发明申请
- 专利标题： Ultra Fine-Grained Advanced High Strength Steel Sheet Having Superior Formability
- 专利标题（中）： 超细晶高级高强度钢板具有优异的成型性
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申请号： US13747451申请日： 2013-01-22
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公开(公告)号： US20140205488A1公开(公告)日： 2014-07-24
- 发明人: Hyun Jo Jun , Narayan Subramaniam Pottore , Nina Michailovna Ponstein , Oleg N. Yakubovsky
- 申请人： Hyun Jo Jun , Narayan Subramaniam Pottore , Nina Michailovna Ponstein , Oleg N. Yakubovsky
- 主分类号： C22C38/14
- IPC分类号： C22C38/14 ; C22C38/08 ; C22C38/00 ; C22C38/04 ; C22C38/02 ; C22C38/12 ; C22C38/06
摘要：
A cold rolled, annealed TRIP steel sheet which has a composition including (in wt. %): C: 0.1-0.3; Mn: 4-10, Al: 0.05-5, Si: 0.05-5; and Nb: 0.008-0.1, the remainder being iron and inevitable residuals. The cold rolled sheet has an ultimate tensile strength of at least 1000 MPa, and a total elongation of at least 15%. The cold rolled sheet may have at least 20% retained austenite in its microstructure and may have greater than 50% lath-type annealed ferrite structure. The cold rolled sheet may have an ultra fine grain size of less than 5 micron for the retained austenite and ferrite.