Patent search ap:("POSCO") AND inv:"Ki-Cheol Kang" Page 2

11.

发明公开
HIGH-STRENGTH HOT-DIP GALVANIZED STEEL SHEET HAVING EXCELLENT PLATING QUALITY, STEEL SHEET FOR PLATING, AND METHODS FOR MANUFACTURING SAME 审中-公开

公开(公告)号：US20240018676A1

公开(公告)日：2024-01-18

申请号：US18038914

申请日：2021-12-09

Applicant: POSCO Co., Ltd

Inventor： Jin-Ho Jung , Won-Hwi Lee , Ki-Cheol Kang , Seong-Choon Kwon

IPC: C25D3/20 , C22C38/38 , C22C38/32 , C22C38/28 , C22C38/22 , C22C38/06 , C22C38/00 , C22C38/02 , C21D9/46 , C21D1/74 , C25D5/50 , C23C2/06 , C23C28/02

CPC classification number: C25D3/20 , C22C38/38 , C22C38/32 , C22C38/28 , C22C38/22 , C22C38/06 , C22C38/002 , C22C38/02 , C21D9/46 , C21D1/74 , C25D5/50 , C23C2/06 , C23C28/021

Abstract: The steel sheet for plating according to an aspect of the present invention has a GDS profile of an Mn element, as observed in the depth direction from the surface, sequentially including a maximum point and a minimum point, wherein a difference of converted concentration of Mn may be 80% or more, and a difference of converged concentration of Si may be 50% or more.

12.

发明公开
HIGH STRENGTH ZINC-PLATED STEEL SHEET HAVING EXCELLENT UNIFORM SPOT WELDABILITY ALONG WIDTH DIRECTION AND MANUFACTURING METHOD THEREOF 审中-公开

公开(公告)号：US20240043947A1

公开(公告)日：2024-02-08

申请号：US18266784

申请日：2021-12-07

Applicant: POSCO Co., Ltd

Inventor： Ki-Cheol Kang , Dae-Young Kang , Tae-Chul Kim , Seul-Gi So , Myung-Soo Kim , Jong-Sang Kim

IPC: C21D8/02 , C22C38/00 , C22C38/34 , C22C38/38 , C22C38/32 , C22C38/28 , C22C38/26 , C22C38/22 , C23C2/06 , C23C2/40 , C21D9/46

CPC classification number: C21D8/0205 , C21D8/0226 , C21D8/0263 , C22C38/001 , C22C38/34 , C22C38/38 , C22C38/32 , C22C38/28 , C22C38/26 , C22C38/22 , C23C2/06 , C23C2/40 , C21D9/46 , C22C38/002

Abstract: According to an aspect of the present invention, provided are a high strength zinc-plated steel sheet having excellent uniform spot weldability along the width direction, and a manufacturing method thereof.

13.

发明公开
HIGH STRENGTH HOT-DIP GALVANIZED STEEL SHEET HAVING EXCELLENT PLATING ADHESION AND WELDABILITY AND METHOD OF MANUFACTURING SAME 审中-公开

公开(公告)号：US20240011119A1

公开(公告)日：2024-01-11

申请号：US18267342

申请日：2021-12-09

Applicant: POSCO

Inventor： Young-Ha Kim , Myung-Soo Kim , Kwang-Tai Min , Ki-Cheol Kang

IPC: C21D9/46 , C23C2/40 , C22C38/02 , C22C38/04 , C22C38/06 , C23C2/00 , C23C2/06 , C21D8/02 , C23G1/00

CPC classification number: C21D9/46 , C23C2/40 , C22C38/02 , C22C38/04 , C22C38/06 , C23C2/522 , C23C2/06 , C21D8/0226 , C21D8/0236 , C23G1/00

Abstract: An embodiment of the present invention provides a high strength hot-dip galvanized steel sheet having excellent plating adhesion and weldability and a method of manufacturing same, wherein: the steel sheet comprises a base steel sheet and a hot-dip galvanized layer formed on one surface or both surfaces of the base steel sheet, the base steel sheet comprising, in weight %, carbon (C): 0.1-0.3%, silicon (Si): 0.1-2.0%, aluminum (Al): 0.1-1.5%, manganese (Mn): 1.5-3.0%, and the balance being Fe and inevitable impurities, the sum of Si and Al satisfying 1.2-3.5%, the ratio (Al/Si) of Al and Si satisfying 0.5-2.0; the steel sheet comprises an internal oxidation layer with a thickness of 1-5 μm directly below the surface of the base steel sheet; and the decarburization rate in a region from directly below the surface of the base steel sheet to 50 μm is 50% or more.

