WO2014129034A1 - 磁気特性に優れるセミプロセス無方向性電磁鋼板の製造方法 - Google Patents
磁気特性に優れるセミプロセス無方向性電磁鋼板の製造方法 Download PDFInfo
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- WO2014129034A1 WO2014129034A1 PCT/JP2013/081384 JP2013081384W WO2014129034A1 WO 2014129034 A1 WO2014129034 A1 WO 2014129034A1 JP 2013081384 W JP2013081384 W JP 2013081384W WO 2014129034 A1 WO2014129034 A1 WO 2014129034A1
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 30
- 239000010959 steel Substances 0.000 title claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 230000001747 exhibiting effect Effects 0.000 title 1
- 238000000137 annealing Methods 0.000 claims abstract description 51
- 238000001953 recrystallisation Methods 0.000 claims abstract description 20
- 239000000203 mixture Substances 0.000 claims abstract description 12
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 229910000565 Non-oriented electrical steel Inorganic materials 0.000 claims description 22
- 238000010438 heat treatment Methods 0.000 claims description 15
- 229910052698 phosphorus Inorganic materials 0.000 claims description 4
- 229910052717 sulfur Inorganic materials 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 36
- 229910052742 iron Inorganic materials 0.000 abstract description 16
- 230000004907 flux Effects 0.000 abstract description 13
- 238000005097 cold rolling Methods 0.000 abstract description 9
- 238000005098 hot rolling Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 17
- 238000002791 soaking Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- 239000013078 crystal Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000002244 precipitate Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 229910001224 Grain-oriented electrical steel Inorganic materials 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000011162 core material Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 238000009849 vacuum degassing Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/147—Alloys characterised by their composition
- H01F1/14766—Fe-Si based alloys
- H01F1/14775—Fe-Si based alloys in the form of sheets
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- C—CHEMISTRY; METALLURGY
- 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
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
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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
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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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
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- 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
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/16—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of sheets
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
Definitions
- the present invention relates to a method for manufacturing a semi-processed non-oriented electrical steel sheet, and specifically to a method for manufacturing a semi-processed non-oriented electrical steel sheet having excellent magnetic properties.
- Non-oriented electrical steel sheets are widely used as core materials for electrical equipment.
- high magnetic flux density and low iron loss of non-oriented electrical steel sheets are indispensable. is there.
- the non-oriented electrical steel sheet mainly by adding elements that increase the specific resistance such as Si and Al, or by reducing the plate thickness, the reduction of iron loss,
- efforts have been made to increase the magnetic flux density by increasing the grain size before cold rolling and optimizing the cold rolling reduction ratio.
- a full-process material that is used without being annealed after being punched into a predetermined iron core shape and a semi-process material that is used after being subjected to stress relief annealing after punching to improve magnetic properties.
- the latter semi-process material can obtain good iron loss characteristics by reducing the crystal grains before punching and coarsening the crystal grains by subsequent strain relief annealing.
- Patent Document 1 contains 0.75 to 1.5 mass% of Mn, coexists with a large amount of C with respect to the Mn, and cold rolling under the coexistence of Mn and C. It is disclosed that a semi-process material having excellent magnetic properties after strain relief annealing can be obtained by performing subsequent annealing and setting the C content to 0.005% or less.
- the present invention has been made in view of the above-mentioned problems of the prior art, and its purpose is to provide a semi-processed non-oriented electrical steel sheet having high magnetic flux density and low iron loss at low cost after strain relief annealing. It is in.
- the inventors have intensively studied to solve the above problems. As a result, Se contained as impurities is reduced as much as possible, and the heating rate in recrystallization annealing after cold rolling is heated more rapidly than before, so that the magnetic flux density and iron loss characteristics after strain relief annealing are remarkably excellent.
- the inventors have found that a grain-oriented electrical steel sheet can be obtained, and have developed the present invention.
