公开(公告)号：US12049679B2

公开(公告)日：2024-07-30

申请号：US18242140

申请日：2023-09-05

Applicant: POSCO Co., Ltd

Inventor： Jin-Keun Oh ,  Yeol-Rae Cho ,  A-Ra Cho ,  Jin-Ho Cha ,  Si-Myoung Heo ,  Jeong-Won Seo ,  Seong-Woo Kim

IPC: 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 classification number: 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

Abstract: 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 %).

公开(公告)号：US11441205B2

公开(公告)日：2022-09-13

申请号：US16336645

申请日：2017-09-26

Applicant: POSCO

Inventor： Jin-Keun Oh ,  Yeol-Rae Cho ,  A-Ra Cho ,  Jin-Ho Cha ,  Si-Myoung Heo ,  Jeong-Won Seo ,  Seong-Woo Kim

IPC: 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

Abstract: Provided is 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 %).

公开(公告)号：US11820103B2

公开(公告)日：2023-11-21

申请号：US17517399

申请日：2021-11-02

Applicant: POSCO

Inventor： Seong-Woo Kim ,  Jin-Keun Oh ,  A-Ra Cho ,  Hyeon-Jeong Shin

IPC: B32B15/01 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/28 ,  C22C38/32 ,  C23C2/12 ,  C23C2/28 ,  B21D22/02 ,  C21D9/46 ,  C22F1/00 ,  C22F1/04 ,  C21D6/00 ,  C23C2/40 ,  C23F17/00 ,  B21D35/00 ,  C23C26/00 ,  C23C28/02 ,  C23C30/00 ,  C23C28/00 ,  B32B15/18 ,  C23C2/04 ,  B32B15/04 ,  C23C2/26 ,  C23C2/06 ,  C22C30/00 ,  C22C38/14 ,  C22C38/48 ,  C22C38/40 ,  C22C38/18 ,  C22C38/42 ,  C22C38/44 ,  C22C38/08 ,  C22C38/16 ,  C22C38/24 ,  C22C21/00 ,  C22C38/38 ,  C22C38/46 ,  C22C38/20 ,  C22C38/26 ,  C22C38/22 ,  C22C38/58 ,  C22C38/12 ,  C22C38/50 ,  C22C38/54 ,  B21D37/16 ,  B32B5/20 ,  B32B5/18 ,  C21D9/52 ,  C21D1/26 ,  C22C38/60

CPC classification number: 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

Abstract: The present invention relates to a steel sheet for a hot press formed member having excellent coating adhesion, and a method for manufacturing the same. A steel sheet for hot press forming according to one aspect of the present invention is an aluminum alloy plated steel sheet, wherein an average Fe content in a plating layer may be 40 wt % or more, and a concentration gradient of a section having a Fe content of 45 wt % to 80 wt % in the plating layer may 7 wt %/μm or less of 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.

公开(公告)号：US11624100B2

公开(公告)日：2023-04-11

申请号：US17885860

申请日：2022-08-11

Applicant: POSCO

Inventor： Jin-Keun Oh ,  Yeol-Rae Cho ,  A-Ra Cho ,  Jin-Ho Cha ,  Si-Myoung Heo ,  Jeong-Won Seo ,  Seong-Woo Kim

IPC: 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

Abstract: 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 %).

公开(公告)号：US20240301527A1

公开(公告)日：2024-09-12

申请号：US18666200

申请日：2024-05-16

Applicant: POSCO CO., LTD

Inventor： Jin-Keun Oh ,  Yeol-Rae Cho ,  A-Ra Cho ,  Jin-Ho Cha ,  Si-Myoung Heo ,  Jeong-Won Seo ,  Seong-Woo Kim

IPC: 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 classification number: 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

Abstract: 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 %).

公开(公告)号：US11788166B2

公开(公告)日：2023-10-17

申请号：US18114387

申请日：2023-02-27

Applicant: POSCO Co., Ltd

Inventor： Jin-Keun Oh ,  Yeol-Rae Cho ,  A-Ra Cho ,  Jin-Ho Cha ,  Si-Myoung Heo ,  Jeong-Won Seo ,  Seong-Woo Kim

IPC: 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 classification number: 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

Abstract: 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 %).

公开(公告)号：US11198272B2

公开(公告)日：2021-12-14

申请号：US16617862

申请日：2018-05-31

Applicant: POSCO

Inventor： Seong-Woo Kim ,  Jin-Keun Oh ,  A-Ra Cho ,  Hyeon-Jeong Shin

IPC: C21D9/46 ,  C21D6/00 ,  C23C2/12 ,  C23C2/28 ,  C23C2/40 ,  C23F17/00 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  B32B15/01 ,  C22C38/28 ,  C22C38/32 ,  B21D22/02 ,  C22F1/00 ,  C22F1/04 ,  B21D35/00 ,  C23C26/00 ,  C23C28/02 ,  C23C30/00 ,  C23C28/00 ,  B32B15/18 ,  C23C2/04 ,  B32B15/04 ,  C23C2/26 ,  C23C2/06 ,  C22C30/00 ,  C22C38/14 ,  C22C38/48 ,  C22C38/40 ,  C22C38/18 ,  C22C38/42 ,  C22C38/44 ,  C22C38/08 ,  C22C38/16 ,  C22C38/24 ,  C22C21/00 ,  C22C38/38 ,  C22C38/46 ,  C22C38/20 ,  C22C38/26 ,  C22C38/22 ,  C22C38/58 ,  C22C38/12 ,  C22C38/50 ,  C22C38/54

Abstract: Provided is a steel sheet for a hot press formed member having excellent coating adhesion, and a method for manufacturing the same. A steel sheet for hot press forming is an aluminum alloy plated steel sheet, wherein an average Fe content in a plating layer may be 40 wt % or more, and a concentration gradient of a section having a Fe content of 45 wt % to 80 wt % in the plating layer may 7 wt %/μm or less of 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.

公开(公告)号：US11141953B2

公开(公告)日：2021-10-12

申请号：US16617798

申请日：2018-05-31

Applicant: POSCO

Inventor： Jin-Keun Oh ,  Seong-Woo Kim ,  Hyeon-Jeong Shin ,  A-Ra Cho

IPC: B32B15/01 ,  C22C38/32 ,  C22C38/28 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C23C2/12 ,  C23C2/28 ,  B21D22/02 ,  C21D9/46 ,  C22F1/00 ,  C22F1/04 ,  C21D6/00 ,  C23C2/40 ,  C23F17/00 ,  B21D35/00 ,  C23C26/00 ,  C23C28/02 ,  C23C30/00 ,  C23C28/00 ,  B32B15/18 ,  C23C2/04 ,  B32B15/04 ,  C23C2/26 ,  C23C2/06 ,  C22C30/00 ,  C22C38/14 ,  C22C38/48 ,  C22C38/40 ,  C22C38/18 ,  C22C38/42 ,  C22C38/44 ,  C22C38/08 ,  C22C38/16 ,  C22C38/24 ,  C22C21/00 ,  C22C38/38 ,  C22C38/46 ,  C22C38/20 ,  C22C38/26 ,  C22C38/22 ,  C22C38/58 ,  C22C38/12 ,  C22C38/50 ,  C22C38/54

Abstract: 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.