发明名称 |
DUAL PHASE STEEL SHEET WITH GOOD BAKE-HARDENING PROPERTIES |
摘要 |
A dual phase steel sheet with good bake-hardening properties is provided. The steel sheet is characterized in containing (in terms of percent by mass) C: no less than 0.06% and less than 0.25%; Si+Al: 0.5 to 3%; Mn: 0.5 to 3%; P: no more than 0.15%; and S: no more than 0.02%; and also meeting the following condition (in terms of space factor) that retained austenite is at least 3%, bainite is at least 30%, and ferrite is no more than 50%, and further characterized in differing in stress larger than 50 MPa before and after application of 2% pre-strain and ensuing heat treatment for paint baking at 170° C. for 20 minutes. The steel sheet has well-balanced strength and workability, exhibits good bake-hardening properties at the time of paint baking, and offers good resistance to natural aging.
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申请公布号 |
US2009242085(A1) |
申请公布日期 |
2009.10.01 |
申请号 |
US20090477299 |
申请日期 |
2009.06.03 |
申请人 |
KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD) |
发明人 |
IKEDA SHUSHI;MAKII KOICHI;AKAMIZU HIROSHI |
分类号 |
C21D8/02;C21D1/20;C21D9/46;C22C38/00;C22C38/02;C22C38/04;C22C38/06;C22C38/58 |
主分类号 |
C21D8/02 |
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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