- the present invention is C: 0.005 mass% or less, Si: 4 mass% or less, Mn: 0.03 to 2 mass%, P: 0.2 mass% or less, S: 0.004 mass% or less, Al: 2 mass% or less , N: 0.004 mass% or less and Se: 0.0010 mass% or less, the steel slab having a composition composed of Fe and unavoidable impurities in the balance is hot-rolled, cold-rolled, and then subjected to recrystallization annealing.
- the semi-processed non-oriented electrical steel sheet is heated by setting the average temperature rising rate up to 740 ° C. in the recrystallization annealing as 100 ° C./s or more. .
- the steel slab used in the present invention is characterized by further containing 0.003 to 0.5 mass% of one or two selected from Sn and Sb in addition to the above component composition.
- the steel slab used in the present invention is characterized by further containing 0.0010 to 0.005 mass% of Ca in addition to the above component composition.
- the non-oriented electrical steel sheet which has the outstanding magnetic characteristic which contributes to high efficiency of electrical equipment, such as a rotary machine and a small transformer, can be provided at low cost, without adding a special element. .
- the steel sheet was heated by varying the average rate of temperature increase up to 740 ° C. in the range of 30 to 300 ° C./s, held at 740 ° C. for 10 seconds, and then cooled to form a cold-rolled annealed plate.
- the magnetic properties can be greatly improved by setting the average temperature elevation rate in the recrystallization annealing to 100 ° C./s or more. This is because, by increasing the rate of temperature increase during recrystallization annealing, recrystallization of ⁇ 111 ⁇ grains is suppressed, and recrystallization of ⁇ 110 ⁇ grains and ⁇ 100 ⁇ grains is promoted. , ⁇ 110 ⁇ grains and ⁇ 100 ⁇ grains phagocytose ⁇ 111 ⁇ grains and preferentially grow grains, which is considered to improve the magnetic properties.
- C: 0.0021 mass%, Si: 1.8 mass%, Mn: 0.50 mass%, P: 0.03 mass%, S: 0.0019 mass%, Al: 0.3 mass% and N: 0.0025 mass% are the basic components, and Se is added to Tr.
- Steel added with various changes in a range of up to 0.0050 mass% was melted in a laboratory, made into a steel ingot, and then hot-rolled to form a hot-rolled sheet having a thickness of 2.0 mm.
- the magnetic properties are improved by reducing the Se content to 0.0010 mass% or less, in other words, when Se is added in excess of 0.0010 mass%, MnSe precipitates at the grain boundaries, It became clear that the grain growth at the time of strain relief annealing was inhibited and the magnetic properties were deteriorated.
- the present invention has been made on the basis of the above novel findings.
- C 0.005 mass% or less If C is contained in the product steel plate in an amount exceeding 0.005 mass%, magnetic aging is caused to deteriorate the iron loss characteristics, so the upper limit is made 0.005 mass%. Preferably it is 0.003 mass% or less.
- Si 4 mass% or less Si is an element effective for increasing the specific resistance of steel and reducing iron loss. In order to obtain such an effect, addition of 1 mass% or more is preferable. On the other hand, if added over 4 mass%, the magnetic flux density is lowered or it is difficult to roll and manufacture, so the upper limit is made 4 mass%.
- the range is preferably 1 to 4 mass%, more preferably 1.5 to 3 mass%.
- Mn 0.03 to 2 mass%
- Mn is an element effective for improving the hot workability, but if it is less than 0.03 mass%, a sufficient effect cannot be obtained. On the other hand, addition of more than 2 mass% leads to an increase in raw material cost.
- the range is 0.03 to 2 mass%.
- the range is preferably 0.05 to 2 mass%, more preferably 0.1 to 1.6 mass%.
- P 0.2 mass% or less P is an element effective for increasing the specific resistance of steel and reducing iron loss. However, addition of 0.2 mass% or more hardens the steel and lowers the rollability. Therefore, the upper limit is set to 0.2 mass%. Preferably, it is in the range of 0.01 to 0.1 mass%.
- S 0.004 mass% or less
- S is an impurity element that is inevitably mixed in. If it exceeds 0.004 mass%, it forms a sulfide-based precipitate and inhibits grain growth during strain relief annealing. However, since the magnetic properties are deteriorated, the upper limit is set to 0.004 mass% in the present invention. Preferably it is 0.003 mass% or less.
