WO2023277169A1 - 方向性電磁鋼板の製造方法及び方向性電磁鋼板製造用圧延設備 - Google Patents
方向性電磁鋼板の製造方法及び方向性電磁鋼板製造用圧延設備 Download PDFInfo
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- WO2023277169A1 WO2023277169A1 PCT/JP2022/026421 JP2022026421W WO2023277169A1 WO 2023277169 A1 WO2023277169 A1 WO 2023277169A1 JP 2022026421 W JP2022026421 W JP 2022026421W WO 2023277169 A1 WO2023277169 A1 WO 2023277169A1
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 92
- 239000010959 steel Substances 0.000 title claims abstract description 92
- 238000005096 rolling process Methods 0.000 title claims abstract description 84
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000000137 annealing Methods 0.000 claims abstract description 65
- 238000005097 cold rolling Methods 0.000 claims abstract description 60
- 238000001953 recrystallisation Methods 0.000 claims abstract description 26
- 239000000463 material Substances 0.000 claims abstract description 18
- 238000005261 decarburization Methods 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims description 50
- 229910001224 Grain-oriented electrical steel Inorganic materials 0.000 claims description 30
- 238000001816 cooling Methods 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 13
- 239000012535 impurity Substances 0.000 claims description 9
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- 229910052717 sulfur Inorganic materials 0.000 claims description 7
- 229910052797 bismuth Inorganic materials 0.000 claims description 6
- 229910052711 selenium Inorganic materials 0.000 claims description 6
- 238000011049 filling Methods 0.000 claims description 2
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 78
- 229910052742 iron Inorganic materials 0.000 abstract description 35
- 230000000694 effects Effects 0.000 description 12
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- 230000032683 aging Effects 0.000 description 8
- 238000005259 measurement Methods 0.000 description 8
- 229910052748 manganese Inorganic materials 0.000 description 7
- 229910052710 silicon Inorganic materials 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 6
- 239000008119 colloidal silica Substances 0.000 description 6
- 239000011162 core material Substances 0.000 description 6
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- 238000005520 cutting process Methods 0.000 description 5
- 230000001965 increasing effect Effects 0.000 description 5
- 150000001247 metal acetylides Chemical class 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 229910052796 boron Inorganic materials 0.000 description 4
- 229910052804 chromium Inorganic materials 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 238000005098 hot rolling Methods 0.000 description 4
- 239000003112 inhibitor Substances 0.000 description 4
- 230000002401 inhibitory effect Effects 0.000 description 4
- 229910052750 molybdenum Inorganic materials 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- 229910052758 niobium Inorganic materials 0.000 description 4
- 229910052698 phosphorus Inorganic materials 0.000 description 4
- 229910052718 tin Inorganic materials 0.000 description 4
- 229910052787 antimony Inorganic materials 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- -1 Sb: 0.005 to 0.500% Substances 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
- C21D8/1255—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest with diffusion of elements, e.g. decarburising, nitriding
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
- C21D1/667—Quenching devices for spray quenching
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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
- C21D3/00—Diffusion processes for extraction of non-metals; Furnaces therefor
- C21D3/02—Extraction of non-metals
- C21D3/04—Decarburising
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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
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- 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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- C22C—ALLOYS
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- 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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- 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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- 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
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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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
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- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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- 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
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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
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0233—Manufacturing of magnetic circuits made from 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
- C21D2201/00—Treatment for obtaining particular effects
- C21D2201/05—Grain orientation
Definitions
- the present invention relates to a method for manufacturing grain-oriented electrical steel sheets and rolling equipment for manufacturing grain-oriented electrical steel sheets used in this method.
- a grain-oriented electrical steel sheet is a soft magnetic material used as the iron core material of transformers and generators. It is a steel sheet having a crystal structure and excellent magnetic properties.
- Patent Document 1 discloses a method of heat-treating a cold-rolled sheet during cold rolling at a low temperature and subjecting it to aging treatment.
- the cooling rate during hot-rolled sheet annealing or intermediate annealing before final cold rolling is set to 30 ° C./s or more, and further, during final cold rolling, the temperature is 150 to 300 ° C.
- a technique is disclosed in which the inter-pass aging for a minute or more is performed twice or more.
- Patent Document 3 discloses a technique that utilizes dynamic strain aging, in which the temperature of the steel sheet during rolling is increased and warm rolling is performed, so that dislocations introduced during rolling are immediately fixed with C or N. .
- Patent Document 4 discloses that fine carbides are precipitated in the steel in the annealing process immediately before the final cold rolling of the cold rolling process, and this final rolling is divided into the first half and the second half, the first half at a low temperature of 140 ° C or less with a reduction rate of 30 to 75%, and the second half at a high temperature of 150 to 300 ° C with at least two reduction passes. Also, a technique is disclosed in which rolling is performed at a total rolling reduction of 80 to 95% for the first and second halves combined, thereby stably obtaining a highly concentrated material in the Goss orientation.
- Patent Document 5 discloses that fine grains in steel are subjected to heat treatment at 50 to 150° C. for 30 seconds to 30 minutes under the application of a tension of 0.5 kg/mm 2 or more before cold rolling performed by tandem rolling. Techniques for depositing carbides are disclosed.
- the tandem rolling mill has a larger throughput per hour than a reverse mill such as the Zenzimer mill, and is advantageous for mass production of grain-oriented electrical steel sheets.
