JP6062051B2 - 高磁束密度方向性珪素鋼及びその製造方法 - Google Patents
高磁束密度方向性珪素鋼及びその製造方法 Download PDFInfo
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Description
その後、そのスラブを特別な高温加熱炉内で約1400℃まで加熱し、45分間以上保温して好ましい介在物を充分に固溶させ、
その後、熱間圧延を施し、ラミナー冷却後に巻き取りを行い、熱延板の焼準工程で珪素鋼の母相中に第二相粒子を析出させて微細分散させることにより有効なインヒビターを得、
さらにその熱延板に冷間圧延を施して最終製品の厚さとした後、脱炭焼鈍を行って、上記鋼板中のCを最終製品の磁気特性に影響がでない程度除去し(通常、30ppm以下とすべきである)、MgOを主成分とする焼鈍分離剤を塗布し、
再び高温焼鈍を行って、高温焼鈍工程で鋼板を二次再結晶させて、珪酸マグネシウム底層を形成させることにより純化処理(鋼中のS、N等の磁気特性に有害な元素の除去)を完了させて、配向性が高く、鉄損が低い高磁束密度方向性珪素鋼を得、
最後に、絶縁コーティングを塗布し、延伸焼鈍を行うことにより、商業用途の形態の方向性珪素鋼製品を得る。
(1)製錬及び鋳造を行ってスラブを得る工程と、
(2)熱間圧延工程と、
(3)焼準焼鈍工程と、
(4)冷間圧延工程と、
(5)脱炭温度がT(x1,x2)=ax1+bx2+c(式中、x1はSb+Bi+Nb+Moの重量%含量(単位ppm)、x2は(Sb+Bi+Nb+Mo)/(V+Ti)のモル分率比(単位l)、aは0.1〜1.0の範囲の値、bは0.1〜1.0の範囲の値、cは800〜900℃の範囲の値であって微量元素を添加しない場合の脱炭温度を表す)を満たし、脱炭時間が80〜160秒である脱炭焼鈍工程と、
(6)窒化処理工程と、
(7)鋼板にMgOコーティングを施してから高温焼鈍を行う工程と、
(8)絶縁コーティングを施し、熱延伸平坦化焼鈍を行うことにより、高磁束密度方向性珪素鋼を得る工程と
を含む方法を提供する。
(1)表1に示される成分組成に従って製錬及び鋳造を行ってスラブを得る工程。
(2)スラブを1150℃の温度で加熱してから熱間圧延を行って、厚さ2.3mmの熱延板を得る工程。
(3)焼準焼鈍工程。
(4)冷間圧延を行って、最終製品の厚さである0.30mmとする工程。
(5)脱炭温度が関係式:T=0.21x1+0.16x2+831を満たし、脱炭時間が80〜160秒である条件下、脱炭を行って、鋼板中のC含量を30ppm以下に減少させる工程。
(6)N浸透量が100〜160ppmである窒化処理工程。
(7)鋼板にMgOコーティングを施してから、100%H2雰囲気、温度1200℃の条件下、高温焼鈍を20時間行う工程。
(8)巻き解いてから絶縁コーティングを施し、熱延伸平坦化焼鈍を行うことにより、高磁束密度方向性珪素鋼を得る工程。
Claims (7)
- 高磁束密度方向性珪素鋼であって、
該方向性珪素鋼のスラブが、重量%で、C:0.035〜0.120%、Si:2.9〜4.5%、Mn:0.05〜0.20%、P:0.005〜0.050%、S:0.005〜0.012%、Als:0.015〜0.035%、N:0.001〜0.010%、Cr:0.05〜0.30%、Sn:0.005〜0.090%、V≦0.0100%、Ti≦0.0100%、微量元素Sb、Bi、Nb及びMoのうち少なくとも1つ:Sb+Bi+Nb+Mo=0.0015〜0.0250%を含有し、残部としてFe及び不可避的不純物を含有し、かつ、(Sb/121.8+Bi/209.0+Nb/92.9+Mo/95.9)/(Ti/47.9+V/50.9)の値が0.1〜15であり、
該方向性珪素鋼は、磁束密度B8が1.93Tよりも高い高磁束密度方向性珪素鋼。 - 請求項1に記載の高磁束密度方向性珪素鋼を製造する方法であって、
(1)製錬及び鋳造を行って前記スラブを得る工程と、
(2)熱間圧延工程と、
(3)焼準焼鈍工程と、
(4)冷間圧延工程と、
(5)脱炭温度がT(x1,x2)=ax1+bx2+c(式中、x1はSb+Bi+Nb+Moの重量%含量(単位ppm)、x2は(Sb+Bi+Nb+Mo)/(V+Ti)のモル分率比、aは0.1〜1.0の範囲の値、bは0.1〜1.0の範囲の値、cは800〜900℃の範囲の値)を満たし、脱炭時間が80〜160秒である脱炭焼鈍工程と、
(6)窒化処理工程と、
(7)鋼板にMgOコーティングを施してから高温焼鈍を行う工程と、
(8)絶縁コーティングを施し、熱延伸平坦化焼鈍を行うことにより、高磁束密度方向性珪素鋼を得る工程と
を含むことを特徴とする方法。 - 一次粒径Φが30μm以下、一次再結晶率Pが90%以上となるように前記脱炭温度を制御することを特徴とする請求項2に記載の高磁束密度方向性珪素鋼を製造する方法。
- (9)磁区細分化工程
をさらに含むことを特徴とする請求項2又は3に記載の高磁束密度方向性珪素鋼を製造する方法。 - 前記工程(2)において、加熱温度が1250℃以下であることを特徴とする請求項2又は3に記載の高磁束密度方向性珪素鋼を製造する方法。
- 前記工程(4)において、冷間圧延の圧下率が75%以上であることを特徴とする請求項2又は3に記載の高磁束密度方向性珪素鋼を製造する方法。
- 前記工程(6)において、窒素の浸透量が50〜260ppmであることを特徴とする請求項2又は3に記載の高磁束密度方向性珪素鋼を製造する方法。
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210315658.2A CN102787276B (zh) | 2012-08-30 | 2012-08-30 | 一种高磁感取向硅钢及其制造方法 |
| CN201210315658.2 | 2012-08-30 | ||
| PCT/CN2012/001683 WO2014032216A1 (zh) | 2012-08-30 | 2012-12-11 | 一种高磁感取向硅钢及其制造方法 |
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| US (1) | US10236105B2 (ja) |
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| CN102787276B (zh) | 2012-08-30 | 2014-04-30 | 宝山钢铁股份有限公司 | 一种高磁感取向硅钢及其制造方法 |
| CN103695619B (zh) * | 2012-09-27 | 2016-02-24 | 宝山钢铁股份有限公司 | 一种高磁感普通取向硅钢的制造方法 |
| CN103540846B (zh) * | 2013-08-27 | 2016-01-20 | 国家电网公司 | 一种薄规格、超低铁损、低噪声高磁感取向硅钢片及其制备方法 |
| CN103668005B (zh) * | 2013-12-12 | 2015-10-14 | 武汉钢铁(集团)公司 | 一种用中温板坯加热温度生产的HiB钢及其生产方法 |
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| US20150206633A1 (en) | 2015-07-23 |
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