公开(公告)号：US12226976B2

公开(公告)日：2025-02-18

申请号：US18406848

申请日：2024-01-08

Applicant: POSCO CO., LTD

Inventor： Jin-Keun Oh ,  Il-Ryoung Sohn ,  Seong-Woo Kim ,  Jeom-Soo Shin

IPC: B32B15/01 ,  C22C21/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/28 ,  C22C38/32 ,  C23C2/12 ,  C23C2/26 ,  C23C2/28 ,  C23C2/40

Abstract: The present disclosure relates to an aluminum-based plated steel that is provided for vehicles by hot forming, an aluminum-based alloy plated steel manufactured using the same, and method of manufacturing thereof.

公开(公告)号：US12123094B2

公开(公告)日：2024-10-22

申请号：US17297757

申请日：2019-11-29

Applicant: POSCO CO., LTD

Inventor： Jin-Keun Oh ,  Seong-Woo Kim ,  Yeol-Rae Cho ,  Sang-Heon Kim

IPC: B32B15/10 ,  B32B15/01 ,  C21D9/48 ,  C22C21/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/28 ,  C22C38/32 ,  C23C2/12 ,  C23C2/28 ,  C23C2/40

CPC classification number: C23C2/12 ,  B32B15/012 ,  C21D9/48 ,  C22C21/02 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/28 ,  C22C38/32 ,  C23C2/28 ,  C23C2/29 ,  C23C2/40

Abstract: The present invention provides an aluminum-based plated steel plate used in hot-press forming, the steel plate comprising: a base steel plate; and a plating layer formed on the base steel plate, wherein the plating layer comprises: an alloying layer formed on the surface of the base steel plate and including one or more of Fe 3Al, FeAl(Si), Fe 2Al 5, and FeAl 3; and an aluminum layer formed on the alloying layer and having a thickness less than 10% of the thickness of the plating layer, and the plating layer has a thickness of 5-20 μm and an oxygen content of 10 weight % or less, as measured by GDS, at a depth of 0.1 μm from the surface of the plating layer.

公开(公告)号：US20230286030A1

公开(公告)日：2023-09-14

申请号：US18019639

申请日：2021-10-19

Applicant: POSCO Co., Ltd

Inventor： Sang-Heon Kim ,  Jin-Keun Oh ,  Seong-Woo Kim ,  Sang-Bin Han

IPC: B21D22/02 ,  C22C38/38 ,  C22C38/32 ,  C22C38/60 ,  C22C38/28 ,  C22C38/04 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  C22C33/04 ,  C21D9/00 ,  C21D8/02 ,  C21D9/46 ,  C21D6/00

CPC classification number: B21D22/022 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0278 ,  C21D9/0081 ,  C21D9/46 ,  C22C33/04 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C22C38/60

Abstract: Provided are a plated steel sheet for hot press forming including: a base steel sheet containing, by wt%, 0.14 to 0.5% of C, 0.001 to 1% of Si, 0.3 to 4% of Mn, 0.001 to 0.015% of P, 0.0001 to 0.02% of S, 0.001 to 0.1% of Al, 0.001 to 1% of Cr, 0.001 to 0.02% of N, 0.1% or less of Ti, 0.01% or less of B, 0.005 to 0.1% of Sb, and a balance of Fe and unavoidable impurities; an aluminum or aluminum alloy plating layer provided on at least one surface of the base steel sheet; and a Sb-rich layer provided between the base steel sheet and the plating layer, wherein the plated steel sheet for hot press forming satisfies the following Relational Expressions 1-1 and 1-2, a hot press formed member manufactured using the same, and methods for manufacturing the plated steel sheet for hot press forming and the hot press formed member.









S

b

max




S

b

c
o
a
t




≥
1.2




­­­[Relational Expression 1-1]


















S

b

max


−
S

b

c
o
a
t





2

×
Δ
t
≥
0.008




­­­[Relational Expression 1-2]







[In Relational Expressions 1-1 and 1-2, Sbcoat represents an average content of Sb in the plating layer, and a unit thereof is wt%, Sbmax represents a maximum value of a content of Sb in the Sb-rich layer, and a unit thereof is wt%, and Δt represents a linear distance from a boundary between the plating layer and the Sb-rich layer to a point where Sbmax is measured, and a unit thereof is µm.]

公开(公告)号：US20250153234A1

公开(公告)日：2025-05-15

申请号：US18838858

申请日：2023-04-26

Applicant: POSCO CO., LTD

Inventor： Sang-Heon Kim ,  Jin-Keun Oh ,  Seong-Woo Kim ,  Sea-Woong Lee ,  Hyeon-Seok Hwang ,  Kkoch-Nim Oh

IPC: B21D22/02 ,  B32B15/01 ,  C21D6/00 ,  C21D8/02 ,  C21D9/48 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/08 ,  C22C38/14 ,  C22C38/16 ,  C22C38/60

Abstract: Provided are a hot press-formed part and a manufacturing method thereof, the hot press-formed part comprising: a base steel sheet; and a plating layer provided on at least one surface of the base steel sheet, wherein the plating layer includes an average number of Kirkendall voids per unit area in a specific range, in an area within 20 μm from the interface between the base steel sheet and the plating layer.