- the techniques for applying interpass aging during rolling disclosed in Patent Documents 1 and 2 do not produce the desired effects when the distance between each pass is short and the line speed is high, such as in tandem rolling. I can't name it.
- the effect of improving iron loss was insufficient. The reason is described below. Primary recrystallized Goss-oriented grains are believed to nucleate from shear bands introduced into the ⁇ 111 ⁇ 112> matrix structure, which is one of the rolling stable orientations.
- an object of the present invention is to solve the problems of the prior art described above, and to provide a grain-oriented electromagnetic steel sheet capable of stably producing a low-iron-loss grain-oriented electrical steel sheet with little variation in iron-loss by a tandem rolling mill.
- An object of the present invention is to provide a steel plate manufacturing method and rolling equipment used in this method.
- a steel slab containing 85 ppm of Al with the balance being Fe and unavoidable impurities was heated to 1210° C. and then hot-rolled into a hot-rolled sheet having a thickness of 2.0 mm.
- the hot-rolled sheet was subjected to hot-rolled sheet annealing at 1000° C. for 60 seconds, then cooled from 800° C. to 350° C. at 20° C./s, and wound into a coil.
- the obtained hot-rolled and annealed sheet was tandem-rolled once using a tandem rolling mill (roll diameter: 300 mm, number of stands: 5) to form a cold-rolled sheet with a thickness of 0.20 mm.
- the hot-rolled annealed sheets were heated to various temperatures from 50° C. to 250° C. as shown in Table 1 by a heating device installed between the payoff reel of the rolling mill and the first-pass rolling stand.
- the roll speed was adjusted so that the strain rate in the first pass of the tandem was 25 s -1 , and the steel plate was bitten into the rolling stand of the first pass at the same temperature, and the steel plate temperature was changed to room temperature (25 ° C. ), and then two types of coils were produced.
- a coil was also produced in which the steel plate was bitten in the first pass at room temperature without being heated.
- the cold-rolled sheet was subjected to primary recrystallization annealing, which also serves as decarburization annealing, at a soaking temperature of 840° C. for a soaking time of 100 seconds, and then an annealing separator containing MgO as a main component was applied to the surface of the steel sheet. Then, finish annealing was performed to effect secondary recrystallization.
- a coating liquid containing phosphate-chromate-colloidal silica in a mass ratio of 3:1:2 is applied to the surface of the steel sheet after the finish annealing, and flattened at 800 ° C. for 30 seconds to obtain a product coil.
- the iron loss of 10 coils manufactured under the same conditions was measured, and their average value and standard deviation were obtained.
- the iron loss was measured by cutting out a sample from the longitudinal center of the coil so that the total weight was 500 g or more, and performing the Epstein test.
- Table 1 shows the measurement results of the core loss together with the above-described heating temperature and first-pass biting temperature.
- the mechanism by which the iron loss was reduced and the variation in iron loss was improved in the above experiment is not clear, the inventors believe as follows.
- the mechanism by which the variation in iron loss is improved is that the steel sheet is heated from the pay-off reel during cold rolling until it bites into the first pass. This is probably because the time became constant, and the change over time of the fine carbide precipitated by heating could be suppressed.
- the mechanism by which the iron loss is reduced when the temperature of the steel sheet is lowered before it is bitten in the first pass after heating is considered as follows. It is believed that primary recrystallized Goss-oriented grains are nucleated from shear bands introduced into the ⁇ 111 ⁇ 112> matrix structure, which is one of the rolling stable orientations.
- the inventors also investigated the relationship between the biting temperature in the first pass of the final cold rolling and the strain rate in the first pass. Details of the experiment are described below. That is, the hot-rolled sheet prepared in the above experiment was subjected to hot-rolled sheet annealing at 1000° C. for 60 seconds, then cooled from 800° C. to 350° C. at 20° C./s, and then coiled. The obtained hot-rolled and annealed sheet was tandem-rolled once using a tandem rolling mill (roll diameter: 300 mm, number of stands: 5) to form a cold-rolled sheet with a thickness of 0.20 mm. At that time, the steel sheet was heated to 100° C.
- the biting temperature was variously changed from 20° C. to 180° C., and the strain rate in the tandem first pass was changed from 0 to 50 s ⁇ 1 .
- a coil was also produced in which the steel plate was bitten in the first pass at room temperature without being heated.
- the cold-rolled sheet was subjected to primary recrystallization annealing, which also serves as decarburization annealing, at a soaking temperature of 840° C. for a soaking time of 100 seconds, and then an annealing separator containing MgO as a main component was applied to the surface of the steel sheet. Then, finish annealing was performed to effect secondary recrystallization.
- a coating liquid containing phosphate-chromate-colloidal silica in a mass ratio of 3:1:2 is applied to the surface of the steel sheet after the finish annealing, and flattened at 800 ° C. for 30 seconds to obtain a product coil.
- FIG. 1 shows the measurement results of the iron loss arranged in relation to the biting temperature T (° C.) and the strain rate e (s ⁇ 1 ). It should be noted that the iron loss average value of 0.9 W/kg or less and the standard deviation of 0.05 W/kg or less is indicated by "O", and other cases are indicated by "x".
- the strain rate e (s ⁇ 1 ) and the biting temperature T (° C.) in the first pass are as follows: 0.0378e 2 +0.367e + 37.2>T
- the iron loss was low and the variation of the iron loss for each coil was small. Further studies were conducted based on these findings, and the present invention was completed.
