JPWO2010116936A1 - 方向性電磁鋼板用鋼の処理方法及び方向性電磁鋼板の製造方法 - Google Patents
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Abstract
Description
Ts−Ta≦70 ・・・(式1)
第1の実験では、先ず、C:0.060質量%、Si:3.37質量%、Mn:0.099質量%、P:0.025質量%、S:0.0067質量%、Cr:0.12質量%、酸可溶性Al:0.0284質量%、N:0.0081質量%、Sn:0.06質量%、及びTi:0.0017質量%を含有し、残部がFe及び不可避的不純物からなる鋼を溶製した。次いで、溶鋼を連続鋳造して厚さが250mmのスラブを得た。その後、表1に示すように、1070℃〜1230℃でスラブ再加熱を行った。スラブ再加熱の時間は5時間〜5.5時間とした。なお、連続鋳造の開始からスラブ再加熱の開始までの間、スラブの温度を連続的に低下させ、表1に示すように、スラブの表面温度が98℃〜625℃まで低下したときに再加熱炉に装入した。スラブ再加熱後には、890℃狙いで熱間圧延を開始し、厚さが2.8mmの熱間圧延鋼帯を560℃狙いで巻取った。但し、熱間圧延が不可能なスラブも存在した。
第2の実験では、先ず、C:0.064質量%、Si:3.48質量%、Mn:0.11質量%、P:0.023質量%、S:0.0070質量%、Cr:0.12質量%、酸可溶性Al:0.0280質量%、N:0.0083質量%、Cu:0.15質量%、Sn:0.065質量%、及びTi:0.0017質量%を含有し、残部がFe及び不可避的不純物からなる鋼を溶製した。次いで、溶鋼を連続鋳造して厚さが250mmのスラブを得た。その後、表2に示すように、1070℃〜1195℃でスラブ再加熱を行った。スラブ再加熱の時間は5時間〜5.5時間とした。なお、連続鋳造の開始からスラブ再加熱の開始までの間、スラブの温度を連続的に低下させ、表2に示すように、スラブの表面温度が224℃〜552℃まで低下したときに再加熱炉に装入した。スラブ再加熱後には、890℃狙いで熱間圧延を開始し、厚さが2.6mmの熱間圧延鋼帯を560℃狙いで巻取った。但し、熱間圧延が不可能なスラブも存在した。
Claims (12)
- 連続鋳造により得られた方向性電磁鋼板用のスラブのスラブ再加熱を行う工程と、
前記スラブの熱間圧延を行って熱間圧延鋼帯を得る工程と、
前記熱間圧延鋼帯の焼鈍を行って、一次インヒビターが析出した焼鈍鋼帯を得る工程と、
前記焼鈍鋼帯を1回以上、冷間圧延して冷間圧延鋼帯を得る工程と、
前記冷間圧延鋼帯の脱炭焼鈍を行って、一次再結晶が生じた脱炭焼鈍鋼帯を得る工程と、
前記脱炭焼鈍鋼帯に対して、その走行状態下で水素、窒素及びアンモニアの混合ガス中で窒化して、二次インヒビターを導入した窒化処理鋼帯を得る工程と、
MgOを主成分とする焼鈍分離剤を前記窒化処理鋼帯に塗布する工程と、
前記窒化処理鋼帯の仕上焼鈍により、二次再結晶を生じさせる工程と、
を有し、
前記連続鋳造の開始から前記スラブ再加熱の開始までの間に、前記スラブの表面温度を600℃以下まで低下させ、
前記連続鋳造の開始から前記スラブ再加熱の開始までの間、前記スラブの表面温度を150℃以上に保持し、
前記スラブ再加熱における前記スラブの表面温度を1080℃以上1200℃以下とすることを特徴とする方向性電磁鋼板用鋼の処理方法。 - 前記熱間圧延鋼帯の焼鈍における温度をTa(℃)、前記スラブ再加熱における前記スラブの表面温度をTs(℃)としたとき、「Ts−Ta≦70」の関係が満たされることを特徴とする請求項1に記載の方向性電磁鋼板用鋼の処理方法。
- 前記熱間圧延鋼帯の焼鈍時に、温度をTaとする時間を90秒間以内とすることを特徴とする請求項2に記載の方向性電磁鋼板用鋼の処理方法。
