Title:
STEEL SHEET HAVING EXCELLENT PLATING QUALITY AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2023/239211
Kind Code:
A1
Abstract:
The present invention relates to a hot-dip galvanized steel sheet having excellent plating quality, a steel sheet for plating for producing same, and a method for manufacturing same. A steel sheet for plating according to one aspect of the present invention comprises, in weight percent: 0.1-1.0% of Mn; 0.1% or less of Si (excluding 0%); 0.0005-0.03% of C; 0.005-3.0% of Al; 0.04% or less of P; 0.015% or less of S; 1.5% or less of Cr; 0.005% or less of B, and the balance being Fe and inevitable impurities, wherein each of a GDS profile of the Mn component and a GDS profile of the Si component, which are observed from the surface to the depth, sequentially includes a maximum point and a minimum point, the difference (the reduced concentration difference of Mn) between a value obtained by dividing the Mn concentration at the maximum point in the GDS profile of the Mn component by the Mn concentration of a base material, and a value obtained by dividing the Mn concentration at the minimum point in the GDS profile of the Mn component by the Mn concentration of the base material may be 10% or greater, and the difference (the reduced concentration difference of Si) between a value obtained by dividing the Si concentration at the maximum point in the GDS profile of the Si component by the Si concentration of the base material, and a value obtained by dividing the Si concentration at the minimum point in the GDS profile of the Si component by the Si concentration of the base material may be 10% or greater. If no minimum points appear within 5 μm in depth, a point at a depth of 5 μm is considered to be the point at which the minimum point appears.
Inventors:
JUNG JIN-HO (KR)
LEE WON-HWI (KR)
KWON SEONG-CHOON (KR)
KANG KI-CHEOL (KR)
HAN SEONG-HO (KR)
LEE JAE-HOON (KR)
CHOI YONG-HOON (KR)
LEE WON-HWI (KR)
KWON SEONG-CHOON (KR)
KANG KI-CHEOL (KR)
HAN SEONG-HO (KR)
LEE JAE-HOON (KR)
CHOI YONG-HOON (KR)
Application Number:
PCT/KR2023/007974
Publication Date:
December 14, 2023
Filing Date:
June 09, 2023
Export Citation:
Assignee:
POSCO CO LTD (KR)
International Classes:
C23C28/00; C23C2/06; C23C2/40; C23C28/02; C25D3/20; C25D5/50; C25D7/06; C25D9/04; C25D9/06
Domestic Patent References:
| WO2021166350A1 | 2021-08-26 |
Foreign References:
| KR20130077907A | 2013-07-09 | |||
| KR20150061407A | 2015-06-04 | |||
| JP2704045B2 | 1998-01-26 | |||
| JP2000309824A | 2000-11-07 | |||
| KR20070050497A | 2007-05-15 |
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
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