Invention Grant
- Patent Title: Advanced high strength zinc plated steel sheet having excellent surface quality and electrical resistance spot weldability
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Application No.: US17787174Application Date: 2020-12-18
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Publication No.: US12000008B2Publication Date: 2024-06-04
- Inventor: Ki-Cheol Kang , Chung-Hwan Lee , Yong-Joo Kim , Kang-Min Lee , Kyoo-Young Lee
- Applicant: POSCO
- Applicant Address: KR Pohang-si
- Assignee: POSCO
- Current Assignee: POSCO
- Current Assignee Address: KR Pohang-si
- Agency: Morgan, Lewis & Bockius LLP
- Priority: KR 20190171690 2019.12.20
- International Application: PCT/KR2020/018680 2020.12.18
- International Announcement: WO2021/125885A 2021.06.24
- Date entered country: 2022-06-17
- Main IPC: B32B15/01
- 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
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.
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