- Al 2 mass% or less
- Al, like Si, is an element effective for increasing the specific resistance of steel and reducing iron loss. However, if it is added in excess of 2 mass%, it becomes difficult to produce by rolling. Therefore, the upper limit is 2 mass%.
- the lower limit is not particularly limited, and may be 0 mass%. The range is preferably 0.001 to 2 mass%, more preferably 0.1 to 1 mass%.
- N 0.004 mass% or less
- N is an impurity element that is inevitably mixed.
- the upper limit is set to 0.004 mass%. Preferably it is 0.003 mass% or less.
- Se 0.0010 mass% or less
- Se is a harmful element that degrades the magnetic properties after strain relief annealing, as can be seen from the experimental results described above. Therefore, in the present invention, Se is limited to 0.0010 mass% or less. Preferably it is 0.0005 mass% or less.
- the non-oriented electrical steel sheet of the present invention can appropriately contain the following components in addition to the essential components.
- Sn, Sb 0.003 to 0.5 mass% each Sn and Sb not only improve the texture and improve the magnetic flux density, but also prevent the deterioration of the magnetic properties by suppressing the oxidation and nitridation of the steel sheet surface layer and the generation of the surface layer fine grains associated therewith. It is an element that has an effect. In order to obtain such an effect, it is preferable to add 0.003 mass% or more of one or two of Sn and Sb. On the other hand, if added over 0.5 mass%, on the contrary, the growth of crystal grains is hindered and there is a possibility that the magnetic properties are lowered. Therefore, Sn and Sb are preferably added in the range of 0.003 to 0.5 mass%, respectively.
- Ca 0.0010 to 0.005 mass% Ca is compounded with the Se compound to form coarse precipitates, and therefore has an effect of promoting grain growth during strain relief annealing and improving magnetic properties. In order to exhibit such an effect, it is preferable to add 0.0010 mass% or more. On the other hand, if added over 0.005 mass%, the amount of precipitated CaS increases and the iron loss increases on the contrary, so the upper limit is preferably made 0.005 mass%.
- the balance other than the above components is Fe and inevitable impurities. However, as long as the effects of the present invention are not impaired, the inclusion of other elements is not rejected.
- the method for producing a non-oriented electrical steel sheet according to the present invention first involves melting a steel having the above-mentioned composition suitable for the present invention in a normal refining process using a converter, an electric furnace, a vacuum degassing apparatus, etc. Steel slabs are produced by continuous casting or ingot-bundling.
- the steel slab is hot-rolled by a normal method to form a hot-rolled sheet, and then subjected to hot-rolled sheet annealing as necessary.
- this hot-rolled sheet annealing is not an essential step in the present invention, it is preferably employed as appropriate because it is effective in improving magnetic properties.
- the annealing temperature is preferably in the range of 750 to 1050 ° C. If the annealing temperature is less than 750 ° C., an unrecrystallized structure may remain and the effect of hot-rolled sheet annealing may not be obtained. On the other hand, if it exceeds 1050 ° C., a great load is applied to the annealing equipment. More preferably, it is in the range of 800 to 1000 ° C.
- the steel sheet subjected to hot-rolled sheet annealing is then pickled and then cold-rolled twice or more times with one or more cold-rolling and intermediate annealing. It is a cold-rolled sheet with the final thickness.
- the rolling conditions such as the rolling reduction at this time may be the same as the manufacturing conditions for a normal non-oriented electrical steel sheet.
- the heating condition is rapid heating up to the recrystallization temperature range.
- the average temperature increase rate from room temperature to 740 ° C is set to 100 ° C. It is necessary to carry out rapid heating to at least / s.
- the end point temperature for rapid heating may be at least 740 ° C., which is the temperature at which recrystallization is completed, or may be a temperature exceeding 740 ° C.
- the higher the end point temperature the higher the equipment cost and power cost required for heating.
