Title:
STEEL SHEET HAVING GOOD PLATING QUALITY AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2023/239212
Kind Code:
A1
Abstract:
The present invention relates to a hot-dip galvanized steel sheet having excellent plating quality, a plating steel sheet for manufacturing same, and a manufacturing method therefor. A plating steel sheet according to an aspect of the present invention has the composition comprising, by wt%, 0.1 to 1.0% of Mn, 0.1% or less (exclusive of 0%) of Si, 0.0005 to 0.03% of C, 0.005 to 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 of Fe and inevitable impurities, wherein, when observed from the surface in the depth direction, the GDS profile of the Mn component and the GDS profile of the Si component each sequentially include a maximum and a minimum point; the difference between the concentration of Mn at the maximum point of the GDS profile for the Mn component divided by the concentration of Mn in the parent material and the concentration of Mn at the minimum point of the GDS profile for the Mn component divided by the concentration of Mn in the parent material (difference in equivalent concentration of Mn) is 80% or more; and the difference between the concentration of Si at the maximum point of the GDS profile for the Si component divided by the concentration of Si in the parent material and the concentration of Si at the minimum point of the GDS profile for the Si component divided by the concentration of Si in the parent material (difference in equivalent concentration of Si) is 50% or more. However, if the minimum point does not appear within 5 μm depth, the 5 μm depth point is considered the point where 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/KR2023/007975
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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