JP4804478B2 - 磁束密度を向上させた無方向性電磁鋼板の製造方法 - Google Patents
磁束密度を向上させた無方向性電磁鋼板の製造方法 Download PDFInfo
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Description
前記目的を達成するために,本発明者らは,合金元素が磁性に及ぼす種類別影響,相変態に及ぼす影響,及び熱間圧延条件が磁性に及ぼす影響を,それぞれ調査検討した結果,合金元素の内,C,Si,Mn,Alが磁性と相変態に大きく影響を及ぼしており,また,熱間圧延が行われる相(オーステナイト,フェライト,又はオーステナイトとフェライトの二相域),熱間仕上げ圧延開始温度,終了温度,及び最終パス圧下率等が磁性に大きな影響を及ぼすことが判明した。
前記再加熱されたスラブを,オーステナイトとフェライトの二相域において,全体の熱間仕上げ圧延圧下率の70%以上に圧延を行った後,フェライト単相域において,全体圧下率の30%未満に圧延を行い,最終パス圧下率が{20−(960−仕上げ圧延終了温度)/20}%未満となるようにする熱間圧延段階と,
前記熱延された鋼板を650〜800℃の温度で巻き取る段階と,
前記巻き取られた板を所定の厚さに冷間圧延する段階と,
前記冷間圧延された鋼板を最終焼鈍する段階と,で構成されることを特徴とする磁性に優れた熱延板焼鈍省略型無方向性電磁鋼板の製造方法を提供する。
前記Cは,最終製品において磁気時効を引き起こし,使用中に磁気的特性を低下させるため,一般にCの含量が低いほど磁気的特性には好ましいことが知られている。したがって,鋼を精練する段階で,その量を減らし,スラブでは0.005重量%以下に含有させることにより,磁性が向上する。0.005重量%以上にスラブに含有させる場合,熱延板又は最終焼鈍前に脱炭焼鈍を行わなければならず,その場合,湿潤雰囲気を用いるようになり,したがって,表面に酸化層の発生により磁性が低下するため,スラブでは,0.005重量%以下にする。最終製品では,できれば,0.003重量%以下に含有させることで磁気時効を抑制することができる。
前記Siは,比抵抗を増加させ,鉄損中,渦電流損を低める成分であるが,3.0重量%以上添加されると,冷間圧延が困難となり,相変態を引き起こさないフェライト単相域を有する鋼となるため,3.0重量%に制限することが好ましい。
前記Mnは,オーステナイト形成元素として,比抵抗を増加させるだけでなく,集合組織を向上させる成分であって,2.0重量%を超えて添加されると,磁性向上の効果が飽和するため,その含量を0.1〜2.0重量%に制限することが好ましい。
前記Pは,比抵抗を増加させ,結晶粒系に偏析し,集合組織を発達させる元素であって,熱延板焼鈍を行う場合,その効果を示すためには,少なくとも0.01重量%以上が添加されなければならず,多く添加されると,冷間圧延が困難となり,偏析が増加し,磁性が低下するため,その含量を0.1重量%以下に制限することが好ましい。熱延板焼鈍を行わない場合,Pが結晶粒系に均一に分布しないため,上述した効果が得られず,結晶粒成長に妨害となるので,最小化することが好ましい。
前記Alは,フェライト形成元素として,比抵抗を増加させ,渦電流損を低めるのに有効な成分であって,0.1重量%未満添加されると,その添加効果がなく,1.5重量%を超えて添加されると,添加量に比べて,磁性向上の程度が劣り,冷間圧延性も劣るため,その含量を0.1〜1.5重量%に制限することが好ましい。Alは,フェライト形成元素であるので,適正相変態が生じる鋼を設計するためには,Mn含量を考慮して添加する。また,Alを0.2重量%以上1.0重量%以下に添加するとき,その効果はさらに大きくなる。これは,Alの添加により酸素の影響が大きく減少し,微細に析出されるAlNを粗大なAlNの析出物に形成させるからである。
前記Mnが−0.2よりも小さいと,オーステナイト域が小さくなり過ぎるため,適正二相域が作られず,mが1.0以上であれば,オーステナイト域が大きくなり過ぎるため,適正Ar1温度を有するSiの含量が高くなり過ぎる。したがって,mは,−0.2〜1.0に限定する。
前記Sb及びSnは,結晶粒系に偏析し,磁性に不利な{222}集合組織を抑制する元素であって,鋼板の表面を濃縮することにより,鋼が窒化することを抑制する。したがって,微細な結晶粒形成を抑制し,均一な結晶粒を形成させる。これらの元素は,0.007重量%以下含有すると,その効果が劣り,0.15重量%以上含有すると,結晶粒成長を抑制するだけでなく,冷間圧延が困難となり,磁性向上の程度が劣るため,0.007〜0.15%に制限することが好ましい。
前記Sは,微細な析出物であるMnSを形成して磁気特性を劣化させるため,できるだけ低く管理することが有利であり,0.003重量%を超えて含有されると,磁気特性が極めて劣化するため,その含量を0.003重量%以下に制限することが好ましい。