- the rate of temperature increase from the recrystallization temperature to the soaking temperature, the soaking temperature, and the soaking time may be performed in accordance with the conditions used in ordinary non-oriented electrical steel sheets, but are not particularly limited.
- the rate of temperature increase from 740 ° C. to the soaking temperature is preferably 1 to 50 ° C./s
- the soaking temperature is preferably 740 to 950 ° C.
- the soaking time is preferably 5 to 60 seconds.
- a more preferable soaking temperature is in the range of 740 to 900 ° C.
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Abstract
Description
歪取焼鈍後の磁気特性に及ぼす再結晶焼鈍における昇温速度の影響について調査するため、C:0.0025mass%、Si:2.0mass%、Mn:0.10mass%、P:0.01mass%、Al:0.001mass%、N:0.0019mass%、S:0.0020mass%およびSe:0.0002mass%を含有する鋼スラブを1100℃×30分の再加熱後、熱間圧延して板厚2.0mmの熱延板とし、980℃×30秒の熱延板焼鈍を施した後、1回の冷間圧延で板厚0.35mmの冷延板とし、その後、直接通電加熱炉で、740℃までの平均昇温速度を30~300℃/sの範囲で種々に変化させて加熱し、740℃で10秒間保持した後、冷却して冷延焼鈍板とした。
C:0.005mass%以下
Cは、製品鋼板中に0.005mass%を超えて含有していると、磁気時効を起こして鉄損特性を劣化させるので、上限は0.005mass%とする。好ましくは0.003mass%以下である。
Siは、鋼の固有抵抗を高め、鉄損を低減するのに有効な元素であり、斯かる効果を得るためには1mass%以上の添加が好ましい。一方、4mass%を超えて添加すると、磁束密度が低下したり、圧延して製造することを困難としたりするので、上限は4mass%とする。好ましくは1~4mass%、より好ましくは1.5~3mass%の範囲である。
Mnは、熱間加工性を改善するのに有効な元素であるが、0.03mass%未満では十分な効果が得られず、一方、2mass%を超える添加は、原料コストの上昇を招くので、0.03~2mass%の範囲とする。好ましくは0.05~2mass%、より好ましくは0.1~1.6mass%の範囲である。
Pは、鋼の固有抵抗を高め、鉄損を低減するのに有効な元素であるが、0.2mass%以上の添加は、鋼を硬質化し、圧延性を低下させるため、上限は0.2mass%とする。好ましくは0.01~0.1mass%の範囲である。
Sは、不可避的に混入してくる不純物元素であり、0.004mass%を超えて含有すると、硫化物系析出物を形成して歪取焼鈍時の粒成長を阻害し、磁気特性を劣化させるので、本発明においては、上限を0.004mass%とする。好ましくは0.003mass%以下である。
Alは、Siと同様、鋼の固有抵抗を高め、鉄損を低減するのに有効な元素であるが、2mass%を超えて添加すると、圧延して製造することが難しくなるので、上限は2mass%とする。下限値は、特に制限はなく、0mass%であってもよい。好ましくは0.001~2mass%、より好ましくは0.1~1mass%の範囲である。
Nは、不可避的に混入してくる不純物元素であり、0.004mass%を超えて含有すると、窒化物系析出物を形成し、歪取焼鈍時の粒成長を阻害して磁気特性を劣化させるので、本発明においては、上限を0.004mass%とする。好ましくは0.003mass%以下である。
Seは、上述した実験結果からわかるように、歪取焼鈍後の磁気特性を劣化させる有害な元素である。そこで、本発明においては、Seを0.0010mass%以下に制限する。好ましくは0.0005mass%以下である。
Sn,Sb:それぞれ0.003~0.5mass%
SnおよびSbは、集合組織を改善して磁束密度を向上させるだけでなく、鋼板表層の酸化や窒化、それに伴う表層微細粒の生成を抑制することによって、磁気特性の劣化を防止する等の作用効果を有する元素である。斯かる効果を得るためには、SnおよびSbのうちの1種または2種を0.003mass%以上添加するのが好ましい。一方、0.5mass%を超えて添加すると、逆に、結晶粒の成長が阻害され、磁気特性の低下を招くおそれがある。よって、SnおよびSbは、それぞれ0.003~0.5mass%の範囲で添加するのが好ましい。
