Title:
GALVANIZED STEEL SHEET HAVING EXCELLENT SURFACE QUALITY AND SPOT WELDABILITY, AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2021/112584
Kind Code:
A1
Abstract:
The present invention relates to a galvanized steel sheet having excellent surface quality and spot weldability, and a manufacturing method therefor. A galvanized steel sheet according to one aspect of the present invention comprises a base steel sheet and a zinc-based plated 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 (local maximum - local minimum) between the oxygen concentration (local minimum) at the local minimum point and the oxygen concentration (local maximum) at the local maximum point can be 0.1 wt% or more.
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Inventors:
KANG KI-CHEOL (KR)
UHM SANG-HO (KR)
LEE CHUNG-HWAN (KR)
UHM SANG-HO (KR)
LEE CHUNG-HWAN (KR)
Application Number:
PCT/KR2020/017537
Publication Date:
June 10, 2021
Filing Date:
December 03, 2020
Export Citation:
Assignee:
POSCO (KR)
International Classes:
C23C2/06; C21D8/02; C22C38/00; C22C38/02; C22C38/04; C22C38/34; C22C38/38; C23C2/02; C23C2/28; C23C2/40
Foreign References:
| KR20150131386A | 2015-11-24 | |||
| KR20190073200A | 2019-06-26 | |||
| KR101630976B1 | 2016-06-16 | |||
| JP2012041597A | 2012-03-01 | |||
| CN109023133A | 2018-12-18 |
Other References:
See also references of EP 4071264A4
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
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