-
1.
公开(公告)号:US12123066B2
公开(公告)日:2024-10-22
申请号:US16347704
申请日:2017-11-07
发明人: Sea-Woong Lee , Bruno C. De Cooman , Kyoo-Young Lee , Eun-Jung Seo , Seon-Jong Lee , Joo-Hyun Ryu , Won-Hwi Lee
IPC分类号: C21D9/46 , C21D6/00 , C21D8/02 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/38 , C23C2/02 , C23C2/06 , C23C2/28 , C23C2/40
CPC分类号: C21D9/46 , C21D6/002 , C21D6/005 , C21D6/008 , C21D8/0205 , C21D8/0226 , C21D8/0236 , C21D8/0263 , C21D8/0278 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/38 , C23C2/0224 , C23C2/06 , C23C2/28 , C23C2/40 , C21D2211/001 , C21D2211/002 , C21D2211/005 , C21D2211/008
摘要: One aspect of the present invention relates to an ultrahigh-strength steel sheet having an excellent yield ratio, comprising, by wt %, 0.3-0.5% of C, 2.0% (excluding 0%) of Si, 3.0-6.5% of Mn, 0.02% or less of P, 0.01% or less of S, 0.01-3.0% of Al, 0.02% or less (excluding 0%) of N, and the balance of Fe and other inevitable impurities, and a microstructure comprises 5-30% of remaining austenite by area fraction and comprises 5% or less of secondary martensite.
-
公开(公告)号:US20240182996A1
公开(公告)日:2024-06-06
申请号:US18286166
申请日:2022-08-12
申请人: POSCO CO., LTD
发明人: Sea-Woong Lee , Jin-Keun Oh , Seong-Woo Kim , Sang-Heon Kim , Hyo-Sik Chun , Sang-Bin Han
IPC分类号: C21D9/46 , C21D6/00 , C21D8/02 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/22 , C22C38/28 , C22C38/32 , C23C2/02 , C23C2/12 , C23C2/40
CPC分类号: C21D9/46 , C21D6/002 , C21D6/005 , C21D6/008 , C21D8/0205 , C21D8/0226 , C21D8/0236 , C21D8/0263 , C21D8/0278 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/22 , C22C38/28 , C22C38/32 , C23C2/0224 , C23C2/12 , C23C2/40
摘要: The present invention relates to: a steel material for hot forming, used for a vehicle and the like; a hot-formed member; and a method for manufacturing same. In the method, when the formed steel material is skin pass rolled, rolling pressure and roughness of skin pass rolling rolls are controlled so that bendability can be improved.
-
公开(公告)号:US11655517B2
公开(公告)日:2023-05-23
申请号:US16761953
申请日:2018-09-17
申请人: POSCO CO., LTD
发明人: Joo-Hyun Ryu , Kyoo-Young Lee , Sea-Woong Lee
IPC分类号: C23C2/06 , C23C2/40 , C22C38/14 , C22C38/12 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , B32B15/01 , C21D9/46 , C21D8/02 , C21D6/00 , C23C2/28 , C22C38/26 , C22C38/28 , C23C30/00 , B32B15/04 , B32B15/18 , C22C38/18 , C22C38/24 , C23C28/02 , C22C38/42 , C23C2/26 , C22C38/50 , C22C38/20 , C22C38/46 , C22C38/38 , C22C38/44 , C22C38/22 , C22C38/40 , C23C2/12 , C23C28/00 , C22C38/48
CPC分类号: C21D9/46 , B32B15/01 , B32B15/012 , B32B15/013 , B32B15/04 , B32B15/043 , B32B15/18 , C21D6/005 , C21D6/008 , C21D8/0205 , C21D8/0226 , C21D8/0236 , C21D8/0263 , C21D8/0273 , C22C38/001 , C22C38/002 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14 , C22C38/18 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/38 , C22C38/40 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C23C2/06 , C23C2/12 , C23C2/26 , C23C2/28 , C23C2/40 , C23C28/021 , C23C28/023 , C23C28/025 , C23C28/3225 , C23C30/00 , C23C30/005 , C21D2211/001 , C21D2211/004 , C21D2211/008 , Y02P10/20 , Y10T428/12757 , Y10T428/12799 , Y10T428/12951 , Y10T428/12958 , Y10T428/12965 , Y10T428/12972 , Y10T428/12979 , Y10T428/26
摘要: The present invention relates to an automotive steel sheet and, more specifically, provides: an ultrahigh-strength and high-ductility steel sheet ensuring ultrahigh strength and high ductility and, simultaneously, having excellent cold formability due to a high yield strength ratio, and improved collision characteristics.
-
-