Caは、Se化合物と複合化して粗大な析出物を形成するため、歪取焼鈍時の粒成長を促進し、磁気特性を改善する効果がある。このような効果を発現させるためには、0.0010mass%以上添加するのが好ましい。一方、0.005mass%を超えて添加すると、CaSの析出量が多くなり、却って鉄損が上昇するため、上限は0.005mass%とするのが好ましい。
本発明の無方向性電磁鋼板の製造方法は、先ず、本発明に適合する上記成分組成を有する鋼を転炉や電気炉、真空脱ガス装置などを用いた通常の精錬プロセスで溶製し、連続鋳造法あるいは造塊-分塊圧延法で鋼スラブとする。
Claims (3)
- C:0.005mass%以下、Si:4mass%以下、Mn:0.03~2mass%、P:0.2mass%以下、S:0.004mass%以下、Al:2mass%以下、N:0.004mass%以下およびSe:0.0010mass%以下を含有し、残部がFeおよび不可避的不純物からなる成分組成の鋼スラブを熱間圧延し、冷間圧延した後、再結晶焼鈍を施す無方向性電磁鋼板の製造方法において、上記再結晶焼鈍における740℃までの平均昇温速度を100℃/s以上として加熱することを特徴とするセミプロセス無方向性電磁鋼板の製造方法。
- 上記成分組成に加えてさらに、SnおよびSbのうちから選ばれる1種または2種をそれぞれ0.003~0.5mass%含有することを特徴とする請求項1に記載のセミプロセス無方向性電磁鋼板の製造方法。
- 上記成分組成に加えてさらに、Caを0.0010~0.005mass%含有することを特徴とする請求項1または2に記載のセミプロセス無方向性電磁鋼板の製造方法。
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WO2017086036A1 (ja) * | 2015-11-20 | 2017-05-26 | Jfeスチール株式会社 | 無方向性電磁鋼板の製造方法 |
JP2017101315A (ja) * | 2015-11-20 | 2017-06-08 | Jfeスチール株式会社 | 無方向性電磁鋼板の製造方法 |
EP3378959A4 (en) * | 2015-11-20 | 2018-11-07 | JFE Steel Corporation | Process for producing non-oriented electromagnetic steel sheet |
US11225699B2 (en) | 2015-11-20 | 2022-01-18 | Jfe Steel Corporation | Method for producing non-oriented electrical steel sheet |
JP2018145492A (ja) * | 2017-03-07 | 2018-09-20 | 新日鐵住金株式会社 | 無方向性電磁鋼板およびその製造方法、並びにモータコアおよびその製造方法 |
WO2019182022A1 (ja) | 2018-03-23 | 2019-09-26 | 日本製鉄株式会社 | 無方向性電磁鋼板 |
KR20200116990A (ko) | 2018-03-23 | 2020-10-13 | 닛폰세이테츠 가부시키가이샤 | 무방향성 전자 강판 |
US11421297B2 (en) | 2018-03-23 | 2022-08-23 | Nippon Steel Corporation | Non-oriented electrical steel sheet |
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JPWO2014129034A1 (ja) | 2017-02-02 |
CN104937118A (zh) | 2015-09-23 |
EP2960345A1 (en) | 2015-12-30 |
TW201435090A (zh) | 2014-09-16 |
EP2960345A4 (en) | 2016-06-08 |
KR20150093807A (ko) | 2015-08-18 |
US9978488B2 (en) | 2018-05-22 |
US20150357101A1 (en) | 2015-12-10 |
JP6008157B2 (ja) | 2016-10-19 |
EP2960345B1 (en) | 2020-01-01 |
RU2617304C2 (ru) | 2017-04-24 |
RU2015139800A (ru) | 2017-03-27 |
TWI555853B (zh) | 2016-11-01 |
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