14.

发明申请
ADVANCED HIGH STRENGTH ZINC PLATED STEEL SHEET HAVING EXCELLENT SURFACE QUALITY AND ELECTRICAL RESISTANCE SPOT WELDABILITY AND MANUFACTURING METHOD THEREOF 有权

公开(公告)号：US20230024115A1

公开(公告)日：2023-01-26

申请号：US17787174

申请日：2020-12-18

Applicant: POSCO

Inventor： Ki-Cheol Kang , Chung-Hwan Lee , Yong-Joo Kim , Kang-Min Lee , Kyoo-Young Lee

IPC: C21D9/46 , B32B15/01 , C22C38/38 , C22C38/34 , C22C38/32 , C22C38/28 , C22C38/26 , C22C38/22 , C22C38/06 , C22C38/00 , C21D8/02 , C21D6/00 , C23C2/06 , C23C2/40 , C23C2/02

Abstract: The present disclosure relates to a high-strength hot-dip galvanized steel sheet having excellent surface quality and electrical resistance spot weldability, and a method for manufacturing the same. A galvanized steel sheet according to an aspect of the present disclosure is a galvanized steel sheet including a base steel sheet and a zinc-based plating layer formed on a surface of the base steel sheet, wherein a ratio (a/b) of a hardness of a surface layer portion (a) to a hardness of an internal portion (b) of the base steel sheet may be less than 0.95.

15.

发明授权
High-strength hot-dip galvanized steel sheet having excellent surface quality and spot weldability 有权

公开(公告)号：US10900097B2

公开(公告)日：2021-01-26

申请号：US16060208

申请日：2016-12-13

Applicant: POSCO

Inventor： Myung-Soo Kim , Ki-Cheol Kang , Il-Jeong Park

IPC: C22C38/28 , C22C38/38 , C22C38/06 , C22C38/02 , C22C38/00 , C23C2/06 , C23C2/02 , B32B15/01 , C21D8/02 , C22C38/04 , C22C38/22 , C22C38/34 , C21D9/46 , C21D6/00 , C23C2/40 , C22C38/32 , C21D1/76 , C23C2/28 , C22C38/26 , C22C38/14 , B32B15/04 , C23C30/00 , C23C28/02 , C22C38/60 , C22C38/18 , C22C38/12 , B32B15/18

Abstract: Provided is a high-strength hot-dip galvanized steel sheet having good surface quality and spot weldability. The high-strength hot-dip galvanized steel sheet includes a base steel sheet and a zinc plating layer formed on the base steel sheet. The base steel sheet includes carbon (C): 0.1% to 0.3%, silicon (Si): 0.5% to 2.5%, manganese (Mn): 2.0% to 8.0%, soluble aluminum (sol.Al): 0.001% to 0.5%, phosphorus (P): 0.04% or less (excluding 0%), sulfur (S): 0.015% or less, nitrogen (N): 0.02% or less, chromium (Cr): 0.01% to 0.7%, titanium (Ti): (48/14)*[N] % to 0.1%, and a balance of iron (Fe) and inevitable impurities. The base steel sheet has a microstructure comprising ferrite in an area fraction of 5% to 30%, austenite in an area fraction of 5% to 20%, bainite and martensite in an area fraction of 50% to 80%, and precipitates in an area fraction of 2% or less.

16.

发明申请
ZINC PLATED STEEL SHEET HAVING EXCELLENT SURFACE QUALITY AND SPOT WELDABILITY, AND MANUFACTURING METHOD THEREFOR 有权

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.

17.

