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公开(公告)号:US11591664B2
公开(公告)日:2023-02-28
申请号:US16470808
申请日:2017-12-12
申请人: POSCO
发明人: Tae-Jin Song , Jeong-Eun Kim , Chang-Sik Choi
摘要: Provided is a hot rolled steel sheet having excellent formability and fatigue properties comprising, in percentage by weight: 0.3-0.8% of C; 13-25% of Mn; 0.1-1.0% of V; 0.005-2.0% of Si; 0.01-2.5% of Al; 0.03% or less of P; 0.03% or less of S; 0.04% or less (excluding 0%) of N; and the balance being Fe and inevitable impurities, wherein, when viewed in a cross section in the thickness direction, the hot rolled steel sheet comprises, by area fraction, 20-70% of a non-recrystallized structure and 30-80% of a recrystallized structure.
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公开(公告)号:US11584973B2
公开(公告)日:2023-02-21
申请号:US16642630
申请日:2018-09-13
申请人: POSCO
发明人: Doo-Jin Paik , Seul-Ki Park , Chung-Won Kim , Jung-Ki Kim , Sung-Il Kim , Hyeon-Seok Hwang , Je-Woong Lee , Jeong-Eun Kim , Cho-Rong Hong
IPC分类号: C23C2/02 , C23C2/06 , C23C2/12 , C23C2/40 , C23C16/06 , B32B15/01 , C22C38/14 , C22C38/12 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C21D6/00 , C21D8/02 , C21D9/46 , C21D1/26 , C25D3/22 , C25D3/44 , C25D5/36 , C25D7/06 , C23C30/00 , B32B15/18 , B32B15/04
摘要: Provided is a steel sheet having excellent image clarity after painting, including: carbon (C): 0.001% to 0.03%, silicon (Si): 0.001% to 0.35%, manganese (Mn): 0.05% to 2.2%, phosphorus (P): 0.003% to 0.1%, sulfur (S): 0.001% or 0.025%, aluminum (Al): 0.01% to 0.1%, nitrogen (N): 0.001% to 0.007%, and a remainder of iron (Fe) and inevitable impurities. The microstructure of the steel sheet mainly is ferrite phases. An R-cube texture of a surface layer of the steel sheet is 5% or less by area %.
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