Title:
ZINC PLATED STEEL SHEET HAVING EXCELLENT FATIGUE STRENGTH OF ELECTRICAL RESISTANCE SPOT WELDS, AND MANUFACTURING METHOD THEREOF
Document Type and Number:
WIPO Patent Application WO/2021/112581
Kind Code:
A1
Abstract:
The present invention relates to a zinc plated steel sheet having excellent fatigue strength of electrical resistance spot welds, and a manufacturing method thereof. The zinc plated steel sheet according to an 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 concentration profile of one or two among oxygen, silicon, and manganese measured in the depth direction from the surface of the base steel sheet has a peak in the depth direction from the surface, and the absolute value of the difference between the depth at which the peak of the concentration profile of oxygen is formed and the depth at which the peak point of the concentration profile of silicon or manganese is formed is 0.5 μm or less.
Inventors:
KANG KI-CHEOL (KR)
LEE CHUNG-HWAN (KR)
LEE CHUNG-HWAN (KR)
Application Number:
PCT/KR2020/017532
Publication Date:
June 10, 2021
Filing Date:
December 03, 2020
Export Citation:
Assignee:
POSCO (KR)
International Classes:
C23C2/06; C22C38/00; C22C38/02; C22C38/04; C22C38/28; C22C38/34; C22C38/38; C23C2/02; C23C2/28; C23C2/40
Foreign References:
| KR20190073200A | 2019-06-26 | |||
| KR101630976B1 | 2016-06-16 | |||
| KR20150131386A | 2015-11-24 | |||
| KR19980702926A | 1998-09-05 | |||
| JP2004149866A | 2004-05-27 |
Other References:
See also references of EP 4071263A4
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
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