公开(公告)号：US20240410028A1

公开(公告)日：2024-12-12

申请号：US18794600

申请日：2024-08-05

Applicant: POSCO CO., LTD

Inventor： Jin-Keun Oh ,  Seong-Woo Kim ,  Sang-Heon Kim ,  Hyo-Sik Chun

IPC: C21D8/02 ,  C21D6/00 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/48 ,  C22C38/54 ,  C22C38/58 ,  C23C2/02 ,  C23C2/12 ,  C23C2/40

Abstract: Provided are plated steel sheets for hot press forming, hot press formed parts, and manufacturing methods thereof, the plated steel sheets comprising: a base steel sheet comprising, in weight %, C: 0.07 to 0.5%, Si: 0.05 to 1%, Mn: 0.5 to 5%, P: 0.001 to 0.015%, S: 0.0001 to 0.02%, Al: 0.01 to 0.18, Cr: 0.01 to 1%, N: 0.001 to 0.02%, Ti: 0.1% or less, B: 0.01% or less, Sn: 0.01 to 0.1%, and a balance of Fe and inevitable impurities; an aluminum or aluminum alloy plating layer disposed on at least one surface of the base steel sheet; and an Sn-enriched layer provided between the base steel sheet and the plating layer, wherein the Sn-enriched layer satisfies a specific relationship.

公开(公告)号：US20240401173A1

公开(公告)日：2024-12-05

申请号：US18691253

申请日：2022-12-20

Applicant: POSCO CO., LTD

Inventor： Jin-Keun Oh ,  Seong-Woo Kim ,  Sea-Woong Lee ,  Sang-Heon Kim ,  Jae-Seong Park ,  Ru-Ri Lee

IPC: C22C38/04 ,  C22C21/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/28 ,  C22C38/32 ,  C23C2/12 ,  C23C2/20

Abstract: The present disclosure relates to a plated steel sheet for hot press forming, having excellent paint adhesion and corrosion resistance after hot press forming; a preparation method for the plated steel sheet; and a hot press formed member. The plated steel sheet according to an aspect of the present disclosure comprises a base steel sheet and a plating layer consisting of Al—Fe alloy formed on the base steel sheet, wherein the sum of contents of Al and Fe in the plating layer is 80% or more by weight, the average content of Fe in the plating layer is 20% or more by weight, and the product of Ra and RPC of the surface of the plating layer may be 60-150 μm/cm. Here, Ra represents arithmetic mean roughness and the unit thereof is μm, and RPc represents the number of peaks per unit length and the unit thereof is /cm.

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：US20240295003A1

公开(公告)日：2024-09-05

申请号：US18643362

申请日：2024-04-23

Applicant: POSCO CO., LTD

Inventor： Seong-Woo Kim ,  Jin-Keun Oh ,  Sang-Heon Kim ,  Sang-Bin Han

IPC: C21D9/48 ,  B32B15/01 ,  C21D6/00 ,  C21D8/04 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/28 ,  C22C38/32 ,  C23C2/02 ,  C23C2/12 ,  C23C2/28 ,  C23C2/40

CPC classification number: C21D9/48 ,  B32B15/012 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0405 ,  C21D8/0421 ,  C21D8/0447 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/28 ,  C22C38/32 ,  C23C2/02 ,  C23C2/12 ,  C23C2/28 ,  C23C2/29 ,  C23C2/40

Abstract: The present invention pertains to a hot press forming member having excellent resistance to hydrogen embrittlement, and a method for manufacturing same. An aspect of the present invention provides a hot press forming member having excellent resistance to hydrogen embrittlement, the hot press forming member comprising a base steel plate and an alloy-plated layer formed on the surface of the base steel plate, wherein the alloy-plated layer contains pores such that pores having a size of 5 μm or less constitute 3-30% of the surface area of the alloy-plated layer as viewed in a cross-section taken in the thickness direction of the member.

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：US20250011912A1

公开(公告)日：2025-01-09

申请号：US18830214

申请日：2024-09-10

Applicant: POSCO CO., LTD

Inventor： Jin-Keun Oh ,  Seong-Woo Kim ,  Yeol-Rae Cho ,  Sang-Heon Kim

IPC: C23C2/12 ,  B32B15/01 ,  C21D9/48 ,  C22C21/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/28 ,  C22C38/32 ,  C23C2/28 ,  C23C2/40

Abstract: The present invention provides an aluminum-based plated steel plate used in hot-press forming, the steel plate comprising: a base steel plate; and a plating layer formed on the base steel plate, wherein the plating layer comprises: an alloying layer formed on the surface of the base steel plate and including one or more of Fe3Al, FeAl(Si), Fe2Al5, and FeAl3; and an aluminum layer formed on the alloying layer and having a thickness less than 10% of the thickness of the plating layer, and the plating layer has a thickness of 5-20 μm and an oxygen content of 10 weight % or less, as measured by GDS, at a depth of 0.1 μm from the surface of the plating layer.