- 前記熱間圧延鋼帯の焼鈍における温度を980℃以上1180℃と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用鋼の処理方法。
- 前記熱間圧延鋼帯の焼鈍における温度を980℃以上1180℃とすることを特徴とする請求項2に記載の方向性電磁鋼板用鋼の処理方法。
- 前記熱間圧延鋼帯の焼鈍における温度を980℃以上1180℃とすることを特徴とする請求項3に記載の方向性電磁鋼板用鋼の処理方法。
- 方向性電磁鋼板用溶鋼の連続鋳造を行ってスラブを得る工程と、
前記スラブのスラブ再加熱を行う工程と、
次に、前記スラブの熱間圧延を行って熱間圧延鋼帯を得る工程と、
前記熱間圧延鋼帯の焼鈍を行って、一次インヒビターが析出した焼鈍鋼帯を得る工程と、
前記焼鈍鋼帯を1回以上、冷間圧延して冷間圧延鋼帯を得る工程と、
前記冷間圧延鋼帯の脱炭焼鈍を行って、一次再結晶が生じた脱炭焼鈍鋼帯を得る工程と、
前記脱炭焼鈍鋼帯に対して、その走行状態下で水素、窒素及びアンモニアの混合ガス中で窒化して、二次インヒビターを導入した窒化処理鋼帯を得る工程と、
MgOを主成分とする焼鈍分離剤を前記窒化処理鋼帯に塗布する工程と、
前記窒化処理鋼帯の仕上焼鈍により、二次再結晶を生じさせる工程と、
を有し、
前記連続鋳造の開始から前記スラブ再加熱の開始までの間に、前記スラブの表面温度を600℃以下まで低下させ、
前記連続鋳造の開始から前記スラブ再加熱の開始までの間、前記スラブの表面温度を150℃以上に保持し、
前記スラブ再加熱における前記スラブの表面温度を1080℃以上1200℃以下とすることを特徴とする方向性電磁鋼板の製造方法。 - 前記熱間圧延鋼帯の焼鈍における温度をTa(℃)、前記スラブ再加熱における前記スラブの表面温度をTs(℃)としたとき、「Ts−Ta≦70」の関係が満たされることを特徴とする請求項7に記載の方向性電磁鋼板の製造方法。
- 前記熱間圧延鋼帯の焼鈍時に、温度をTaとする時間を90秒間以内とすることを特徴とする請求項8に記載の方向性電磁鋼板の製造方法。
- 前記熱間圧延鋼帯の焼鈍における温度を980℃以上1180℃とすることを特徴とする請求項7に記載の方向性電磁鋼板の製造方法。
- 前記熱間圧延鋼帯の焼鈍における温度を980℃以上1180℃とすることを特徴とする請求項8に記載の方向性電磁鋼板の製造方法。
- 前記熱間圧延鋼帯の焼鈍における温度を980℃以上1180℃とすることを特徴とする請求項9に記載の方向性電磁鋼板の製造方法。
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PL2418294T3 (pl) | 2020-06-01 |
BRPI1010318A2 (pt) | 2016-03-15 |
BRPI1010318B1 (pt) | 2018-02-06 |
US8202374B2 (en) | 2012-06-19 |
CN102378819B (zh) | 2013-07-24 |
CN102378819A (zh) | 2012-03-14 |
EP2418294A1 (en) | 2012-02-15 |
KR20110134453A (ko) | 2011-12-14 |
JP4673937B2 (ja) | 2011-04-20 |
KR101346537B1 (ko) | 2013-12-31 |
US20120037277A1 (en) | 2012-02-16 |
EP2418294A4 (en) | 2017-10-18 |
WO2010116936A1 (ja) | 2010-10-14 |
RU2471877C1 (ru) | 2013-01-10 |
EP2418294B1 (en) | 2019-12-25 |
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