公开(公告)号：US12054801B2

公开(公告)日：2024-08-06

申请号：US17780677

申请日：2020-12-03

Applicant: POSCO

Inventor： Ki-Cheol Kang ,  Sang-Ho Uhm ,  Chung-Hwan Lee

IPC: C21D9/46 ,  B32B15/01 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C22C38/60 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40

CPC classification number: C21D9/46 ,  B32B15/013 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0273 ,  C22C38/001 ,  C22C38/002 ,  C22C38/008 ,  C22C38/02 ,  C22C38/06 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C22C38/60 ,  C23C2/02 ,  C23C2/022 ,  C23C2/0224 ,  C23C2/024 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40 ,  C21D2241/00

Abstract: The present invention relates to a zinc plated steel sheet having excellent surface quality and spot weldability, and a manufacturing method therefore. A zinc plated steel sheet according to one aspect of the present invention comprises a base steel sheet and a zinc-based plating layer formed on the surface of the base steel sheet, wherein the GDOES profile of oxygen, which is measured in the depth direction from the surface of the base steel sheet, has a form in which a local minimum point and a local maximum point alternately appear in the depth direction from the surface, and the difference (a local maximum value−a local minimum value) between the oxygen concentration (a local minimum value) at the local minimum point and the oxygen concentration (a local maximum value) at the local maximum point can be 0.1 wt % or more.

公开(公告)号：US10265795B2

公开(公告)日：2019-04-23

申请号：US14896133

申请日：2013-12-24

Applicant: POSCO

Inventor： Sang-Ho Uhm ,  Chung-Ha Kim ,  Ji-Hyun Kim ,  Won-Seog Bong

IPC: B23K9/23 ,  B23K9/16 ,  B23K9/167 ,  B23K9/00 ,  B23K9/173 ,  B23K35/30 ,  H02K1/18 ,  H02K15/02 ,  B23K101/36 ,  B23K103/04 ,  B23K103/22

Abstract: There are provided a method for manufacturing an electrical steel sheet laminated core having reduced core loss and improved strength, and a laminated core produced by the manufacturing method. The method includes: stacking electrical steel sheets to obtain a lamination; and welding an outer surface of the lamination, wherein during the welding, a welding wire having a resistivity of 6.5×10−7 Ωm or greater, a relative permeability of less than 1.02, and a melting point lower than that of the electrical steel sheets is used as a welding material.

公开(公告)号：US12221701B2

公开(公告)日：2025-02-11

申请号：US18622583

申请日：2024-03-29

Applicant: POSCO CO., LTD

Inventor： Ki-Cheol Kang ,  Sang-Ho Uhm ,  Chang-Woon Jee ,  Yeon-Chae Jeong ,  Kwang-Tai Min

IPC: C23C2/06 ,  C21D8/02 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/22 ,  C22C38/24 ,  C22C38/26 ,  C22C38/32 ,  C22C38/38 ,  C23C2/02 ,  C23C2/28 ,  C23C2/40

Abstract: A welded member includes: a first steel sheet including a base steel sheet and a zinc-based plating layer formed on a surface of the base steel sheet; and a second steel sheet spot-welded on the first steel sheet and facing the zinc-based plating layer of the first steel sheet, a spot-welded zone being formed between the first steel sheet and the second steel sheet. A surface layer of the base steel sheet has a decarburization ratio of 30% or more. The decarburization ratio is represented by equation: Decarburization ratio (%) of surface layer=(1−average carbon concentration in surface layer/bulk carbon concentration)*100 where the surface layer refers to a region of the base steel sheet from the surface thereof to a depth of 35 μm. A shoulder portion of the spot-welded zone includes a B-type crack having a length of 100 μm or less, and no C-type crack.

