发明名称 |
HIGH-STRENGTH COLD-ROLLED STEEL SHEET HAVING SMALL VARIATIONS IN STRENGTH AND DUCTILITY, AND METHOD FOR PRODUCING SAME |
摘要 |
A high-strength cold-rolled steel sheet has a chemical composition including C of 0.05% to 0.30%, Si of greater than 0% to 3.0%, Mn of 0.1% to 5.0%, P of greater than 0% to 0.1%, S of greater than 0% to 0.02%, Al of 0.01% to 1.0%, and N of greater than 0% to 0.01%, in mass percent, with the remainder including iron and inevitable impurities. The steel sheet has a microstructure containing ferrite as a soft primary phase in an area percentage of 20% to 50% with the remainder including tempered martensite and/or tempered bainite as a hard secondary phase. The ferrite grains are adapted to contain cementite particles having an appropriate size in an appropriate number density. |
申请公布号 |
EP2792760(A1) |
申请公布日期 |
2014.10.22 |
申请号 |
EP20120856626 |
申请日期 |
2012.12.11 |
申请人 |
KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.) |
发明人 |
MASUDA TOMOKAZU;HATA HIDEO;KAJIHARA KATSURA;MURAKAMI TOSHIO;MIURA MASAAKI;IKEDA MUNEAKI |
分类号 |
C22C38/00;B21B3/00;C21D9/46;C22C38/06;C22C38/58 |
主分类号 |
C22C38/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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