粒径が30μm以下であると打ち抜き加工性が向上する。そのため、仕上焼鈍後の無方向性電磁鋼板の平均結晶粒径は30μm以下としてもよい。平均結晶粒径を30μm以下にするための手段としては、公知の技術を適宜用いることができる。
本実施形態に係る無方向性電磁鋼板の製造方法は、製鋼工程、熱延工程、酸洗工程、冷延工程および仕上焼鈍工程を備える。
製鋼工程において、適宜精錬および鋳造を行うことで、上述した化学組成を有するスラブを製造する。製鋼工程において製造条件は特に限定されず、公知の条件を適宜採用することができる。
熱延工程において、連続鋳造工程によって得られたスラブを加熱した後に熱間圧延を施し、熱延鋼板とする。本工程によって、本発明の一実施形態に係る熱延鋼板が製造される。なお、熱延工程以降の工程が化学組成および酸化物の状態に実質的な影響を与えることはない。そのため、上述のように、熱延鋼板の化学組成および析出物の状態は、本実施形態に係る無方向性電磁鋼板と共通している。
酸洗工程において、熱延工程によって得られた熱延鋼板に対して、酸洗を施す。酸洗条件は特に限定されず、無方向性電磁鋼板の製造条件における通常の範囲内とすればよい。
冷延工程において、酸洗後の熱延鋼板に対して、冷間圧延を施し、冷延鋼板とする。冷間圧延条件は特に限定されず、無方向性電磁鋼板の製造条件における通常の範囲内とすればよい。例えば、冷延工程における圧下率については、50~95%とするのが好ましく、75~85%とするのがより好ましい。
仕上焼鈍工程において、冷延工程によって得られた冷延鋼板に対して仕上焼鈍を施す。仕上焼鈍工程において、条件は特に限定されず、公知の条件を適宜用いることができる。ただし、冷延鋼板の加熱速度を増加させることによって、磁束密度を高めることができるため好ましい。したがって、仕上焼鈍工程における加熱速度を20℃/s以上とすることが好ましい。ここで、加熱速度とは、冷延鋼板の加熱開始温度と均熱温度との差を、加熱開始温度から均熱温度に至るまでの時間で割った値、すなわち加熱開始温度から均熱温度までの平均加熱速度である。
上述の歪取焼鈍後の鋼板の鉄損(W15/50)を、JIS C 2552:2014「無方向性電磁鋼帯」に準拠して測定した。歪取焼鈍後の鋼板のW15/50が5.0W/kg以下である無方向性電磁鋼板を、歪取焼鈍後の鉄損特性に優れたものと判断した。
上述の歪取焼鈍後の鋼板の磁束密度(B50)を、JIS C 2552:2014「無方向性電磁鋼帯」に準拠して測定した。歪取焼鈍後の鋼板のB50が1.70T以上である無方向性電磁鋼板を、歪取焼鈍後の磁束密度に優れたものと判断した。
上述の歪取焼鈍後の鋼板の平均結晶粒径を、上述の無方向性電磁鋼板の平均結晶粒径の測定方法と同じ方法を用いて測定した。歪取焼鈍後の平均結晶粒径が50μm以上である無方向性電磁鋼板は、歪取焼鈍における粒成長性が良好であると判断された。
歪取焼鈍を行う前の、仕上焼鈍後の無方向性電磁鋼板を用いて打ち抜き加工性の評価を行った。具体的には、板厚の7%以上12%以下のクリアランスで、鋼板を打ち抜いた。打ち抜き部におけるカエリ高さを測定した。カエリ高さが30μm以下となった試料に関しては、打ち抜き加工性を「良好」(記号A)と判定した。カエリ高さが30μm超100μm以下となった試料に関しては、打ち抜き加工性を「可」(記号B)と判定した。
Claims (7)
- 化学組成が、質量%で、
C:0.0010~0.0050%、
Si:1.50%以下、
Mn:0.10~1.50%、
sol.Al:0.010~0.040%、
Ti:0.0030%以下、
Nb:0.0030%以下、
V:0.0030%以下、
Zr:0.0030%以下、
N:0.0030%以下、
S:0.0040%以下、
B:0.0045%以下、
残部:Feおよび不純物であり、
下記(i)~(iv)式を満足する、
無方向性電磁鋼板。
0.0020≦Ti+Nb+V+Zr≦0.0120 ・・・(i)
0.5≦B/N≦1.5 ・・・(ii)
sol.B≦0.0005 ・・・(iii)
NAlN≦0.0005 ・・・(iv)
但し、上記(i)および(ii)式中の元素記号は各元素の含有量(質量%)を表し、上記(iii)式中のsol.Bは固溶B量(質量%)であり、上記(iv)式中のNAlNはAlNとして存在するN量(質量%)である。 - 前記化学組成が、前記Feの一部に代えて、質量%で、
Sn:0.50%以下、
