Title:
ADVANCED HIGH STRENGTH ZINC PLATED STEEL SHEET HAVING EXCELLENT SURFACE QUALITY AND ELECTRICAL RESISTANCE SPOT WELDABILITY AND MANUFACTURING METHOD THEREOF
Document Type and Number:
WIPO Patent Application WO/2021/125885
Kind Code:
A1
Abstract:
The present invention relates to a high-strength hot-dip galvanized steel sheet with excellent surface quality and electric resistance spot weldability, and a method for manufacturing same. A galvanized steel sheet, according to one aspect of the present invention, is a galvanized steel sheet comprising a base steel sheet and a zinc-based plated layer formed on the surface of the base steel sheet, wherein the ratio (a/b) of surface hardness (a) to internal hardness (b) of the base steel sheet may be less than 0.95.
Inventors:
KANG KI-CHEOL (KR)
LEE CHUNG-HWAN (KR)
KIM YONG-JOO (KR)
LEE KANG-MIN (KR)
LEE KYOO-YOUNG (KR)
LEE CHUNG-HWAN (KR)
KIM YONG-JOO (KR)
LEE KANG-MIN (KR)
LEE KYOO-YOUNG (KR)
Application Number:
PCT/KR2020/018680
Publication Date:
June 24, 2021
Filing Date:
December 18, 2020
Export Citation:
Assignee:
POSCO (KR)
International Classes:
C23C2/06; C21D8/02; C22C38/22; C22C38/26; C22C38/28; C22C38/34; C22C38/38; C23C2/02; C23C2/28; C23C2/40
Foreign References:
| KR20160101095A | 2016-08-24 | |||
| KR20190078437A | 2019-07-04 | |||
| JP2610948B2 | 1997-05-14 | |||
| JP2005105361A | 2005-04-21 | |||
| US20080075971A1 | 2008-03-27 |
Other References:
See also references of EP 4079921A4
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
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