JP7623636B2 - 方向性電磁鋼板の製造方法 - Google Patents
方向性電磁鋼板の製造方法 Download PDFInfo
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Description
記
・A群;Al:0.010~0.050mass%およびN:0.003~0.020mass%
・B群;Al:0.010~0.050mass%およびN:0.003~0.020mass%、Se:0.003~0.030mass%および/またはS:0.002~0.030mass%
C:0.030mass%、Si:3.0mass%、Mn:0.014mass%を含有し、かつ、Al:0.038mass%、N:0.011mass%、Se:0.022mass%およびS:0.009mass%を含有し、残部がFeおよび不可避的不純物の成分組成からなる鋼スラブを連続鋳造法で製造した。次いで、該スラブを1350℃の温度に加熱した後、熱間圧延して板厚2.4mmの熱延板に仕上げた。次いで、上記熱延板に1100℃×30秒の熱延板焼鈍を施した後、1回目の冷間圧延して1.8mmの中間板厚とし、1020℃×100秒の中間焼鈍を施した後、リバース圧延機で2回目の冷間圧延して最終板厚0.23mmの冷延板に仕上げた。次いで、上記冷延板に、50vol%H2-50vol%N2の湿潤雰囲気下で、880℃×60秒の一次再結晶焼鈍を兼ねた脱炭焼鈍を施した。この際、500~700℃間の昇温速度は、30℃/sおよび200℃/sの2水準とした。次いで、MgOを主体とする焼鈍分離剤を鋼板表面に塗布し、コイルに巻いた状態の鋼板を、N2雰囲気下で、25℃/hrで900℃まで昇温し、上記温度に20hr保持した後、25℃/hrで970℃まで昇温し、さらに、H2:50vol%-N2:50vol%の混合雰囲気下で25℃/hrで1180℃まで昇温し、H2雰囲気下で上記温度に5hr保持して純化処理する仕上焼鈍を施した。
脱炭焼鈍の昇温速度を高めると、一次再結晶組織中のゴス方位とその近傍の再結晶粒が増加する。それにより、増加したゴス方位とその近傍の一次再結晶粒が仕上焼鈍において二次再結晶し、細粒化した二次再結晶組織となる。ここで、本発明が提案するように、860~970℃の温度範囲において0.5~4.0℃/hrで徐加熱した場合には、ゴス方位粒のその近傍粒に対する粒成長性が優位となり、二次再結晶組織の方位先鋭性が高まり、磁束密度B8が高まる。これに対し、昇温速度が0.5℃/hr未満では、ゴス方位粒とその近傍粒との粒成長性の差が小さく、二次再結晶組織の方位先鋭性が低下し、一方、昇温速度4.0℃/hrを超えると、ゴス方位とその近傍粒の成長速度がともに大幅に増加し、やはり、二次再結晶組織の方位先鋭性が低下するものと考えている。
本発明は、上記の新規な知見に基づき、開発したものである。
C:0.002~0.10mass%
Cは、0.002mass%未満だと、Cによる粒界強化効果が失われ、スラブに割れが生じて、製造時に支障を来たしたり、表面欠陥が発生したりするおそれがある。一方、0.10mass%を超えると、脱炭焼鈍時に磁気時効が起こらない0.005mass%以下までCを低減することが困難となる。よって、Cは0.002~0.10mass%の範囲とする。好ましくは0.010~0.080mass%の範囲である。
Siは、鋼の比抵抗を高めて鉄損を低減するのに必須の成分であり、2.0mass%未満では上記効果が十分ではなく、一方、8.0mass%を超えると、加工性が低下し、圧延すること難しくなる。よって、Siは2.0~8.0mass%の範囲とする。好ましくは2.5~4.5mass%の範囲である。
Mnは、鋼の熱間加工性を改善するであり、0.005mass%以上含有させる必要がある。一方、1.0mass%を超えると、製品板の磁束密度が低下するようになる。よって、Mnは0.005~1.0mass%の範囲とする。好ましくは0.02~0.20mass%の範囲である。
本発明の方向性電磁鋼板の製造方法は、上記に説明した成分組成を有する鋼素材(スラブ)を所定の温度に加熱し、熱間圧延して熱延板とし、該熱延板に熱延板焼鈍を施した後、1回の冷間圧延または中間焼鈍を挟む2回以上の冷間圧延して最終板厚の冷延板とし、該冷延板に一次再結晶焼鈍を兼ねた脱炭焼鈍を施し、鋼板表面に焼鈍分離剤を塗布した後、仕上焼鈍を施し、絶縁被膜を被成する一連の工程からなる。以下、具体的に説明する。
Claims (4)
- C:0.002~0.10mass%、Si:2.0~8.0mass%およびMn:0.005~1.0mass%を含有し、さらに、インヒビター形成成分として、下記A群またはB群の成分を含有し、残部がFeおよび不可避的不純物からなる成分組成を有する鋼素材を1300℃以上1400℃以下の温度に加熱し、熱間圧延して熱延板とし、該熱延板に熱延板焼鈍を施した後、1回の冷間圧延または中間焼鈍を挟む2回以上の冷間圧延して最終板厚の冷延板とし、該冷延板に一次再結晶焼鈍を兼ねた脱炭焼鈍を施した後、鋼板表面に焼鈍分離剤を塗布し、仕上焼鈍を施した後、絶縁被膜を被成するにあたり、上記脱炭焼鈍の加熱過程における500~700℃間を100~1000℃/sで急速加熱するとともに、