- the gist of the present invention is as follows. [1] A steel material is hot-rolled into a hot-rolled steel sheet, the hot-rolled steel sheet is cold-rolled once or twice or more with intermediate annealing to obtain a cold-rolled sheet having a final thickness, and then the above-mentioned A method for producing a grain-oriented electrical steel sheet, comprising subjecting a cold-rolled sheet to decarburization annealing and then subjecting it to secondary recrystallization annealing, Of the 1 or 2 or more cold rollings, when the cold rolling is defined as the final cold rolling in the case of the 1 time and the final cold rolling in the case of the 2 or more times, In the final cold rolling, the steel sheet is heated to a temperature range of 70 ° C.
- a method for producing a grain-oriented electrical steel sheet wherein the filling temperature T (° C.) and the strain rate e (s ⁇ 1 ) satisfy the following equation (1). 0.0378e 2 +0.367e+37.2>T (1)
- the steel material further contains, in % by mass, Sb: 0.005 to 0.500%, Cu: 0.01 to 1.50%, P: 0.005 to 0.500%, Cr: 0.01 to 1.50%, Ni: 0.005 to 1.500%, Sn: 0.01 to 0.50%, Nb: 0.0005 to 0.0100%, Mo: 0.01-0.50%, B: 0.0010 to 0.0070% and Bi: 0.0005 to 0.0500%
- a tandem rolling mill arranged on a production line for grain-oriented electrical steel sheets, and a heating device and a cooling device arranged in order from the upstream side of the production line on the entry side of the first stand of the tandem rolling mill. rolling equipment for manufacturing grain-oriented electrical steel sheets.
- the heating device has a function of injecting a high-temperature liquid onto the steel plate on the production line
- the cooling device has a function of injecting a low-temperature liquid onto the steel plate on the production line
- grain-oriented electrical steel sheets with excellent magnetic properties and little variation in core loss between coils can be stably manufactured using a tandem rolling mill.
- 4 is a graph showing results of iron loss measurement results sorted in relation to biting temperature T (° C.) and strain rate e (s ⁇ 1 ). 4 is a graph showing results of iron loss measurement results sorted in relation to biting temperature T (° C.) and strain rate e (s ⁇ 1 ).
- Step material> In addition to slabs, blooms and billets can be used as the steel material in the manufacturing method of the present invention.
- steel slabs manufactured by known manufacturing methods can be used. Examples of methods for producing steel materials include steelmaking-continuous casting, ingot casting-slabbing rolling, and the like. In steelmaking, molten steel obtained in a converter, an electric furnace, or the like can be subjected to secondary refining such as vacuum degassing to obtain a desired chemical composition.
- the chemical composition of the steel material can be a chemical composition for manufacturing a grain-oriented electrical steel sheet, and can be a known chemical composition for a grain-oriented electrical steel sheet. From the viewpoint of producing a grain-oriented electrical steel sheet having excellent magnetic properties, it is preferable to contain C, Si and Mn. Preferred contents of C, Si and Mn include the following.
- the "%" display regarding the component composition means “% by mass” unless otherwise specified.
- C 0.01-0.10% C is an element that contributes to improving the primary recrystallization texture by precipitating fine carbide. If it exceeds 0.10%, it may be difficult to reduce the content to 0.0050% or less at which magnetic aging does not occur by decarburization annealing. On the other hand, if it is less than 0.01%, the precipitation amount of fine carbides is insufficient, and the effect of improving the texture may be insufficient. Therefore, the C content is preferably 0.01 to 0.10%. More preferably 0.01 to 0.08%.
- Si 2.0-4.5%
- Si is an element effective in increasing the electric resistance of steel and improving iron loss. If the Si content exceeds 4.5%, the workability is remarkably lowered, and it may become difficult to manufacture the steel by rolling. On the other hand, if it is less than 2.0%, it may be difficult to obtain a sufficient iron loss reduction effect. Therefore, the Si content is preferably 2.0 to 4.5%. More preferably, it is 2.5 to 4.5%.
- Mn 0.01-0.50% Mn is an element necessary for improving hot workability. If the Mn content exceeds 0.50%, the primary recrystallized texture deteriorates, and it may become difficult to obtain secondary recrystallized grains in which the Goss orientation is highly concentrated. On the other hand, if it is less than 0.01%, it may become difficult to obtain sufficient hot rolling workability. Therefore, the Mn content is preferably 0.01 to 0.50%. More preferably 0.03 to 0.50%.
- the chemical composition of the steel material contains Al: 0.0100 to 0.0400% and N: 0.0050 to 0.0120% as inhibitor components in secondary recrystallization. can do. That is, if the Al content and the N content are less than the above lower limits, it may be difficult to obtain the desired inhibitory effect. On the other hand, if the above upper limit is exceeded, the dispersed state of the precipitates may become non-uniform, making it difficult to obtain the desired inhibitory effect.
- one or both of S and Se may be added as an inhibitor component: 0.01 to 0.05% in total.
- sulfides MnS, Cu 2 S, etc.
- selenides MnSe, Cu 2 Se, etc.
- Sulfides and selenides may be precipitated in combination.
- the S content and Se content are less than the above lower limits, it may be difficult to obtain a sufficient inhibitory effect.
- the above upper limit is exceeded, the dispersion of precipitates becomes non-uniform, and it may become difficult to obtain a sufficient inhibitor effect.
- the Al content can be suppressed to less than 0.0100%, making it suitable for an inhibitorless system.
