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.

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：US20240182996A1

公开(公告)日：2024-06-06

申请号：US18286166

申请日：2022-08-12

Applicant: POSCO CO., LTD

Inventor： Sea-Woong Lee ,  Jin-Keun Oh ,  Seong-Woo Kim ,  Sang-Heon Kim ,  Hyo-Sik Chun ,  Sang-Bin Han

IPC: 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 classification number: 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

Abstract: 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：US11998971B2

公开(公告)日：2024-06-04

申请号：US18123460

申请日：2023-03-20

Applicant: POSCO CO., LTD

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

IPC: B32B15/01 ,  B21D35/00 ,  C21D6/00 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/28 ,  C22C38/32 ,  C23C2/12 ,  C23C2/26 ,  C23C2/28 ,  C23C2/40

CPC classification number: B21D35/007 ,  B32B15/012 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D9/46 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/28 ,  C22C38/32 ,  C23C2/12 ,  C23C2/26 ,  C23C2/28 ,  C23C2/29 ,  C23C2/40

Abstract: The present disclosure provides a hot-press formed part comprising a plated steel sheet and an aluminum alloy plated layer formed on the plated steel sheet, wherein the aluminum alloy plated layer comprises: an alloying layer (I) formed on the plated steel sheet and containing, by weight %, 5-30% of Al; an alloying layer (II) formed on the alloying layer (I) and containing, by weight %, 30 to 60% of Al; an alloying layer (III) formed on the alloying layer (II) and containing, by weight %, 20-50% of Al and 5-20% of Si; and an alloying layer (IV) formed continuously or discontinuously on at least a part of the surface of the alloying layer (III), and containing 30-60% of Al, wherein the rate of the alloying layer (III) exposed on the outermost surface of the aluminum alloy plated layer is 10% or more.

公开(公告)号：US11897014B2

公开(公告)日：2024-02-13

申请号：US18096260

申请日：2023-01-12

Applicant: POSCO CO., LTD

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

IPC: B21D35/00 ,  B32B15/01 ,  C21D6/00 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/28 ,  C22C38/32 ,  C23C2/12 ,  C23C2/28 ,  C23C2/40 ,  C23C2/26

CPC classification number: B21D35/007 ,  B32B15/012 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D9/46 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/28 ,  C22C38/32 ,  C23C2/12 ,  C23C2/26 ,  C23C2/28 ,  C23C2/29 ,  C23C2/40

Abstract: The present disclosure provides a hot-press formed part comprising a plated steel sheet and an aluminum alloy plated layer formed on the plated steel sheet, wherein the aluminum alloy plated layer comprises: an alloying layer (I) formed on the plated steel sheet and containing, by weight %, 5-30% of Al; an alloying layer (II) formed on the alloying layer (I) and containing, by weight %, 30 to 60% of Al; an alloying layer (III) formed on the alloying layer (II) and containing, by weight %, 20-50% of Al and 5-20% of Si; and an alloying layer (IV) formed continuously or discontinuously on at least a part of the surface of the alloying layer (III), and containing 30-60% of Al, wherein the rate of the alloying layer (III) exposed on the outermost surface of the aluminum alloy plated layer is 10% or more.

公开(公告)号：US20230383373A1

公开(公告)日：2023-11-30

申请号：US18034265

申请日：2021-12-03

Applicant: POSCO

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

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

CPC classification number: C21D8/0263 ,  C22C38/58 ,  C22C38/54 ,  C22C38/48 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/008 ,  C22C38/002 ,  C22C38/001 ,  C21D9/46 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0278 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C23C2/40 ,  C23C2/12

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 0.1%, 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：US11827947B2

公开(公告)日：2023-11-28

申请号：US16315767

申请日：2017-07-07

Applicant: POSCO

Inventor： Jin-Keun Oh ,  Seong-Woo Kim ,  Yeol-Rae Cho ,  Won-Mo Bak

IPC: C21D8/02 ,  B21B3/02 ,  B21B37/74 ,  C21D9/46 ,  C22C38/04 ,  C22C38/20 ,  C22C38/34 ,  C22C38/48

CPC classification number: C21D8/0226 ,  B21B3/02 ,  B21B37/74 ,  C21D8/0236 ,  C21D9/46 ,  C22C38/04 ,  C22C38/20 ,  C22C38/34 ,  C22C38/48 ,  B21B2201/02 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/008

Abstract: Provided is a hot press-formed member having excellent crack propagation resistance and ductility. The hot press-formed member includes: a base steel sheet and a zinc or zinc alloy plating layer on at least one surface of the base steel sheet. The base steel sheet contains, by wt %, carbon (C): 0.08-0.30%, silicon (Si): 0.01-2.0%, manganese (Mn): 3.1-8.0%, aluminum (Al): 0.001-0.5%, phosphorus (P): 0.001-0.05%, sulfur (S): 0.0001-0.02%, nitrogen (N): 0.02% or less, and a balance of iron (Fe) and other impurities. The hot press-formed member comprises 1-30 area % of retained austenite as a microstructure, and a Mn(wt %)/Zn(wt %) content ratio in an oxide layer of 0.5-1.2 μm in a thickness direction from a surface layer of the plating layer is 0.1 or more.

公开(公告)号：US11732323B2

公开(公告)日：2023-08-22

申请号：US17666972

申请日：2022-02-08

Applicant: POSCO

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

IPC: B32B15/01 ,  C21D9/46 ,  C21D6/00 ,  C21D8/02 ,  C22C21/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C23C2/12 ,  C23C2/40

CPC classification number: C21D9/46 ,  B32B15/012 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C22C21/02 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/06 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C23C2/12 ,  C23C2/40 ,  C21D2211/001 ,  C21D2211/005 ,  C21D2211/008 ,  C21D2211/009 ,  Y10T428/12757

Abstract: One aspect of the present invention relates to a plated steel sheet for hot press forming, having an excellent impact property.

公开(公告)号：US11654654B2

公开(公告)日：2023-05-23

申请号：US17473386

申请日：2021-09-13

Applicant: POSCO

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

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

CPC classification number: B32B15/012 ,  C22C21/02 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/28 ,  C22C38/32 ,  C23C2/12 ,  C23C2/28 ,  C23C2/40 ,  Y10T428/12757

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：US11491764B2

公开(公告)日：2022-11-08

申请号：US17297753

申请日：2019-11-29

Applicant: POSCO

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

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

Abstract: The present invention provides an iron-aluminum-based plated steel sheet, and a manufacturing method therefor, the iron-aluminum-based plated steel sheet comprising a base steel sheet and a plated layer formed on the surface of the base steel sheet, wherein the alloy plated layer comprises: a diffusion layer comprising an Fe—Al-based intermetallic compound having a cubic structure; and an alloyed layer formed on the diffusion layer and composed of an alloy phase differing from that of the cubic structure, the thickness of the diffusion layer is 3-20 μm, and the thickness of the diffusion layer is greater than 50% of the total thickness of the plated layer.