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公开(公告)号:US11535908B2
公开(公告)日:2022-12-27
申请号:US16955529
申请日:2018-11-15
申请人: POSCO
发明人: Hyun-Taek Na , Seok-Jong Seo
IPC分类号: C21D9/46 , C22C38/28 , C22C38/26 , C22C38/24 , C22C38/06 , C22C38/02 , C22C38/00 , C21D8/02 , C21D6/00 , C22C38/38 , C21D9/08
摘要: The present invention relates to steel used for a sash component and the like of a vehicle and, more specifically, to a hot-rolled steel sheet having excellent durability and a method for manufacturing same, the hot-rolled steel sheet having no cracks formed on a material and a welding heat-affected zone (HAZ) even after pipemaking and molding due to a smaller decrease in the strength of the welding heat-affected zone formed during electric resistance welding in comparison with the strength of the material (base material).
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公开(公告)号:US10975454B2
公开(公告)日:2021-04-13
申请号:US15781889
申请日:2016-12-07
申请人: POSCO
发明人: Seok-Jong Seo
IPC分类号: C22C38/28 , C22C38/26 , C22C38/24 , C22C38/22 , C22C38/32 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C21D9/46 , C22C38/38 , C21D9/56 , C21D8/02 , C23C2/40 , B32B15/18 , C23C30/00 , C23C2/06 , C23C2/28 , B32B15/04 , C22C38/12 , C22C38/14 , C23C2/02 , C22C38/18 , B32B15/01 , C21D8/04 , C21D6/00
摘要: Provided is an ultra-high strength steel sheet having excellent phosphatability and bendability. The ultra-high strength steel sheet includes, by weight percentage (wt %), carbon (C): 0.08% to 0.2%, silicon (Si): 0.05% to 1.3%, manganese (Mn): 2.0% to 3.0%, phosphorus (P): 0.001% to 0.10%, sulfur (S): 0.010% or less, aluminum (Al): 0.01% to 0.1%, chromium (Cr): 0.3% to 1.2%, boron (B): 0.0010% to 0.0030%, titanium (Ti): 0.01% to 0.05%, nitrogen (N): 0.001% to 0.01%, a remainder of iron (Fe) and other inevitable impurities, satisfying: 3.4≤Ti/N≤10, 1.0≤Mn/(Si+Cr), and 0.7≤Mn*/(Si*+Cr*)≤Mn/(Si+Cr), where Ti, N, Mn, Si and Cr refer to a weight percentage (wt %), and Mn*, Si* and Cr* refer to an average of values obtained by GDS component analysis from a surface to a 0.1 μm position in a thickness direction.
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公开(公告)号:US11466336B2
公开(公告)日:2022-10-11
申请号:US16467762
申请日:2017-11-30
申请人: POSCO
发明人: Seok-Jong Seo , Sung-Il Kim , Hyun-Taek Na
IPC分类号: C21D9/46 , B32B15/01 , C21D6/00 , C21D8/02 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/32 , C23C2/02 , C23C2/06 , C23C2/40
摘要: Provided is a high-strength steel sheet having excellent burring workability in a low temperature range, which is mainly used for automobile chassis parts such as members, lower arms, wheel disks, etc.; and a manufacturing method therefor.
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公开(公告)号:US11203796B2
公开(公告)日:2021-12-21
申请号:US16061514
申请日:2016-11-21
申请人: POSCO
发明人: Sung-Il Kim , Seok-Jong Seo
IPC分类号: C21D9/46 , C21D8/02 , C21D6/00 , C22C38/38 , C22C38/28 , C22C38/26 , C22C38/24 , C22C38/32 , C22C38/22 , C22C38/06 , C22C38/02 , C22C38/00
摘要: Provided is an ultra high strength hot-rolled steel sheet including, in percentage by weight: 0.15-0.25% of C, 0.6-2.0% of Si, 1.5-3.0% of Mn, 0.01-0.1% of Al, 0.01-0.5% of Cr, 0.005-0.2% of Mo, 0.001-0.05% of P, 0.001-0.05% of S, 0.001-0.01% of N, 0.003-0.1% of Nb, 0.003-0.1% of Ti, 0.003-0.1% of V, and the remainder being Fe and other unavoidable impurities, and satisfying following relational expressions (1) and (2). [Relational Expression 1] 4.5≤[Mn]+12[sol.C]+2.5[Mo]+2[Cr]+300[B]+[V]≤5.3. [Relational Expression 2] [sol.C]=[C]−(0.25[Ti]+0.13[Nb]+0.125[Mo]), 0.17≤[sol.C]≤0.22. (In relational expressions 1 and 2, each element symbol represents the content of each element in wt %).
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公开(公告)号:US20210087647A1
公开(公告)日:2021-03-25
申请号:US16956417
申请日:2018-11-15
申请人: POSCO
发明人: Hyun-Taek Na , Seok-Jong Seo
IPC分类号: C21D9/46 , C21D8/02 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/24 , C22C38/26 , C22C38/28 , B23K11/00 , B23K31/02
摘要: The present invention relates to steel used for a sash component and the like of a vehicle and, more specifically, to a hot-rolled steel sheet for a high-strength electric resistance welded steel pipe having excellent expandability and a method for manufacturing same, the hot-rolled steel sheet having a smaller decrease in the strength of a welding heat-affected zone (HAZ) formed during electric resistance welding, in comparison with a base material.
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公开(公告)号:US20230129303A1
公开(公告)日:2023-04-27
申请号:US18085061
申请日:2022-12-20
申请人: POSCO Co., Ltd
发明人: Hyun-Taek Na , Seok-Jong Seo
IPC分类号: C21D9/46 , B23K11/00 , B23K31/02 , C21D8/02 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/24 , C22C38/26 , C22C38/28
摘要: The present invention relates to steel used for a sash component and the like of a vehicle and, more specifically, to a hot-rolled steel sheet for a high-strength electric resistance welded steel pipe having excellent expandability and a method for manufacturing same, the hot-rolled steel sheet having a smaller decrease in the strength of a welding heat-affected zone (HAZ) formed during electric resistance welding, in comparison with a base material.
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公开(公告)号:US11560607B2
公开(公告)日:2023-01-24
申请号:US16956417
申请日:2018-11-15
申请人: POSCO
发明人: Hyun-Taek Na , Seok-Jong Seo
IPC分类号: C21D9/46 , B23K11/00 , B23K31/02 , C21D8/02 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/24 , C22C38/26 , C22C38/28 , B23K103/04 , B23K101/06
摘要: The present invention relates to steel used for a sash component and the like of a vehicle and, more specifically, to a hot-rolled steel sheet for a high-strength electric resistance welded steel pipe having excellent expandability and a method for manufacturing same, the hot-rolled steel sheet having a smaller decrease in the strength of a welding heat-affected zone (HAZ) formed during electric resistance welding, in comparison with a base material.
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公开(公告)号:US11535907B2
公开(公告)日:2022-12-27
申请号:US16467792
申请日:2017-11-29
申请人: POSCO
发明人: Seok-Jong Seo , Hyun-Taek Na
IPC分类号: C21D9/46 , B21B3/02 , B21B37/74 , C21D6/00 , C21D8/02 , C22C38/00 , C22C38/02 , C22C38/06 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/38
摘要: Provided is a steel used for chassis parts, etc. of an automobile and, more specifically, to a hot rolled steel plate for an electric resistance welded steel pipe, which shows an excellent weldability in electric resistance welding, and a manufacturing method thereof.
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