- N 0.0050% or less
- S 0.0070% or less
- Se 0.0070% or less.
- Sb 0.005 to 0.500%, Cu: 0.01 to 1.50%, P: 0.005 to 0.500%, Cr 0.01-1.50%, Ni: 0.005-1.500%, Sn: 0.01-0.50%, Nb: 0.0005-0.0100%, Mo: 0.01-
- Sb, Cu, P, Cr, Ni, Sn, Nb, Mo, B, and Bi are elements that are useful for improving magnetic properties, and have the effect of improving magnetic properties without inhibiting the development of secondary recrystallized grains. When it is contained, it is preferably within the above range from the viewpoint of obtaining sufficient content.
- the balance other than the above-described components in the chemical composition of the steel material is Fe and unavoidable impurities.
- a steel slab is hot-rolled into a hot-rolled sheet.
- Steel slabs can be heated and then subjected to hot rolling.
- the heating temperature at that time is preferably about 1050° C. or higher from the viewpoint of ensuring hot rolling properties.
- the upper limit of the heating temperature is not particularly limited, but a temperature exceeding 1450°C is close to the melting point of steel and it is difficult to maintain the shape of the slab, so it is preferably 1450°C or less.
- Other hot rolling conditions are not particularly limited, and known conditions can be applied.
- the hot-rolled sheet may be subjected to hot-rolled sheet annealing as necessary.
- the annealing conditions are not particularly limited, and known conditions can be applied. If necessary, the hot-rolled sheet may be annealed and then descaled by pickling or the like before cold rolling.
- the cold-rolled sheet with the final thickness may be obtained by one cold rolling, or the cold-rolled sheet with the final thickness may be obtained by cold rolling two or more times with intermediate annealing.
- the total rolling reduction of cold rolling is not particularly limited, and can be 70% or more and 95% or less. In the present invention, it is necessary to control final cold rolling as described later.
- the rolling reduction in the final cold rolling is not particularly limited, and can be 60% or more and 95% or less.
- the final plate thickness is not particularly limited, and can be, for example, 0.1 mm or more and 1.0 mm or less.
- final cold rolling refers to the last cold rolling of the one or two or more cold rollings.
- the one cold rolling is the final cold rolling.
- the second cold rolling is the final cold rolling.
- the final cold rolling is the final cold rolling.
- the final cold rolling is performed by a tandem rolling mill, and when the steel sheet is discharged from the payoff reel and led to the first pass of the final cold rolling, the steel sheet is heated to 70° C. or more and 200° C. or less and then bitten in the first pass.
- the strain rate e (s -1 ) and bite temperature T (°C) satisfy the following equation (1). 0.0378e 2 +0.367e+37.2>T (1)
- the steel sheet heating temperature for the final cold rolling is 70°C or higher and 200°C or lower. That is, when the heating temperature is less than 70°C, fine carbides are not sufficiently precipitated, while when the heating temperature is more than 200°C, the diffusion rate of carbon becomes too high and coarse carbides are precipitated, thereby losing the effect of improving the texture by strain aging. It will crack and the magnetism will deteriorate.
- the heating temperature is preferably 100° C. or higher and 170° C. or lower.
- the strain rate e (s ⁇ 1 ) and bite temperature T (° C.) satisfy the above equation (1) in the rolling in the first pass. That is, when the rolling in the first pass satisfies the above formula (1), rolling at a low temperature or a high strain rate is realized, and as a result, a ⁇ 111 ⁇ ⁇ 112> matrix structure, which is a stable rolling orientation, can be built in. . Under rolling conditions that do not satisfy the condition of the above formula (1), the ⁇ 111 ⁇ 112> matrix structure cannot be sufficiently formed, and the effect of improving the texture is lost.
- the biting temperature T (unit: °C) in the above formula (1) is the temperature of the steel sheet immediately before biting into the rolling mill, and can be obtained by measuring with a contact thermometer or a radiation thermometer.
- the strain rate e (unit: s ⁇ 1 ) is the amount of change in nominal strain over time during rolling, and can be simply obtained by the following formula.
- t0 strip thickness at mill entrance (unit: mm)
- t1 strip thickness at mill exit (unit: mm)
- v strip speed at mill entrance (unit: mm/s)
- R work roll diameter ( The unit is mm).
- the method of heating the steel sheet before the final cold rolling is not particularly limited, and includes air bath, oil bath, sand bath, induction heating, heated lubricating oil, injection of hot water to the steel sheet, etc., but the entry side of the tandem rolling mill Therefore, a method capable of heating in a short time is desirable.
- the heating temperature is the temperature of the steel sheet on the delivery side of the heating device.
- the cooling method after heating before the final cold rolling is not particularly limited, and cooling liquid spraying, cooling rolls, oil bath, etc. can be mentioned. be.
- the tandem rolling mill used in the present invention must be equipped with a heating device on the entry side of the first stand and a cooling device on the delivery side of the heating device.
- the heating device the heating method is not particularly limited, but it is preferable because it is easy to inject hot lubricating oil or hot water, which is a high-temperature liquid, onto the steel plate.
- the cooling device the cooling type is not particularly limited, but it is preferable to spray a coolant liquid, which is a low-temperature liquid, because it is easy to implement.
- Heat treatment such as aging treatment or warm rolling may be interposed during cold rolling, but the final rolling described in Patent Document 4 is divided into a first half and a second half, and the first half is at a low temperature and the second half is A method of rolling at a high temperature is suitable for the part.
