JP6655084B2 - 方向性電磁鋼板およびその製造方法 - Google Patents
方向性電磁鋼板およびその製造方法 Download PDFInfo
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- JP6655084B2 JP6655084B2 JP2017534251A JP2017534251A JP6655084B2 JP 6655084 B2 JP6655084 B2 JP 6655084B2 JP 2017534251 A JP2017534251 A JP 2017534251A JP 2017534251 A JP2017534251 A JP 2017534251A JP 6655084 B2 JP6655084 B2 JP 6655084B2
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- 229910001224 Grain-oriented electrical steel Inorganic materials 0.000 title claims description 36
- 238000004519 manufacturing process Methods 0.000 title claims description 23
- 229910000831 Steel Inorganic materials 0.000 claims description 180
- 239000010959 steel Substances 0.000 claims description 180
- 238000000137 annealing Methods 0.000 claims description 132
- 229910052839 forsterite Inorganic materials 0.000 claims description 93
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 claims description 91
- 238000001953 recrystallisation Methods 0.000 claims description 79
- 239000011248 coating agent Substances 0.000 claims description 56
- 238000000576 coating method Methods 0.000 claims description 56
- 238000000034 method Methods 0.000 claims description 56
- 239000010410 layer Substances 0.000 claims description 44
- 230000005381 magnetic domain Effects 0.000 claims description 32
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 21
- 229910052760 oxygen Inorganic materials 0.000 claims description 21
- 239000001301 oxygen Substances 0.000 claims description 21
- 238000002791 soaking Methods 0.000 claims description 21
- 239000011247 coating layer Substances 0.000 claims description 19
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 17
- 239000000203 mixture Substances 0.000 claims description 15
- 229910001463 metal phosphate Inorganic materials 0.000 claims description 13
- 229910052739 hydrogen Inorganic materials 0.000 claims description 12
- 229910019142 PO4 Inorganic materials 0.000 claims description 11
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 11
- 239000010452 phosphate Substances 0.000 claims description 11
- 238000005096 rolling process Methods 0.000 claims description 10
- 229910004283 SiO 4 Inorganic materials 0.000 claims description 9
- 239000010960 cold rolled steel Substances 0.000 claims description 9
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 8
- 239000001257 hydrogen Substances 0.000 claims description 8
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 150000001875 compounds Chemical class 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 7
- 230000001678 irradiating effect Effects 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 238000007670 refining Methods 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 239000008119 colloidal silica Substances 0.000 claims description 5
- 150000004767 nitrides Chemical class 0.000 claims description 5
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims 1
- 229910052717 sulfur Inorganic materials 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 40
- 229910052742 iron Inorganic materials 0.000 description 14
- 238000005261 decarburization Methods 0.000 description 10
- 239000013078 crystal Substances 0.000 description 9
- 230000000149 penetrating effect Effects 0.000 description 9
- 238000005097 cold rolling Methods 0.000 description 8
- 230000001590 oxidative effect Effects 0.000 description 6
