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公开(公告)号：US20230235423A1
公开(公告)日：2023-07-27
申请号：US18114387
申请日：2023-02-27
申请人： POSCO Co., Ltd
发明人： Jin-Keun OH , Yeol-Rae CHO , A-Ra CHO , Jin-Ho CHA , Si-Myoung HEO , Jeong-Won SEO , Seong-Woo KIM
IPC分类号： C21D9/46 , B21B3/02 , B21D22/02 , C21D6/00 , C21D8/02 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/50 , C22C38/54
CPC分类号： C21D9/46 , B21B3/02 , B21D22/022 , C21D6/004 , C21D6/005 , C21D6/008 , C21D8/0205 , C21D8/0226 , C21D8/0236 , C21D8/0247 , C22C38/001 , C22C38/002 , C22C38/008 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/50 , C22C38/54 , C21D2211/003 , C21D2211/005
摘要： An aspect of the present invention relates to a cold-rolled steel plate for hot forming, which is excellent in corrosion-resistance and spot-weldability, contains, by weight %, C: 0.1-0.4%, Si: 0.5-2.0%, Mn: 0.01-4.0%, Al: 0.001-0.4%, P: 0.001-0.05%, S: 0.0001-0.02%, Cr: 0.5% to less than 3.0%, N: 0.001-0.02%, and a balance of Fe and inevitable impurities, satisfying formula (1) below, and includes an Si amorphous oxidation layer continuously or discontinuously formed at a thickness of 1 nm-100 nm on the surface thereof. Formula (1): 1.4≤0.4*Cr+Si≤3.2 (wherein element symbols denote measurements of respective element contents by weight %).
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公开(公告)号：US20240198633A1
公开(公告)日：2024-06-20
申请号：US18586317
申请日：2024-02-23
申请人： POSCO CO, LTD
发明人： Jin-Keun OH , Seong-Woo KIM , Hyeon-Jeong SHIN , A-Ra CHO
IPC分类号： B32B15/01 , B21D22/02 , B21D35/00 , B21D37/16 , B32B5/18 , B32B5/20 , B32B15/04 , B32B15/18 , C21D1/26 , C21D6/00 , C21D9/46 , C21D9/52 , C22C21/00 , C22C30/00 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/18 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/32 , C22C38/38 , C22C38/40 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/54 , C22C38/58 , C22C38/60 , C22F1/00 , C22F1/04 , C23C2/04 , C23C2/06 , C23C2/12 , C23C2/26 , C23C2/28 , C23C2/40 , C23C26/00 , C23C28/00 , C23C28/02 , C23C30/00 , C23F17/00
CPC分类号： B32B15/012 , B21D22/02 , B21D22/022 , B21D35/00 , B21D35/005 , B21D37/16 , B32B5/18 , B32B5/20 , B32B15/01 , B32B15/011 , B32B15/013 , B32B15/04 , B32B15/043 , B32B15/18 , C21D1/26 , C21D6/005 , C21D6/008 , C21D9/46 , C21D9/52 , C22C21/00 , C22C30/00 , C22C38/001 , C22C38/002 , C22C38/008 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/08 , C22C38/12 , C22C38/14 , C22C38/16 , C22C38/18 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/32 , C22C38/38 , C22C38/40 , C22C38/42 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/54 , C22C38/58 , C22C38/60 , C22F1/002 , C22F1/04 , C23C2/04 , C23C2/06 , C23C2/12 , C23C2/26 , C23C2/28 , C23C2/29 , C23C2/40 , C23C26/00 , C23C28/023 , C23C28/321 , C23C28/322 , C23C30/00 , C23C30/005 , C23F17/00 , Y10T428/12479 , Y10T428/12757 , Y10T428/12799 , Y10T428/12951 , Y10T428/12958 , Y10T428/12972 , Y10T428/12979 , Y10T428/12993
摘要： Provided is a steel sheet for a hot press formed member having excellent painting adhesion and post-painting corrosion resistance, and a method for manufacturing the same. A steel sheet for hot press forming according to one aspect of the present invention comprises a base steel sheet and a plated layer formed on a surface of the base steel sheet, wherein the ratio of an area occupied by pores to the entire area of a surface layer portion may be 10% or more in a cross section of the surface layer portion observed when the plated layer is cut in a thickness direction thereof.
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公开(公告)号：US20230416863A1
公开(公告)日：2023-12-28
申请号：US18242140
申请日：2023-09-05
申请人： POSCO Co., Ltd
发明人： Jin-Keun OH , Yeol-Rae CHO , A-Ra CHO , Jin-Ho CHA , Si-Myoung HEO , Jeong-Won SEO , Seong-Woo KIM
IPC分类号： C21D9/46 , B21B3/02 , B21D22/02 , C21D6/00 , C21D8/02 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/50 , C22C38/54
CPC分类号： C21D9/46 , B21B3/02 , B21D22/022 , C21D6/004 , C21D6/005 , C21D6/008 , C21D8/0205 , C21D8/0226 , C21D8/0236 , C21D8/0247 , C22C38/001 , C22C38/002 , C22C38/008 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/20 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/50 , C22C38/54 , C21D2211/003 , C21D2211/005
摘要： An aspect of the present invention relates to a cold-rolled steel plate for hot forming, which is excellent in corrosion-resistance and spot-weldability, contains, by weight %, C: 0.1-0.4%, Si: 0.5-2.0%, Mn: 0.01-4.0%, Al: 0.001-0.4%, P: 0.001-0.05%, S: 0.0001-0.02%, Cr: 0.5% to less than 3.0%, N: 0.001-0.02%, and a balance of Fe and inevitable impurities, satisfying formula (1) below, and includes an Si amorphous oxidation layer continuously or discontinuously formed at a thickness of 1 nm-100 nm on the surface thereof. Formula (1): 1.4≤0.4*Cr+Si≤3.2 (wherein element symbols denote measurements of respective element contents by weight %).
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公开(公告)号：US20240009963A1
公开(公告)日：2024-01-11
申请号：US18372314
申请日：2023-09-25
申请人： POSCO Co., Ltd.
发明人： Seong-Woo KIM , Jin-Keun OH , A-Ra CHO , Hyeon-Jeong SHIN
IPC分类号： B32B15/01 , C22C38/32 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/00 , C21D9/46 , C21D6/00 , C21D1/84 , C22C21/02 , C22F1/043 , C23C2/12 , C23C2/28 , B21D22/02
CPC分类号： B32B15/011 , C22C38/32 , C22C38/06 , C22C38/04 , C22C38/02 , C22C38/002 , C22C38/001 , C21D9/46 , C21D6/002 , C21D6/005 , C21D6/008 , C21D1/84 , C22C21/02 , C22F1/043 , C23C2/12 , C23C2/28 , B21D22/02
摘要： The present invention relates to a hot press formed member. A hot press formed member according to one aspect of the present invention comprises a steel sheet; and a plating layer on the steel sheet, wherein a number of voids per 1000 μm2 of an area from an interface between the plating layer and the steel sheet to 15 μm is zero and wherein a concentration gradient at a section having an Fe content of 45% to 80% in the plating layer in a thickness direction from a surface of the plating layer according to a result of GDS analysis is 7 wt %/μm or less.
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