公开(公告)号：US20240026488A1

公开(公告)日：2024-01-25

申请号：US18266483

申请日：2021-12-21

Applicant: POSCO Co., Ltd.

Inventor： Ki-Cheol Kang ,  Yong-Joo Kim ,  Tae-Chul Kim ,  Myung-Soo Kim ,  Jong-Sang Kim

IPC: C21D9/46 ,  C22C38/60 ,  C22C38/38 ,  C22C38/34 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/22 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C21D6/00 ,  C21D1/74 ,  B32B15/01 ,  C23C2/02 ,  C23C2/40

CPC classification number: C21D9/46 ,  C22C38/60 ,  C22C38/38 ,  C22C38/34 ,  C22C38/32 ,  C22C38/28 ,  C22C38/26 ,  C22C38/22 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/008 ,  C22C38/002 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C21D8/0273 ,  C21D8/0278 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D1/74 ,  B32B15/013 ,  C23C2/02 ,  C23C2/40

Abstract: The present invention relates to a high-strength hot-dipped galvanized steel sheet having excellent surface quality and spot weldability and a method for manufacturing same. The hot-dipped galvanized steel sheet according to one aspect of the present invention comprises a base steel sheet and a hot-dipped galvanized layer formed on the surface of the base steel sheet, in which an inhibiting layer made of an Fe—Al alloy can be formed at an area ratio of 60% or more between the base steel sheet and the hot-dipped galvanized layer.

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.

公开(公告)号：US12000008B2

公开(公告)日：2024-06-04

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: B32B15/01 ,  B32B15/04 ,  B32B15/18 ,  C21D1/19 ,  C21D1/25 ,  C21D1/76 ,  C21D1/84 ,  C21D3/04 ,  C21D6/00 ,  C21D8/02 ,  C21D9/46 ,  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.

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.

公开(公告)号：US20230021399A1

公开(公告)日：2023-01-26

申请号：US17787019

申请日：2020-12-02

Applicant: POSCO

Inventor： Heung-Yun Kim ,  Sung-Joo Kim ,  Yong-Joo Kim ,  Dae-Young Kang

IPC: C23C2/06 ,  C23C2/28

Abstract: An exemplary embodiment in the present disclosure provides a hot-dip Zn—Al—Mg-based alloy-plated steel material having excellent corrosion resistance in a processed portion, and a method for manufacturing the same. The steel material includes: an iron substrate; and a hot-dip alloy-plated layer formed on the iron substrate, wherein the hot-dip alloy-plated layer contains, by wt %, more than 8% to 25% of Al, more than 4% to 12% of Mg, and a balance of Zn and inevitable impurities, a fraction of a MgZn2 phase in the hot-dip alloy-plated layer is 10 to 45 area %, cracks are formed inside the MgZn2 phase, and the number of cracks present per 100 μm in a direction perpendicular to a thickness direction of a steel sheet in a field of view in which the cracks are observed based on a cross section in the thickness direction of the steel sheet is 3 to 80.

公开(公告)号：US20230019786A1

公开(公告)日：2023-01-19

申请号：US17782401

申请日：2020-12-01

Applicant: POSCO

Inventor： Sung-Joo Kim ,  Heung-Yun Kim ,  Myung-Soo Kim ,  Dae-Young Kang ,  Yong-Joo Kim

IPC: C23C2/14 ,  C23C2/26 ,  C23C2/00 ,  C23C2/40 ,  C23C2/06

Abstract: A hot-dipped galvanized steel sheet having excellent bending workability and corrosion resistance and a manufacturing method therefor are provided. A hot-dipped galvanized steel sheet of the present invention comprises: a base steel sheet; a Zn—Mg—Al based plating layer provided on at least one surface of the base steel sheet and including, in wt %, with respect to components other than iron (Fe) diffused from the base steel sheet, 5.1 to 25% of Al and 4.0-10% of Mg, and the remainder of Zn and other inevitable impurities; and an interfacial alloy layer having a Fe—Al—Zn composition formed between the base steel sheet and the plating layer, wherein the interfacial alloy layer has a thickness of 0.5-2 μm and has a dendritic form, the Zn—Mg—Al based plating layer has a Zn—Al—MgZn2 ternary eutectic structure, a Zn—MgZn2 binary eutectic structure, and a structure including one or more of an Al single-phase structure having solid-solubilized Zn and a Zn single-phase structure, and agglomerated Al is included in a MgZn2 structure.