- 239000003966 growth inhibitor Substances 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 238000005098 hot rolling Methods 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 239000003112 inhibitor Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000005389 magnetism Effects 0.000 description 3
- 238000005121 nitriding Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 2
- 229910001347 Stellite Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- AHICWQREWHDHHF-UHFFFAOYSA-N chromium;cobalt;iron;manganese;methane;molybdenum;nickel;silicon;tungsten Chemical compound C.[Si].[Cr].[Mn].[Fe].[Co].[Ni].[Mo].[W] AHICWQREWHDHHF-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 150000003568 thioethers Chemical class 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- -1 borides Chemical class 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000003486 chemical etching Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 239000011162 core material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- 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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- 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
- C21D8/1283—Application of a separating or insulating coating
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/062—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam
- B23K26/0622—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam by shaping pulses
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/362—Laser etching
- B23K26/364—Laser etching for making a groove or trench, e.g. for scribing a break initiation groove
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- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/40—Removing material taking account of the properties of the material involved
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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- 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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- C21D8/1233—Cold rolling
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- 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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- 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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- 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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- 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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- 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
- C21D8/1288—Application of a tension-inducing coating
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- 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
- C21D8/1294—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a localized treatment
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- 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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- 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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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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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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- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/10—Oxidising
- C23C8/16—Oxidising using oxygen-containing compounds, e.g. water, carbon dioxide