前記Nは,微細かつ長いAlN析出物を形成させ,Nbと結合してNbNの微細な析出物を作るため,できるだけ少なく含有させ,本発明では,0.003重量%以下に制限することが好ましい。
前記Nbは,微細なNbN析出物を形成させ,結晶粒の成長を抑制し,磁性に不利な{222}面の集合組織を発達させるため,0.002重量%以下に制限する。また,Cと結合して微細な炭化物を作るため,スラブにおいてCは,できるだけ減少させることが必要である。このようなNbは,添加量の影響が極めて大きいため,0.002重量%以下に含有させることが,磁気的特性の向上に好ましい。
前記Tiは,TiC,TiNの微細な析出物を形成して結晶粒の成長を抑制し,鋼板の磁気的特性に不利な{222}面の集合組織を発達させるため,0.002重量%以下に制限する。
Claims (6)
- 重量%で,C:0.005%以下,Si:1.0〜3.0%,Mn:0.1〜2.0%,P:0.1%以下,Al:0.1〜1.5%,残部Fe及び不可避的不純物を含み,前記MnとAlは,−0.2<Mn−Al<1.0の範囲からなるスラブをAr1〜1250℃の温度で再加熱する段階と,
前記再加熱されたスラブを,オーステナイトとフェライトの二相域において,全体の熱間仕上げ圧延圧下率の70%以上を行い,残りはフェライト単相域に行い,最終パス圧下率が{20−(960−仕上げ圧延終了温度)/20}%未満となるようにする熱間圧延段階と,
前記熱間圧延された鋼板を650〜800℃の温度で巻き取る段階と,
前記巻き取られた熱延鋼板を所定の厚さに冷間圧延する段階と,
前記冷延鋼板を最終焼鈍する段階と,で構成されることを特徴とする無方向性電磁鋼板の製造方法。 - 前記スラブは,Sb,Snの中から選ばれた1種以上の元素が0.007〜0.15%さらに添加されていることを特徴とする請求項1記載の無方向性電磁鋼板の製造方法。
- 前記鋼板中に含まれている不純物は,S:0.003%以下,N:0.003%以下,Nb:0.002%以下,Ti:0.002%以下であることを特徴とする請求項1記載の無方向性電磁鋼板の製造方法。
- 前記最終焼鈍段階は,1秒当たり10〜40℃の昇温速度で行われることを特徴とする請求項1記載の無方向性電磁鋼板の製造方法。
- 前記スラブのAr1温度は,960〜1060℃であることを特徴とする請求項1〜4いずれか1項記載の無方向性電磁鋼板の製造方法。
- 前記熱間仕上げ圧延の開始温度は,Ar1+50℃以上であり,終了温度は,Ar1−80℃以上であることを特徴とする請求項1〜4いずれか1項記載の無方向性電磁鋼板の製造方法。
Applications Claiming Priority (11)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020040109644A KR101130725B1 (ko) | 2004-12-21 | 2004-12-21 | 자기적 특성이 우수한 무방향성 전기강판 및 그 제조방법 |
| KR10-2004-0109644 | 2004-12-21 | ||
| KR10-2005-0125220 | 2005-12-19 | ||
| KR1020050125222A KR100721926B1 (ko) | 2005-12-19 | 2005-12-19 | 자기적 특성이 우수한 무방향성 전기강판 및 그 제조방법 |
| KR1020050125221A KR100721818B1 (ko) | 2005-12-19 | 2005-12-19 | 자기적 특성이 우수한 무방향성 전기강판 및 그 제조방법 |
| KR10-2005-0125223 | 2005-12-19 | ||
| KR10-2005-0125222 | 2005-12-19 | ||
| KR1020050125220A KR100721864B1 (ko) | 2005-12-19 | 2005-12-19 | 자기적 특성이 우수한 무방향성 전기강판의 제조방법 |
| KR1020050125223A KR100721865B1 (ko) | 2005-12-19 | 2005-12-19 | 자기적 특성이 우수한 무방향성 전기강판 및 그 제조방법 |
| KR10-2005-0125221 | 2005-12-19 | ||
| PCT/KR2005/004400 WO2006068399A1 (en) | 2004-12-21 | 2005-12-20 | Non-oriented electrical steel sheets with excellent magnetic properties and method for manufacturing the same |
