| 发明名称 |
HIGH-STRENGTH HOT-ROLLED STEEL SHEET AND METHOD FOR PRODUCING SAME |
| 摘要 |
A high-strength hot-rolled steel sheet including a chemical composition containing, in percent by mass, 0.05% to 0.12% of C, 0.05% to 1.0% of Si, 0.5% to 1.8% of Mn, 0.04% or less of P, 0.0030% or less of S, 0.005% to 0.07% of Al, 0.006% or less of N, 0.05% to 0.15% of Ti, and the balance being Fe and incidental impurities, in which, in a region in the range of ⅛ to ⅜ of the sheet thickness, the content of Ti*, which is Ti existing as precipitates, is 0.3×[Ti] to 0.6×[Ti], where [Ti] is the Ti content, and the steel sheet has a microstructure in which the area fraction of the bainite phase in the entire structure is more than 95%. |
| 申请公布号 |
US2014338801(A1) |
申请公布日期 |
2014.11.20 |
| 申请号 |
US201214370330 |
申请日期 |
2012.12.26 |
| 申请人 |
JFE STEEL CORPORATION |
发明人 |
Nakajima Katsumi;Saito Hayato;Funakawa Yoshimasa |
| 分类号 |
C22C38/28;C22C38/16;C22C38/14;C22C38/00;C22C38/08;C22C38/06;C22C38/04;C22C38/02;C21D8/02;C22C38/12 |
主分类号 |
C22C38/28 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. A high-strength hot-rolled steel sheet including a chemical composition comprising, in percent by mass, 0.05% to 0.12% of C, 0.05% to 1.0% of Si, 0.5% to 1.8% of Mn, 0.04% or less of P, 0.0030% or less of S, 0.005% to 0.07% of Al, 0.006% or less of N, 0.05% to 0.15% of Ti, and the balance being Fe and incidental impurities, wherein, in a region in the range of ⅛ to ⅜ of the sheet thickness, the content of Ti*, which is Ti existing as precipitates, is 0.3×[Ti] to 0.6×[Ti], where [Ti] is the Ti content, and the steel sheet has a microstructure in which the area fraction of the bainite phase in the entire structure is more than 95%. |
| 地址 |
Chiyoda-ku, Tokyo JP |