- the primary recrystallized Goss-oriented grains are thought to nucleate from shear bands introduced into the ⁇ 111 ⁇ 112> matrix structure, which is one of the rolling stable orientations. Since the ⁇ 111 ⁇ 112> matrix structure develops by cold rolling at a low temperature, the first half is rolled at a low temperature to create a large amount of the ⁇ 111 ⁇ 112> matrix structure, followed by rolling at a high temperature. Goss orientation recrystallized nuclei can be produced more efficiently.
- the cold-rolled sheet finished to the final thickness according to the above is decarburized and annealed, and then subjected to secondary recrystallization annealing to obtain a grain-oriented electrical steel sheet (product sheet).
- An insulating coating may be applied after the secondary recrystallization annealing.
- decarburization annealing often serves as primary recrystallization annealing, and the production method of the present invention can also serve as primary recrystallization annealing. In that case, by heating between 400 ° C. and 700 ° C. at a heating rate of 200 ° C./s or more in the heating process, the Goss orientation grains formed in the final cold rolling step are efficiently recrystallized. It is possible to further enhance the effect of improving the texture by Other conditions are not particularly limited, and known conditions can be applied. For example, annealing conditions such as 800° C. ⁇ 2 minutes in a hot hydrogen atmosphere can be mentioned.
- An annealing separator can be applied to the surface of the steel sheet before final annealing.
- the annealing separator is not particularly limited, and known ones can be used.
- a material containing MgO as a main component and, if necessary, TiO 2 or the like added thereto, or a material containing SiO 2 or Al 2 O 3 as a main component can be used.
- an insulating coating is not particularly limited, and when forming an insulating coating that imparts tensile tension to the surface of the steel sheet, JP 50-79442, JP 48-39338, It is preferable to bake at about 800° C. using a coating solution containing phosphate-colloidal silica, which is described in Japanese Patent Application Laid-Open No. 75579 and the like.
- the above hot-rolled sheet was subjected to hot-rolled sheet annealing at 1000°C for 60 seconds, then cooled from 800°C to 350°C at 20°C/s, and then coiled.
- the obtained hot-rolled and annealed sheet was tandem-rolled once using a tandem rolling mill (roll diameter: 300 mm, number of stands: 5) to form a cold-rolled sheet with a thickness of 0.20 mm.
- the rolling stand for the first pass was made to bite at the heating temperature, strain rate, and bite temperature for the first pass shown in Table 2.
- the heating temperature, strain rate, and bite temperature in the first pass were all within the applicable range of the present invention.
- the cold-rolled sheet was subjected to primary recrystallization annealing, which also serves as decarburization annealing, at a soaking temperature of 840°C and a soaking time of 100 seconds.
- primary recrystallization annealing which also serves as decarburization annealing, at a soaking temperature of 840°C and a soaking time of 100 seconds.
- the heating rate in the temperature range of 400°C to 700°C was set to 50°C/s or 300°C/s.
- the surface of the steel sheet was coated with an annealing separator containing MgO as a main component, and then subjected to finish annealing for secondary recrystallization.
- a coating liquid containing phosphate-chromate-colloidal silica in a weight ratio of 3:1:2 was applied to the surface of the steel sheet after the secondary recrystallization annealing, and subjected to flattening annealing at 800 ° C. for 30 seconds. , the product coil.
- the iron loss of 10 coils manufactured under the same conditions was measured, and the average value and standard deviation were obtained.
- the iron loss was measured by cutting out a sample from the longitudinal central portion of the coil so that the total weight was 500 g or more, and performing the Epstein test.
- Table 2 shows the measurement results of the iron loss together with the heating temperature, the strain rate and the biting temperature in the first pass.
- a steel slab containing 250 ppm of Al, 0.02% by mass of S and Se, and the balance being Fe and unavoidable impurities is heated to 1400 ° C. and then hot-rolled to a thickness of 2. 0 mm hot-rolled sheet.
- the hot-rolled sheet was subjected to hot-rolled sheet annealing at 1000° C. for 60 seconds, then cooled from 800° C. to 350° C. at 10° C./s, and wound into a coil.
- the obtained hot-rolled annealed sheet was cold-rolled for the first time by a tandem rolling mill (roll diameter 300 mm, number of stands 5), then, N 2 75 vol% + H 2 25 vol%, 1100 in an atmosphere with a dew point of 46 ° C. C. ⁇ 80 seconds, and during the cooling process from 800.degree. C. to 350.degree. C., cooling was performed at a cooling rate of 25.degree.
- final cold rolling was performed by a tandem rolling mill (roll diameter: 300 mm, number of stands: 5) to obtain a cold-rolled sheet with a thickness of 0.20 mm.
- the steel sheet is heated to the temperature shown in Table 3 by the steel sheet heating equipment installed between the payoff reel of the rolling mill and the first-pass rolling stand, and after heating, one pass shown in Table 3 Rolling was carried out at the strain rate shown in Table 3 by making it bite into the rolling stand of the first pass at the mesh bite temperature.
- samples were also produced in which the first-pass rolling stands were made to bite at a heating temperature of 100° C. and various strain rates and first-pass bite temperatures shown in FIG. 2 .
- the cold-rolled sheet is subjected to primary recrystallization annealing, which also serves as decarburization annealing, at a soaking temperature of 840° C. and a soaking time of 100 seconds. was applied and then subjected to finish annealing for secondary recrystallization.