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| JP2008524449A JP2008524449A (ja) | 2008-07-10 |
| JP4804478B2 true JP4804478B2 (ja) | 2011-11-02 |
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| CN101654757B (zh) * | 2008-08-20 | 2012-09-19 | 宝山钢铁股份有限公司 | 涂层半工艺无取向电工钢板及制造方法 |
| BR112012010174B1 (pt) | 2009-10-28 | 2022-09-20 | Nippon Steel Corporation | Chapa metálica à base de fe e método de produção da mesma |
| US20120267015A1 (en) * | 2009-12-28 | 2012-10-25 | Posco | Non-Oriented Electrical Steel Sheet Having Superior Magnetic Properties and a Production Method Therefor |
| CN102443734B (zh) * | 2010-09-30 | 2013-06-19 | 宝山钢铁股份有限公司 | 无瓦楞状缺陷的无取向电工钢板及其制造方法 |
| JP5605518B2 (ja) * | 2011-11-11 | 2014-10-15 | 新日鐵住金株式会社 | 無方向性電磁鋼板およびその製造方法 |
| PL2612942T3 (pl) | 2012-01-05 | 2015-03-31 | Thyssenkrupp Steel Europe Ag | Elektrotechniczna stalowa taśma lub blacha o ziarnie niezorientowanym, element wytwarzany z niej i sposób wytwarzania elektrotechnicznej stalowej taśmy lub blachy o ziarnie niezorientowanym |
| CN103290190A (zh) * | 2012-03-02 | 2013-09-11 | 宝山钢铁股份有限公司 | 无取向硅钢及其制造方法 |
| CN103305748A (zh) * | 2012-03-15 | 2013-09-18 | 宝山钢铁股份有限公司 | 一种无取向电工钢板及其制造方法 |
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| EP1580289B1 (en) * | 2002-12-05 | 2015-02-11 | JFE Steel Corporation | Non-oriented magnetic steel sheet and method for production thereof |
| CN1258610C (zh) * | 2003-05-12 | 2006-06-07 | 宝山钢铁股份有限公司 | 无瓦楞状缺陷的无取向电工钢板及其制造方法 |
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- 2005-12-20 WO PCT/KR2005/004400 patent/WO2006068399A1/en not_active Ceased
- 2005-12-20 CN CNB2005800440091A patent/CN100529115C/zh not_active Expired - Fee Related
- 2005-12-20 EP EP05821875A patent/EP1838882A4/en not_active Withdrawn
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| WO2006068399A1 (en) | 2006-06-29 |
| JP2008524449A (ja) | 2008-07-10 |
| US20080121314A1 (en) | 2008-05-29 |
| US7846271B2 (en) | 2010-12-07 |
| EP1838882A4 (en) | 2011-03-02 |
| CN101084322A (zh) | 2007-12-05 |
| EP1838882A1 (en) | 2007-10-03 |
| CN100529115C (zh) | 2009-08-19 |
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