公开(公告)号：US20240149377A1

公开(公告)日：2024-05-09

申请号：US18280011

申请日：2022-06-08

Applicant: POSCO Co., Ltd

Inventor： Sang-Ho Uhm ,  Chung-Ha Kim Kim ,  Il-Wook Han

IPC: B23K26/32 ,  B23K26/21 ,  B23K35/32 ,  C22C38/02 ,  C22C38/04 ,  C23C2/12 ,  C23C2/40

CPC classification number: B23K26/32 ,  B23K26/21 ,  B23K35/32 ,  C22C38/02 ,  C22C38/04 ,  C23C2/12 ,  C23C2/40

Abstract: According to one aspect of the present invention, it is possible to provide a tailor welded blank, a hot press formed part, and a method for manufacturing same, the tailor welded blank having a weld part that can effectively prevent deterioration of properties after hot press forming.

公开(公告)号：US20240368724A1

公开(公告)日：2024-11-07

申请号：US18773036

申请日：2024-07-15

Applicant: POSCO CO, LTD

Inventor： Ki-Cheol Kang ,  Sang-Ho Uhm ,  Chung-Hwan Lee

IPC: C21D9/46 ,  B32B15/01 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/44 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C22C38/60 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28 ,  C23C2/40

Abstract: The present invention relates to a zinc plated steel sheet having excellent surface quality and spot weldability, and a manufacturing method therefore. A zinc plated steel sheet according to one aspect of the present invention comprises a base steel sheet and a zinc-based plating layer formed on the surface of the base steel sheet, wherein the GDOES profile of oxygen, which is measured in the depth direction from the surface of the base steel sheet, has a form in which a local minimum point and a local maximum point alternately appear in the depth direction from the surface, and the difference (a local maximum value−a local minimum value) between the oxygen concentration (a local minimum value) at the local minimum point and the oxygen concentration (a local maximum value) at the local maximum point can be 0.1 wt % or more.

公开(公告)号：US20240024979A1

公开(公告)日：2024-01-25

申请号：US18266198

申请日：2022-06-28

Applicant: POSCO Co., Ltd

Inventor： Mok-Young Lee ,  Du-Youl Choi ,  Sang-Ho Uhm ,  Do-Kyeong Han

IPC: B23K26/00 ,  B23K35/02 ,  B23K35/30

CPC classification number: B23K26/0006 ,  B23K35/0261 ,  B23K35/3073

Abstract: One embodiment of the present invention provides a carbon filament wire for laser welding of a steel sheet having an aluminum-based coating layer, a laser welding method of a steel sheet having an aluminum-based coating layer by using same, and a welded product produced by same, the carbon filament wire comprising: a resin matrix; and two or more carbon filaments provided inside the resin matrix.

公开(公告)号：US20230018291A1

公开(公告)日：2023-01-19

申请号：US17780677

申请日：2020-12-03

Applicant: POSCO

Inventor： Ki-Cheol Kang ,  Sang-Ho Uhm ,  Chung-Hwan Lee

IPC: C21D9/46 ,  C21D8/02 ,  C21D6/00 ,  C22C38/60 ,  C22C38/54 ,  C22C38/50 ,  C22C38/48 ,  C22C38/44 ,  C22C38/06 ,  C22C38/58 ,  C22C38/02 ,  C22C38/00 ,  B32B15/01 ,  C23C2/06 ,  C23C2/40

Abstract: The present invention relates to a zinc plated steel sheet having excellent surface quality and spot weldability, and a manufacturing method therefore. A zinc plated steel sheet according to one aspect of the present invention comprises a base steel sheet and a zinc-based plating layer formed on the surface of the base steel sheet, wherein the GDOES profile of oxygen, which is measured in the depth direction from the surface of the base steel sheet, has a form in which a local minimum point and a local maximum point alternately appear in the depth direction from the surface, and the difference (a local maximum value—a local minimum value) between the oxygen concentration (a local minimum value) at the local minimum point and the oxygen concentration (a local maximum value) at the local maximum point can be 0.1 wt % or more.