- a coating liquid containing phosphate-chromate-colloidal silica in a mass ratio of 3:1:2 was applied to the surface of the steel sheet after the secondary recrystallization annealing, and flattened at 800 ° C. for 30 seconds. , the product coil.
- the iron loss of 10 coils produced under the same conditions was measured, and the average value and standard deviation were obtained.
- the iron loss was measured by cutting out a sample from the longitudinal central portion of the coil so that the total weight was 500 g or more, and performing the Epstein test.
- Table 3 shows the measurement results of the iron loss together with the heating temperature, the strain rate and the biting temperature in the first pass.
- FIG. 2 shows the relationship between the core loss measurement results and the biting temperature T (° C.) and the strain rate e (s ⁇ 1 ).
- those with an average value of iron loss of 0.9 W/kg or less and a standard deviation of 0.05 W/kg or less are indicated as "O" (invention examples), and those other than that are indicated as "X" (comparative examples). There is.
- the hot-rolled sheet was subjected to hot-rolled sheet annealing at 1000° C. for 60 seconds, then cooled from 800° C. to 350° C. at 20° C./s, and wound into a coil.
- the resulting hot-rolled annealed sheet was tandem-rolled once with a tandem rolling mill (roll diameter: 300 mm, number of stands: 5) to form a cold-rolled sheet with a thickness of 0.20 mm.
- the steel plate is heated to 100°C by a steel plate heating facility installed between the payoff reel of the rolling mill and the rolling stand of the first pass, and after heating, it is cooled to 25°C, and the strain rate is reduced. At 25 s ⁇ 1 , it was bitten into the rolling stand of the first pass.
- the cold-rolled sheet is subjected to primary recrystallization annealing, which also serves as decarburization annealing, at a soaking temperature of 840° C. for a soaking time of 100 seconds, and then an annealing separator containing MgO as a main component is applied to the surface of the steel sheet. and then subjected to finish annealing for secondary recrystallization.
- primary recrystallization annealing also serves as decarburization annealing, at a soaking temperature of 840° C. for a soaking time of 100 seconds
- an annealing separator containing MgO as a main component is applied to the surface of the steel sheet. and then subjected to finish annealing for secondary recrystallization.
- a coating liquid containing phosphate-chromate-colloidal silica in a mass ratio of 3:1:2 is applied to the surface of the steel sheet after the finish annealing, and flattened at 800 ° C. for 30 seconds to obtain a product coil. and Regarding the product coil, the iron loss of 10 coils produced under the same conditions was measured, and the average value and standard deviation were obtained. The iron loss was measured by cutting out a sample from the longitudinal central portion of the coil so that the total weight was 500 g or more, and performing the Epstein test. Table 4 shows the measurement results of the core loss together with the composition of the above-described additive components.
- steel sheets to which at least one of Sb, Cu, P, Cr, Ni, Sn, Nb, Mo, B, and Bi are added have iron loss reduced to 0.80 W/kg or less.