发明公开
ADVANCED HIGH STRENGTH ZINC PLATED STEEL SHEET HAVING EXCELLENT SURFACE QUALITY AND ELECTRICAL RESISTANCE SPOT WELDABILITY AND MANUFACTURING METHOD THEREOF 审中-公开

公开(公告)号：US20240344164A1

公开(公告)日：2024-10-17

申请号：US18646241

申请日：2024-04-25

Applicant: POSCO CO., LTD

Inventor： Ki-Cheol Kang , Chung-Hwan Lee , Yong-Joo Kim , Kang-Min Lee , Kyoo-Young Lee

IPC: C21D9/46 , B32B15/01 , B32B15/04 , B32B15/18 , C21D1/19 , C21D1/25 , C21D1/76 , C21D1/84 , C21D3/04 , C21D6/00 , C21D8/02 , C21D9/56 , C22C38/00 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14 , C22C38/18 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/32 , C22C38/34 , C22C38/38 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/58 , C23C2/02 , C23C2/06 , C23C2/28 , C23C2/40 , C23C28/00 , C23C28/02 , C23C30/00

CPC classification number: C21D9/46 , B32B15/01 , B32B15/013 , B32B15/04 , B32B15/043 , B32B15/18 , C21D1/19 , C21D1/25 , C21D1/76 , C21D1/84 , C21D3/04 , C21D6/002 , C21D6/005 , C21D6/008 , C21D8/0205 , C21D8/0226 , C21D8/0236 , C21D8/0257 , C21D8/0263 , C21D8/0273 , C21D8/0278 , C21D9/562 , C22C38/001 , C22C38/008 , C22C38/02 , C22C38/04 , C22C38/06 , C22C38/12 , C22C38/14 , C22C38/18 , C22C38/22 , C22C38/24 , C22C38/26 , C22C38/28 , C22C38/32 , C22C38/34 , C22C38/38 , C22C38/44 , C22C38/46 , C22C38/48 , C22C38/50 , C22C38/58 , C23C2/02 , C23C2/022 , C23C2/0224 , C23C2/024 , C23C2/06 , C23C2/28 , C23C2/29 , C23C2/40 , C23C28/025 , C23C28/3225 , C23C28/345 , C23C30/00 , C23C30/005 , B32B2307/732 , Y10T428/12583 , Y10T428/1259 , Y10T428/12597 , Y10T428/12611 , Y10T428/12618 , Y10T428/1266 , Y10T428/12667 , Y10T428/12799 , Y10T428/12958 , Y10T428/12965 , Y10T428/12972 , Y10T428/12993 , Y10T428/24942 , Y10T428/2495 , Y10T428/24967 , Y10T428/24983 , Y10T428/26 , Y10T428/27 , Y10T428/273

Abstract: The present disclosure relates to a high-strength hot-dip galvanized steel sheet having excellent surface quality and electrical resistance spot weldability, and a method for manufacturing the same. A galvanized steel sheet according to an aspect of the present disclosure is a galvanized steel sheet including a base steel sheet and a zinc-based plating layer formed on a surface of the base steel sheet, wherein a ratio (a/b) of a hardness of a surface layer portion (a) to a hardness of an internal portion (b) of the base steel sheet may be less than 0.95.

18.

发明公开
ZINC PLATED STEEL SHEET HAVING EXCELLENT FATIGUE STRENGTH OF ELECTRICAL RESISTANCE SPOT WELDS, AND MANUFACTURING METHOD THEREOF 审中-公开

公开(公告)号：US20240295002A1

公开(公告)日：2024-09-05

申请号：US18661194

申请日：2024-05-10

Applicant: POSCO CO., LTD

Inventor： Ki-Cheol Kang , Chung-Hwan Lee

IPC: C21D9/46 , B32B15/01 , C21D6/00 , C21D8/02 , C22C38/00 , C22C38/02 , C22C38/06 , C22C38/22 , C22C38/26 , C22C38/28 , C22C38/32 , C22C38/38 , 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 , C22C38/22 , C22C38/26 , C22C38/28 , C22C38/32 , C22C38/38 , C23C2/02 , C23C2/022 , C23C2/024 , C23C2/06 , C23C2/28 , C23C2/40 , B32B2307/718

Abstract: The present disclosure relates to a zinc plated steel sheet having excellent fatigue strength of electrical resistance spot welds and a method for manufacturing the same. According to an aspect of the present disclosure, a zinc plated steel sheet includes a base steel sheet and a zinc-based plating layer formed on a surface of the base steel sheet, wherein a concentration profile of one or two of oxygen, and silicon and manganese measured in a depth direction from the surface of the base steel sheet has a maximum point in the depth direction from the surface, and an absolute value of a difference between a depth at which the maximum point of the concentration profile of oxygen is formed and a depth at which the maximum point of the concentration profile of one of silicon and manganese is formed is 0.5 μm or less.