| 发明名称 |
HIGH-STRENGTH STEEL SHEET AND PROCESS FOR PRODUCING SAME |
| 摘要 |
A high-strength steel sheet contains, by mass %, C: 0.12% to 0.40%, Si: 0% to 0.6%, Mn: more than 0% to 1.5%, Al: more than 0% to 0.15%, N: more than 0% to 0.01%, P: more than 0% to 0.02%, S: more than 0% to 0.01%, and has a martensite single-phase structure, wherein a region having a KAM value (Kernel Average Misorientation value) of 1° or more occupies 50% or more, and a maximum residual tensile stress in a surface layer region from a surface to a position at a depth of ¼ the sheet thickness is 80 MPa or less. As a result, the high-strength steel sheet excels in the resistance to delayed fracture of the cut end surface and the steel sheet base material. |
| 申请公布号 |
US2016369367(A1) |
申请公布日期 |
2016.12.22 |
| 申请号 |
US201415111302 |
申请日期 |
2014.12.26 |
| 申请人 |
KABUSHIKI KAISHA KOBE SEIKO SHO (KOBE STEEL, LTD.) |
发明人 |
SHIRAKI Atsuhiro;UTSUMI Yukihiro |
| 分类号 |
C21D9/46;C25D5/36;C23C2/06;C23C2/02;C23C2/40;C22C38/54;C22C38/50;C22C38/48;C22C38/46;C22C38/42;C22C38/32;C22C38/28;C22C38/26;C22C38/24;C22C38/20;C22C38/16;C22C38/14;C22C38/12;C22C38/08;C22C38/06;C22C38/04;C22C38/02;C22C38/00;C23G1/00;C21D8/02;B32B15/01;C25D3/22 |
主分类号 |
C21D9/46 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. A high-strength steel sheet comprising, by mass %,
C: 0.12% to 0.40%, Si: 0% to 0.6%, Mn: more than 0% to 1.5%, Al: more than 0% to 0.15%, N: more than 0% to 0.01%, P: more than 0% to 0.02%, S: more than 0% to 0.01%,and having a martensite single-phase structure, wherein
a region having a KAM value (Kernel Average Misorientation value) of 1° or more occupies 50% or more, and a maximum residual tensile stress in a surface layer region from a surface to a position at a depth of ¼ the sheet thickness is 80 MPa or less. |
| 地址 |
Kobe-shi JP |
