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公开(公告)号:US20220410303A1
公开(公告)日:2022-12-29
申请号:US17780180
申请日:2020-11-25
申请人: POSCO
发明人: Young-Ha Kim , Chang-Sik Choi , Ki-Hyun Park
摘要: An aspect of the present disclosure is to provide a method for manufacturing a welded structure capable of effectively suppressing welding LME cracks generated during spot welding of a zinc plated steel sheet having ultra-high strength, and a welded structure manufactured using the same.
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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:US11034132B2
公开(公告)日:2021-06-15
申请号:US16470781
申请日:2017-12-21
申请人: POSCO
发明人: Young-Ha Kim , Chang-Sik Choi , Yon-Kyun Song , Kwang-Tai Min
IPC分类号: B32B15/01 , C22C21/06 , C22C38/00 , C22C38/04 , C22C38/14 , C23C2/12 , C23C2/20 , C23C2/28 , C23C2/40 , C22C21/00
摘要: Provided are a high manganese hot dip aluminum-plated steel sheet and a method for manufacturing the same, the steel sheet including: a base steel comprising, by wt %, 0.3-0.9% of C, 10-25% of Mn, 0.01-0.5% of Ti, 0.01-0.2% of Sn, 0.01-0.1% of Sb, and the balance of Fe and inevitable impurities; a hot dip aluminum-based steel plated layer formed on the base steel sheet and comprising 0.1 wt % or more of a sum of one or more types among Li, Na, and K, and the balance of Al and inevitable impurities; and an Al—Fe—Si—Mn based alloy layer formed between the base steel sheet and the aluminum-based plated layer, and having a dual structure with different average Fe amounts.
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