を含有する、
請求項1に記載の無方向性電磁鋼板。 - 平均結晶粒径が30μm以下であり、かつ、
750℃で2時間保持する条件で歪取焼鈍を行った後の平均結晶粒径が50μm以上である、
請求項1または請求項2に記載の無方向性電磁鋼板。 - 請求項1から請求項3までのいずれか一項に記載の無方向性電磁鋼板を製造する方法であって、
請求項1または請求項2に記載の化学組成を有するスラブを製造する製鋼工程と、
得られた前記スラブを加熱した後に熱間圧延を施し、熱延鋼板とする熱延工程と、
前記熱延鋼板に対して、酸洗を施す酸洗工程と、
酸洗後の前記熱延鋼板に対して冷間圧延を施し、冷延鋼板とする冷延工程と、
前記冷延鋼板に対して仕上焼鈍を施す仕上焼鈍工程と、を備え、
前記熱延工程において、
熱間圧延を施す前に、前記スラブの温度が1000~1050℃となる範囲内で30分以上保持し、
900~1000℃の温度範囲内での累積圧下率を70%以上とし、
熱間圧延を施した後に、前記熱延鋼板の温度が700℃以上780℃未満となる範囲内で30分以上保持する、
無方向性電磁鋼板の製造方法。 - 前記仕上焼鈍工程において、20℃/s以上の平均加熱速度で800℃以上850℃未満の最高到達温度まで加熱し、かつ前記冷延鋼板の温度が800℃以上となる時間を15秒以下とする、
請求項4に記載の無方向性電磁鋼板の製造方法。 - 請求項1から請求項3までのいずれか一項に記載の無方向性電磁鋼板の素材となる熱延鋼板であって、
化学組成が、質量%で、
C:0.0010~0.0050%、
Si:1.50%以下、
Mn:0.10~1.50%、
sol.Al:0.010~0.040%、
Ti:0.0030%以下、
Nb:0.0030%以下、
V:0.0030%以下、
Zr:0.0030%以下、
N:0.0030%以下、
S:0.0040%以下、
B:0.0045%以下、
残部:Feおよび不純物であり、
下記(i)~(iv)式を満足する、
熱延鋼板。
0.0020≦Ti+Nb+V+Zr≦0.0120 ・・・(i)
0.5≦B/N≦1.5 ・・・(ii)
sol.B≦0.0005 ・・・(iii)
NAlN≦0.0005 ・・・(iv)
但し、上記(i)および(ii)式中の元素記号は各元素の含有量(質量%)を表し、上記(iii)式中のsol.Bは固溶B量(質量%)であり、上記(iv)式中のNAlNはAlNとして存在するN量(質量%)である。 - 前記化学組成が、前記Feの一部に代えて、質量%で、
Sn:0.50%以下、
を含有する、
請求項6に記載の熱延鋼板。
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- 2020-11-27 JP JP2022564928A patent/JPWO2022113264A1/ja active Pending
- 2020-11-27 CN CN202080107537.1A patent/CN116547394A/zh active Pending
- 2020-11-27 EP EP20963528.3A patent/EP4253575A4/en active Pending
- 2020-11-27 KR KR1020237021158A patent/KR20230110338A/ko unknown
- 2020-11-27 WO PCT/JP2020/044203 patent/WO2022113264A1/ja active Application Filing
- 2020-11-27 US US18/033,123 patent/US20230392227A1/en active Pending
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CN116547394A (zh) | 2023-08-04 |
US20230392227A1 (en) | 2023-12-07 |
EP4253575A4 (en) | 2023-12-20 |
JPWO2022113264A1 (ja) | 2022-06-02 |
EP4253575A1 (en) | 2023-10-04 |
KR20230110338A (ko) | 2023-07-21 |
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