Title:
HIGH-STRENGTH HOT-DIP GALVANIZED STEEL SHEET HAVING EXCELLENT PLATING QUALITY, STEEL SHEET FOR PLATING, AND METHODS FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2022/124825
Kind Code:
A1
Abstract:
The present invention relates to a high-strength hot-dip galvanized steel sheet having excellent plating quality, a steel sheet for plating for manufacturing same, and methods for manufacturing the steel sheets. The steel sheet for plating according to an aspect of the present invention has a GDS profile of an Mn component, as observed in the depth direction from the surface, sequentially including a maximum point and a minimum point, wherein a difference (a converted concentration difference of Mn) between a value, obtained by dividing the concentration of Mn at the maximum point by the concentration of Mn of a base material, and a value, obtained by dividing the concentration of Mn at the minimum point by the concentration of Mn of the base material, may be 80% or more, and a difference (a converted concentration difference of Si) between a value, obtained by dividing the concentration of Si at the maximum point by the concentration of Si of the base material, and a value, obtained by dividing the concentration of Si at the minimum point by the concentration of Si of the base material, may be 50% or more. However, when no minimum point appears within a depth of 5 µm, a point at a depth of 5 µm is denoted as the point at which the minimum point appears.
Inventors:
JUNG JIN-HO (KR)
LEE WON-HWI (KR)
KANG KI-CHEOL (KR)
KWON SEONG-CHOON (KR)
LEE WON-HWI (KR)
KANG KI-CHEOL (KR)
KWON SEONG-CHOON (KR)
Application Number:
PCT/KR2021/018661
Publication Date:
June 16, 2022
Filing Date:
December 09, 2021
Export Citation:
Assignee:
POSCO (KR)
International Classes:
C22C38/38; C22C38/34; C23C2/06; C23C28/02; C25D3/20; C25D5/36; C25D5/50; C25D7/06
Foreign References:
| KR20130077907A | 2013-07-09 | |||
| KR20150061407A | 2015-06-04 | |||
| JP2008163388A | 2008-07-17 | |||
| KR20160048882A | 2016-05-04 | |||
| KR20190073200A | 2019-06-26 | |||
| KR20100030627A | 2010-03-18 | |||
| KR20090006881A | 2009-01-15 |
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
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