- the characteristic variation in the longitudinal direction of the coil was small.
Abstract
Description
鉄損のばらつきが改善されたメカニズムとしては、冷間圧延時ペイオフリールから払い出され1パス目に噛み込むまでに鋼板を加熱することにより、加熱してから1パス目に噛み込まれるまでの時間は一定となり、加熱により析出した微細カーバイドの経時変化が抑制できたためと考えられる。また、加熱後1パス目に噛み込ませる前に鋼板温度を低温にした場合に低鉄損となるメカニズムについては、以下のように考えられる。一次再結晶Goss方位粒は圧延安定方位の一つである{111}<112>マトリクス組織内に導入された剪断帯から核生成すると考えられている。
すなわち、前記実験で作製した熱延板に、1000℃×60秒の熱延板焼鈍を施し、次いで800℃から350℃までを20℃/sで冷却したのち、コイルに巻き取った。得られた熱延焼鈍板を、タンデム圧延機(ロール径300mm、スタンド数5)を用いて、1回のタンデム圧延にて0.20mmの板厚の冷延板とした。その際、圧延機のペイオフリールから1パス目の圧延スタンドの間に設置した加熱装置によって、鋼板を100℃まで加熱した。その後、噛み込み温度を20℃~180℃まで種々に変化させて噛み込ませるとともに、タンデム1パス目におけるひずみ速度を0~50s-1まで変化させた。また、鋼板を加熱せずに室温のまま1パス目に噛み込ませたコイルも作製した。
0.0378e2+0.367e+37.2>T
を満たす条件において、低鉄損であり、かつコイル毎の鉄損のばらつきが小さかった。
これらの知見をもとにさらに検討を行い、本発明を完成させた。
[1]鋼素材を熱間圧延して熱延鋼板とし、前記熱延鋼板に1回又は中間焼鈍を挟む2回以上の冷間圧延を施して最終板厚を有する冷延板とし、次いで前記冷延板に脱炭焼鈍を施したのち二次再結晶焼鈍を施す、方向性電磁鋼板の製造方法であって、
前記1回又は2回以上の冷間圧延のうち、前記1回の場合は当該冷間圧延及び前記2回以上の場合は最終回の冷間圧延を最終冷延と定義したとき、
前記最終冷延は、タンデム圧延機を用いて、鋼板を70℃以上200℃以下の温度域に加熱した後、前記タンデム圧延機の1パス目に導入し、該1パス目の圧延は、噛み込み温度T(℃)とひずみ速度e(s-1)が次式(1)を満たす、方向性電磁鋼板の製造方法。
0.0378e2+0.367e+37.2>T ・・・・(1)
C:0.01~0.10%、
Si:2.0~4.5%、
Mn:0.01~0.50%、
Al:0.0100~0.0400%、
S及びSeのいずれか1種又は2種の合計:0.01~0.05%、ならびに
N:0.0050~0.0120%
を含有し、残部がFe及び不可避的不純物の成分組成を有する、前記[1]又は[2]に記載の方向性電磁鋼板の製造方法。
C:0.01~0.10%、
Si:2.0~4.5%、
Mn:0.01~0.50%、
Al:0.0100%未満、
S:0.0070%以下、
Se:0.0070%以下及び
N:0.0050%以下
含有し、残部がFe及び不可避的不純物の成分組成を有する、前記[1]又は[2]に記載の方向性電磁鋼板の製造方法。
Sb:0.005~0.500%、
Cu:0.01~1.50%、
P:0.005~0.500%、
Cr:0.01~1.50%、
Ni:0.005~1.500%、
Sn:0.01~0.50%、
Nb:0.0005~0.0100%、
Mo:0.01~0.50%、
B:0.0010~0.0070%及び
Bi:0.0005~0.0500%
からなる群より選ばれる1種又は2種以上を含有する、前記[3]又は[4]に記載の方向性電磁鋼板の製造方法。
<鋼素材>
本発明の製造方法における鋼素材としてはスラブの他、ブルームやビレットを使用することができる。例えば、鋼スラブは、公知の製造方法によって製造されたものを用いることができる。鋼素材の製造方法としては、例えば製鋼-連続鋳造、造塊-分塊圧延法等が挙げられる。製鋼においては、転炉や電気炉等で得た溶鋼を真空脱ガス等の二次精錬を経て所望の成分組成とすることができる。
Cは、微細カーバイドを析出させることで、一次再結晶集合組織を改善するのに寄与する元素である。0.10%超では、脱炭焼鈍により、磁気時効の起こらない0.0050%以下に低減することが困難になる、おそれがある。一方、0.01%未満では、微細カーバイドの析出量が不足し、集合組織改善効果が不十分になる、おそれがある。そのため、C含有量は0.01~0.10%とすることが好ましい。より好ましくは0.01~0.08%である。
Siは、鋼の電気抵抗を高め、鉄損を改善するのに有効な元素である。Siの含有量が4.5%超では、加工性が著しく低下するため、圧延して製造することが困難になる、おそれがある。一方、2.0%未満では、十分な鉄損低減効果が得難くなる、おそれがある。そのため、Si含有量は2.0~4.5%とすることが好ましい。より好ましくは、2.5~4.5%である。
Mnは、熱間加工性を改善するために必要な元素である。Mn含有量が0.50%超では、一次再結晶集合組織が劣化し、Goss方位が高度に集積した二次再結晶粒を得るのが困難になる、おそれがある。一方、0.01%未満では、十分な熱延加工性を得るのが困難になる、おそれがある。そのため、Mn含有量は0.01~0.50%とすることが好ましい。より好ましくは0.03~0.50%である。
鋼素材の成分組成における上記した成分以外の残部は、Fe及び不可避的不純物である。
本発明の製造方法は、例えば鋼スラブを、熱間圧延して熱延板とする。鋼スラブは、加熱してから熱間圧延に供することができる。その際の加熱温度は、熱間圧延性を確保する観点から1050℃程度以上とするのが好ましい。加熱温度の上限は特に限定されないが、1450℃超の温度は、鋼の融点に近く、スラブの形状を保つのが困難であるため、1450℃以下とすることが好ましい。
それ以外の熱間圧延条件は特に限定されず、公知の条件を適用することができる。
0.0378e2+0.367e+37.2>T ・・・・(1)
これらは、噛み込み直前に噴射される鋼板冷却用のクーラント液の液量、温度など、あるいはワークロール径、圧下率、ミル通板速度などにより制御することができる。
Claims (7)
- 鋼素材を熱間圧延して熱延鋼板とし、前記熱延鋼板に1回又は中間焼鈍を挟む2回以上の冷間圧延を施して最終板厚を有する冷延板とし、次いで前記冷延板に脱炭焼鈍を施したのち二次再結晶焼鈍を施す、方向性電磁鋼板の製造方法であって、
前記1回又は2回以上の冷間圧延のうち、前記1回の場合は当該冷間圧延及び前記2回以上の場合は最終回の冷間圧延を最終冷延と定義したとき、
前記最終冷延は、タンデム圧延機を用いて、鋼板を70℃以上200℃以下の温度域に加熱した後、前記タンデム圧延機の1パス目に導入し、該1パス目の圧延は、噛み込み温度(℃)Tとひずみ速度e(s-1)が次式(1)を満たす、方向性電磁鋼板の製造方法。
0.0378e2+0.367e+37.2>T ・・・・(1) - 前記脱炭焼鈍は、400℃~700℃間を200℃/s以上の昇温速度で加熱する請求項1に記載の方向性電磁鋼板の製造方法。
- 前記鋼素材は、質量%で、
C:0.01~0.10%、
Si:2.0~4.5%、
Mn:0.01~0.50%、
Al:0.0100~0.0400%、
S及びSeのいずれか1種又は2種の合計:0.01~0.05%、ならびに
N:0.0050~0.0120%
含有し、残部がFe及び不可避的不純物の成分組成を有する、請求項1又は2に記載の方向性電磁鋼板の製造方法。 - 前記鋼素材は、質量%で、