- C23C8/18—Oxidising of ferrous surfaces
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- H—ELECTRICITY
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- 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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Description
20:アンカー
100:素地鋼板
200:フォルステライト層
300:絶縁被膜
Claims (16)
- 電磁鋼板の表面に存在するグルーブと、
前記電磁鋼板の表面の一部または全部に形成されたフォルステライト層とを含むが、
前記フォルステライト層から一体に延びて素地鋼板側に形成された3次元網目構造のフォルステライトアンカーが、前記グルーブの縁から50μm以内の表面に2個以上存在し、
前記素地鋼板側に形成された3次元網目構造のフォルステライトアンカーは、前記フォルステライト層の平均厚さの1/3以上の長さであり、
前記素地鋼板側に形成された3次元網目構造のフォルステライトアンカーの前記電磁鋼板の厚さ方向への長さは、0.3〜10μmであり、
前記素地鋼板側に形成された3次元網目構造のフォルステライトアンカーは、幅が3.5μm以下であり、前記フォルステライトアンカーの幅は、前記電磁鋼板の圧延方向の幅であり、
前記グルーブが存在する電磁鋼板の表面に絶縁コーティング層がさらに形成されており、
前記絶縁コーティング層は、コロイダルシリカおよび金属リン酸塩を含み、
前記絶縁コーティング層は、MgまたはAlを絶縁コーティング層の重量対比で25重量%以上含み、
前記グルーブと鋼板の幅方向のなす角度は、平行であるか、5°以下(0°を含まない)である方向性電磁鋼板。 - 前記電磁鋼板の圧延方向をx軸、前記電磁鋼板の幅方向をy軸、xy平面の法線方向をz軸とし、前記xz平面で前記素地鋼板側に形成された3次元網目構造のフォルステライトアンカーを観察した時、鉤形態または錨(anchor)形態である、請求項1に記載の方向性電磁鋼板。
- 前記フォルステライト層の平均厚さは、0.1μm〜3μmである、請求項1または2に記載の方向性電磁鋼板。
- 前記グルーブの深さは、電磁鋼板の厚さの3%〜10%である、請求項1〜3のいずれか1項に記載の方向性電磁鋼板。
- 前記電磁鋼板は、電磁鋼板の全体組成100重量%を基準として、O:0.0020〜0.0080重量%、Si:2.5〜4.0重量%、C:0.02〜0.10重量%、Al:0.02〜0.04重量%、Mn:0.05〜0.20重量%、N:0.002〜0.012重量%、S:0.001重量%〜0.010重量%、およびP:0.01〜0.08重量%を含み、残部はFeおよび不純物を含む、請求項1〜4のいずれか1項に記載の方向性電磁鋼板。
- スラブの全体組成100重量%を基準として、O:0.0020〜0.0080重量%を含み、残部はFeおよび不純物を含むスラブを、1300℃以下に加熱した後、熱間圧延した後、冷間圧延して、冷延鋼板を製造する段階と、
前記冷延鋼板を、800〜890℃の温度範囲、露点60〜70℃(50%N 2 +50%H 2 )の雰囲気で一次再結晶焼鈍する段階と、
前記一次再結晶焼鈍が完了した鋼板を、MgOを含む焼鈍分離剤を塗布した後、二次再結晶焼鈍する段階とを含み、
前記鋼板にグルーブを形成して磁区微細化処理する段階を含むが、
前記磁区微細化処理する段階は、二次再結晶焼鈍が完了した後に実施し、
前記磁区微細化処理する段階の後、前記鋼板に絶縁コーティング液で絶縁コーティングする段階をさらに含み、
前記絶縁コーティング液は、コロイダルシリカと少なくとも50重量%の金属リン酸塩とを含み、
前記絶縁コーティング液において、前記金属リン酸塩は、Alリン酸塩、Mgリン酸塩、またはこれらの組み合わせであり、前記絶縁コーティング液の重量対比で、Al、Mg、またはこれらの組み合わせの含有量は、15重量%以上であり、
前記一次再結晶焼鈍過程で形成された鋼板表面の酸化層のSiO2/Fe2SiO4の重量比は、0.1〜1.5である、方向性電磁鋼板の製造方法であって、
前記方向性電磁鋼板の表面の一部または全部に形成されたフォルステライト層を含み、
前記フォルステライト層から一体に延びて素地鋼板側に形成された3次元網目構造のフォルステライトアンカーが、前記グルーブの縁から50μm以内の表面に2個以上存在し、
前記素地鋼板側に形成された3次元網目構造のフォルステライトアンカーは、前記フォルステライト層の平均厚さの1/3以上の長さであり、
前記素地鋼板側に形成された3次元網目構造のフォルステライトアンカーの前記電磁鋼板の厚さ方向への長さは、0.3〜10μmであり、
前記素地鋼板側に形成された3次元網目構造のフォルステライトアンカーは、幅が3.5μm以下であり、前記フォルステライトアンカーの幅は、前記電磁鋼板の圧延方向の幅であり、
前記磁区微細化処理する段階で形成されたグルーブと鋼板の幅方向のなす角度は、平行であるか、5°以下(0°を含まない)である、
方向性電磁鋼板の製造方法。 - 前記一次再結晶焼鈍過程で形成された鋼板表面の酸素層の酸素量は、600〜1,000ppmの範囲である、請求項6に記載の方向性電磁鋼板の製造方法。
- 前記焼鈍分離剤は、スラリー状にMgOを主成分とし、これに、反応促進剤として、Ti化合物、Cl化合物、硫化物、ホウ化物、窒化物、または酸化物を単数または複数混合して、前記鋼板の片面あたり2.5〜12g/m2で塗布する、請求項6または7に記載の方向性電磁鋼板の製造方法。
- 前記焼鈍分離剤の主成分のMgOは、平均粉末粒径が2.5μm以下である、請求項6〜8のいずれか1項に記載の方向性電磁鋼板の製造方法。
- 前記焼鈍分離剤の主成分のMgOは、粉末粒径2μm以下が10%以上である、請求項6〜9のいずれか1項に記載の方向性電磁鋼板の製造方法。
- 前記二次再結晶焼鈍は、550〜750℃における一次均熱過程と、1,000〜1,250℃における二次均熱過程とに区分して実施し、昇温時、650〜950℃の温度区間では時間あたり30〜100℃に昇温し、950〜1,250℃の温度区間では時間あたり45℃以下に昇温する、請求項6〜10のいずれか1項に記載の方向性電磁鋼板の製造方法。
- 前記二次再結晶焼鈍において、前記一次均熱過程は10分以上であり、前記二次均熱時間は8時間以上である、請求項11に記載の方向性電磁鋼板の製造方法。
- 前記二次再結晶焼鈍において、前記二次均熱温度までは窒素と水素との混合雰囲気で実施し、前記二次均熱温度到達後には水素雰囲気で実施する、請求項11または12に記載の方向性電磁鋼板の製造方法。
- 前記磁区微細化処理する段階で形成されたグルーブの深さは、電磁鋼板の厚さの3%〜10%である、請求項6〜13のいずれか1項に記載の方向性電磁鋼板の製造方法。
- 前記磁区微細化処理する段階は、ガウシアンビーム形態の連続波レーザを照射して磁区微細化処理されるものである、請求項6〜14のいずれか1項に記載の方向性電磁鋼板の製造方法。
- 前記スラブは、スラブの全体組成100重量%を基準として、Si:2.5〜4.0重量%、C:0.02〜0.10重量%、Al:0.02〜0.04重量%、Mn:0.05〜0.20重量%、N:0.002〜0.012重量%、S:0.001重量%〜0.010重量%、およびP:0.01〜0.08重量%をさらに含む、請求項6〜15のいずれか1項に記載の方向性電磁鋼板の製造方法。
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US20180010206A1 (en) | 2018-01-11 |
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