发明名称 |
HIGH-STRENGTH STEEL SHEET AND METHOD FOR PRODUCING THE SAME |
摘要 |
There is provided a high-strength steel sheet having a tensile strength (TS) of 900 MPa or more and excellent elongation, stretch flangeability, and bendability in a component system in which an expensive alloy element is not intentionally added. A high-strength steel sheet includes a composition including, on a mass % basis, C: 0.15 to 0.40%, Si: 1.0 to 2.0%, Mn: 1.5 to 2.5%, P: 0.020% or less, S: 0.0040% or less, Al: 0.01 to 0.1%, N: 0.01% or less, and Ca: 0.0020% or less, with the balance including Fe and incidental impurities. The high-strength steel sheet has a microstructure including 40% to 70% of a ferrite phase and a bainite phase in total, 20% to 50% of a martensite phase, and 10% to 30% of a retained austenite phase in terms of an area fraction relative to the entire microstructure. |
申请公布号 |
US2016083819(A1) |
申请公布日期 |
2016.03.24 |
申请号 |
US201414779783 |
申请日期 |
2014.03.26 |
申请人 |
JFE STEEL CORPORATION |
发明人 |
Kawabe Hidetaka;Yokota Takeshi;Sugihara Reiko;Tahara Kazunori |
分类号 |
C22C38/06;C22C38/02;C22C38/00;C21D9/46;C25D3/22;C25D7/00;C21D6/00;C21D8/02;C22C38/04;C25D5/36 |
主分类号 |
C22C38/06 |
代理机构 |
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代理人 |
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主权项 |
1. A high-strength steel sheet comprising a composition including, on a mass % basis:
C: 0.15 to 0.40%, Si: 1.0 to 2.0%, Mn: 1.5 to 2.5%, P: 0.020% or less, S: 0.0040% or less, Al: 0.01 to 0.1%, N: 0.01% or less, and Ca: 0.0020% or less, with the balance comprising Fe and incidental impurities, wherein the high-strength steel sheet has a microstructure including 40% to 70% of a ferrite phase and a bainite phase in total, 20% to 50% of a martensite phase, and 10% to 30% of a retained austenite phase in terms of an area fraction relative to the entire microstructure. |
地址 |
Tokyo JP |