JP6208855B2 - 配向性高ケイ素鋼の製造方法 - Google Patents
配向性高ケイ素鋼の製造方法 Download PDFInfo
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- JP6208855B2 JP6208855B2 JP2016515529A JP2016515529A JP6208855B2 JP 6208855 B2 JP6208855 B2 JP 6208855B2 JP 2016515529 A JP2016515529 A JP 2016515529A JP 2016515529 A JP2016515529 A JP 2016515529A JP 6208855 B2 JP6208855 B2 JP 6208855B2
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- strip
- rolling
- temperature
- cold
- rolled
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- 229910000976 Electrical steel Inorganic materials 0.000 title claims description 51
- 238000004519 manufacturing process Methods 0.000 title claims description 14
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- 229910052739 hydrogen Inorganic materials 0.000 claims description 19
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- 229910052782 aluminium Inorganic materials 0.000 claims description 14
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Classifications
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- H—ELECTRICITY
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- 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
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- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
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- B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels
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- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
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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
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- C—CHEMISTRY; METALLURGY
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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
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- 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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- C21D8/1272—Final recrystallisation annealing
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- C—CHEMISTRY; METALLURGY
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- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
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- C22C—ALLOYS
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Description
2)二次再結晶の発生を満足するための必須条件は、帯鋼の一次再結晶における結晶粒の成長が強く抑制されることであり、高Si鋼が冷間圧延により変形された後、粒界移動の速度の向上に抑制効果がもっと強い抑制剤が必要である。
3)抑制剤は化合物(例えばS化物及びN化物等)でもよく、単体(例えばCu、Sn、B等)でもよい。前者は高温での固溶及び相変態・析出により制御する必要があるが鋳片の高温過熱により結晶粒が粗大化しすぎる場合もある。しかし、高ケイ素鋼はフェライト単相であるので、N化物の微細化析出を制御する相変態窓口がない。一方、単体化合物は一般的に補助抑制剤として使用されており、単独使用による抑制力が不十分で、また基体を固溶強化しやすく、塑性に影響を与える。
Claims (3)
- (1)質量%で、C:0.001〜0.003%、Si:5.0〜6.6%、Mn:0.2〜0.3%、Al:0.05〜0.12%、V:0.01〜0.04%、Nb:0.03〜0.06%、S:0.02〜0.03%、N:0.009〜0.020%、O≦0.0020%を含有し、残部はFe及び不可避的不純物からなる溶鋼を製錬する工程と、
(2)溶鋼をゲートから、予熱温度が1200〜1250℃で、過熱度が20〜50℃に制御されたタンディッシュに注入し、溶鋼がタンディッシュを通過してストリップ鋳造機に入り、厚みが1.8〜3.0mmである鋳造ストリップを形成するストリップ鋳造工程と、
(3)鋳造ストリップをローラーから出した後、不活性雰囲気の条件下で、50〜100℃/sの速度で1000〜1050℃まで冷却し、その後、圧延開始温度を1000〜1050℃、圧延仕上げ温度を900〜980℃、圧下量を10〜15%として熱間圧延を行い、熱間圧延鋳造ストリップを製造する工程と、
(4)熱間圧延鋳造ストリップを20〜30℃/sの速度で550〜600℃まで冷却し巻き取り、その後、窒素ガス雰囲気の条件下で、圧延開始温度を760±5℃、圧延仕上げ温度を550〜600℃、総圧下量を70〜80%として温間圧延を行い、温間圧延ストリップを製造する工程と、
(5)温間圧延ストリップを酸洗してスケールを除去し、その後総圧下量が60〜80%となるように100〜200℃で多パスの冷間圧延を行い、連続する2パスの間において280〜320℃で240〜300秒保持する時効処理を、冷間圧延の過程において2〜3回行い、冷間圧延ストリップを得る工程と、
(6)前記冷間圧延ストリップを、露点が30〜60℃の窒素水素混合雰囲気下において、850±10℃で120〜180秒保持する再結晶焼鈍を行い、その後、MgOコーティングを塗布し、最後に巻き取り、コーティング冷間圧延ストリップを得る工程と、
(7)前記コーティング冷間圧延ストリップを400±10℃の環状炉内に置き、水素ガスを流通させる条件下で、まず30〜40℃/hの速度で1000±10℃まで昇温し、そして10〜20℃/hの速度で1130±10℃まで昇温し、さらに30〜40℃/hの速度で1220〜1240℃まで昇温し、20〜30h保温して純化焼鈍を行う工程と、
(8)純化焼鈍されたコーティング冷間圧延ストリップから酸化スケールを除去することで素地調整し、さらに絶縁層を塗布し、その後800±10℃で焼鈍を行った後、引張して平坦化し、最後に650℃以下まで空冷し巻き取り、方向性高ケイ素鋼を得る工程と、
を含むことを特徴とする方向性高ケイ素鋼の製造方法。 - 前記方向性高ケイ素鋼の厚みは0.10〜0.25mmであることを特徴とする請求項1に記載の方向性高ケイ素鋼の製造方法。
- 前記方向性高ケイ素鋼の磁気特性は、P10/50が0.18〜0.62W/kg、P10/400が6.75〜9.5W/kg、磁気誘導B8が1.74〜1.81T、B8/BS=0.961〜0.978であることを特徴とする請求項1に記載の方向性高ケイ素鋼の製造方法。
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