上記仕上焼鈍の加熱過程の860~970℃の区間において、0.5~4.0℃/hrの昇温速度で昇温することを徐加熱といい、少なくとも900~960℃の区間は前記徐加熱を施す方向性電磁鋼板の製造方法。
ただし、前記熱延板焼鈍または前記中間焼鈍の、焼鈍後の冷却過程において、800℃から300℃までを平均冷却速度200℃/s以上で急速冷却する場合を除く。
記
・A群;Al:0.010~0.050mass%およびN:0.003~0.020mass%
・B群;Al:0.010~0.050mass%およびN:0.003~0.020mass%、Se:0.003~0.030mass%および/またはS:0.002~0.030mass% - 上記鋼素材は、上記成分組成に加えてさらに、Ni:0.01~1.50mass%、Cr:0.01~0.50mass%、Cu:0.005~1.000mass%、P:0.005~0.500mass%、Sb:0.005~0.500mass%、Sn:0.005~0.500mass%、Bi:0.005~0.500mass%、Mo:0.005~0.500mass%、Nb:0.0010~0.0100mass%、Ta:0.001~0.010mass%およびTi:0.001~0.0100mass%のうちの少なくとも1種を含有することを特徴とする請求項1に記載の方向性電磁鋼板の製造方法。
- 上記冷間圧延後のいずれかの工程で鋼板表面に圧延方向と交差する方向に溝を形成して磁区細分化処理を施すことを特徴とする請求項1または2に記載の方向性電磁鋼板の製造方法。
- 上記絶縁被膜を被成した鋼板表面に圧延方向と交差する方向に電子ビームまたはレーザービームを照射して磁区細分化処理を施すことを特徴とする請求項1または2に記載の方向性電磁鋼板の製造方法。
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| WO2014132930A1 (ja) | 2013-02-28 | 2014-09-04 | Jfeスチール株式会社 | 方向性電磁鋼板の製造方法 |
| JP2019163518A (ja) | 2018-03-20 | 2019-09-26 | 日本製鉄株式会社 | 一方向性電磁鋼板の製造方法 |
| WO2020218329A1 (ja) | 2019-04-23 | 2020-10-29 | Jfeスチール株式会社 | 方向性電磁鋼板の製造方法 |
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| JPS59190325A (ja) * | 1983-04-09 | 1984-10-29 | Nippon Steel Corp | 連続鋳造法を適用した鉄損の優れた一方向性珪素鋼板の製造法 |
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| JPH04272166A (ja) * | 1991-02-27 | 1992-09-28 | Kawasaki Steel Corp | 超低鉄損一方向性けい素鋼板の製造方法 |
| JPH0762436B2 (ja) | 1991-11-06 | 1995-07-05 | 厚一 植村 | オープンシールド工法 |
| JP2983128B2 (ja) | 1993-08-24 | 1999-11-29 | 新日本製鐵株式会社 | 極めて低い鉄損をもつ一方向性電磁鋼板の製造方法 |
| JP3392664B2 (ja) | 1996-10-31 | 2003-03-31 | 新日本製鐵株式会社 | 極めて低い鉄損をもつ一方向性電磁鋼板の製造方法 |
| JP3707268B2 (ja) | 1998-10-28 | 2005-10-19 | Jfeスチール株式会社 | 方向性電磁鋼板の製造方法 |
| JP5234222B2 (ja) * | 2010-04-01 | 2013-07-10 | 新日鐵住金株式会社 | 方向性電磁鋼板及びその製造方法 |
| JP5672273B2 (ja) * | 2012-07-26 | 2015-02-18 | Jfeスチール株式会社 | 方向性電磁鋼板の製造方法 |
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| JP2019163518A (ja) | 2018-03-20 | 2019-09-26 | 日本製鉄株式会社 | 一方向性電磁鋼板の製造方法 |
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