Title:
HIGH-STRENGTH HOT-DIP GALVANIZED STEEL SHEET WITH EXCELLENT PLATING QUALITY, STEEL SHEET FOR PLATING, AND MANUFACTURING METHODS THEREFOR
Document Type and Number:
WIPO Patent Application WO/2022/124826
Kind Code:
A1
Abstract:
The present invention relates to: a high-strength hot-dip galvanized steel sheet with excellent plating quality; a steel sheet for plating, for manufacturing same; and manufacturing methods therefor. In a steel sheet for plating, according to one aspect of the present invention, the GDS profile of an Mn component, which is observed in the direction of surface to depth, sequentially comprises local maximum points and local minimum points, the difference (reduced concentration difference of Mn) between the value obtained by dividing the Mn concentration at the local maximum points by the Mn concentration of a base metal and the value obtained by dividing the Mn concentration at the local minimum points by the Mn concentration of the base metal can be 10% or higher, and the difference (reduced concentration difference of Si) between the value obtained by dividing the Si concentration at the local maximum points by the Si concentration of the base metal and the value obtained by dividing the Si concentration at the local minimum points by the Si concentration of the base metal can be 10% or higher. If local minimum points do not appear at a depth of 5 μm or less, local minimum points are considered to appear at a depth of 5 μm.
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/KR2021/018665
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; C25D5/50; C25D9/04
Foreign References:
| KR20130077907A | 2013-07-09 | |||
| KR20150061407A | 2015-06-04 | |||
| JP2008163388A | 2008-07-17 | |||
| KR20160048882A | 2016-05-04 | |||
| KR101304850B1 | 2013-09-05 | |||
| KR20100030627A | 2010-03-18 | |||
| KR20090006881A | 2009-01-15 |
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
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