C:0.01~0.10%、
Si:2.0~4.5%、
Mn:0.01~0.50%、
Al:0.0100%未満、
S:0.0070%以下、
Se:0.0070%以下及び
N:0.0050%以下
を含有し、残部がFe及び不可避的不純物の成分組成を有する、請求項1又は2記載の方向性電磁鋼板の製造方法。 - 前記鋼素材は、さらに、質量%で、
Sb:0.005~0.500%、
Cu:0.01~1.50%、
P:0.005~0.500%、
Cr:0.01~1.50%、
Ni:0.005~1.500%、
Sn:0.01~0.50%、
Nb:0.0005~0.0100%、
Mo:0.01~0.50%、
B:0.0010~0.0070%及び
Bi:0.0005~0.0500%
からなる群より選ばれる1種又は2種以上を含有する、請求項3又は4に記載の方向性電磁鋼板の製造方法。 - 方向性電磁鋼板の製造ライン上に配置したタンデム圧延機と、前記タンデム圧延機の第1スタンドの入側にて前記製造ラインの上流側から順に配置した加熱装置及び冷却装置と、を有する、方向性電磁鋼板製造用圧延設備。
- 前記加熱装置は高温の液体を前記製造ライン上の鋼板に噴射する機能を有し、前記冷却装置は低温の液体を前記製造ライン上の鋼板に噴射する機能を有する、請求項6に記載の方向性電磁鋼板製造用圧延設備。
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KR1020237043862A KR20240011758A (ko) | 2021-06-30 | 2022-06-30 | 방향성 전기 강판의 제조 방법 및 방향성 전기 강판 제조용 압연 설비 |
CN202280045169.1A CN117561342A (zh) | 2021-06-30 | 2022-06-30 | 取向性电磁钢板的制造方法和取向性电磁钢板制造用轧制设备 |
EP22833315.9A EP4353850A1 (en) | 2021-06-30 | 2022-06-30 | Method for manufacturing oriented electromagnetic steel sheet and rolling equipment for manufacturing oriented electromagnetic steel sheet |
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JPS4839338A (ja) | 1971-09-27 | 1973-06-09 | ||
JPS5079442A (ja) | 1973-11-17 | 1975-06-27 | ||
JPS5675579A (en) | 1979-11-22 | 1981-06-22 | Kawasaki Steel Corp | Method of forming top coating insulation film of tension addition type without containing chromium oxide on directional silicone steel plate |
JPH04120216A (ja) * | 1990-09-10 | 1992-04-21 | Kawasaki Steel Corp | 磁気特性の優れた方向性けい素鋼板の製造方法 |
JPH04120215A (ja) * | 1990-03-02 | 1992-04-21 | Kawasaki Steel Corp | 磁気特性および表面性状に優れた方向性けい素鋼板の製造方法 |
WO2020067236A1 (ja) * | 2018-09-28 | 2020-04-02 | Jfeスチール株式会社 | 方向性電磁鋼板の製造方法および冷間圧延設備 |
JP2020116587A (ja) * | 2019-01-21 | 2020-08-06 | 日本製鉄株式会社 | 圧延設備及び圧延方法 |
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JPS5413846B2 (ja) | 1973-06-18 | 1979-06-02 | ||
JPH01215925A (ja) | 1988-02-25 | 1989-08-29 | Nippon Steel Corp | 一方向性電磁鋼板の冷間圧延方法 |
JPH08253816A (ja) | 1995-03-15 | 1996-10-01 | Nippon Steel Corp | 超高磁束密度一方向性電磁鋼板の製造方法 |
JP3873309B2 (ja) | 1995-12-01 | 2007-01-24 | Jfeスチール株式会社 | 方向性電磁鋼板の製造方法 |
-
2022
- 2022-06-30 EP EP22833315.9A patent/EP4353850A1/en active Pending
- 2022-06-30 JP JP2022571897A patent/JPWO2023277169A1/ja active Pending
- 2022-06-30 CN CN202280045169.1A patent/CN117561342A/zh active Pending
- 2022-06-30 WO PCT/JP2022/026421 patent/WO2023277169A1/ja active Application Filing
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Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS4839338A (ja) | 1971-09-27 | 1973-06-09 | ||
JPS5079442A (ja) | 1973-11-17 | 1975-06-27 | ||
JPS5675579A (en) | 1979-11-22 | 1981-06-22 | Kawasaki Steel Corp | Method of forming top coating insulation film of tension addition type without containing chromium oxide on directional silicone steel plate |
JPH04120215A (ja) * | 1990-03-02 | 1992-04-21 | Kawasaki Steel Corp | 磁気特性および表面性状に優れた方向性けい素鋼板の製造方法 |
JPH04120216A (ja) * | 1990-09-10 | 1992-04-21 | Kawasaki Steel Corp | 磁気特性の優れた方向性けい素鋼板の製造方法 |
WO2020067236A1 (ja) * | 2018-09-28 | 2020-04-02 | Jfeスチール株式会社 | 方向性電磁鋼板の製造方法および冷間圧延設備 |
JP2020116587A (ja) * | 2019-01-21 | 2020-08-06 | 日本製鉄株式会社 | 圧延設備及び圧延方法 |
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JPWO2023277169A1 (ja) | 2023-01-05 |
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