发明名称 |
HIGH-STRENGTH COLD-ROLLED STEEL SHEET WITH EXCELLENT LOCAL FORMABILITY, AND MANUFACTURING METHOD THEREFOR |
摘要 |
This high-strength hot-rolled steel sheet having excellent local deformability contains, in mass%, C: 0.07% to 0.20%; Si: 0.001% to 2.5%; Mn: 0.01% to 4.0%; P: 0.001% to 0.15%; S: 0.0005% to 0.03%; Al: 0.001% to 2.0%; N: 0.0005% to 0.01%; and O: 0.0005% to 0.01%; and a balance being composed of iron and inevitable impurities, in which an area ratio of bainite in a metal structure is 95% or more, at a sheet thickness center portion being a range of 5/8 to 3/8 in sheet thickness from the surface of the steel sheet, an average value of pole densities of the {100}<011> to {223}<110> orientation group is 4.0 or less, and a pole density of the {332}<113> crystal orientation is 5.0 or less, and a mean volume diameter of crystal grains in the metal structure is 10 µm or less. |
申请公布号 |
EP2698440(A1) |
申请公布日期 |
2014.02.19 |
申请号 |
EP20120770870 |
申请日期 |
2012.04.12 |
申请人 |
NIPPON STEEL & SUMITOMO METAL CORPORATION |
发明人 |
SUWA, YOSHIHIRO;NAKANO, KAZUAKI;HAYASHI, KUNIO;OKAMOTO, RIKI;FUJITA, NOBUHIRO;SANO, KOHICHI |
分类号 |
B32B15/01;C21D8/02;C21D8/04;C21D9/46;C22C38/00;C22C38/02;C22C38/04;C22C38/06;C22C38/08;C22C38/10;C22C38/12;C22C38/14;C22C38/16;C22C38/22;C22C38/26;C22C38/28;C22C38/38;C22C38/58 |
主分类号 |
B32B15/01 |
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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