Title:
HIGH-STRENGTH HOT-DIP GALVANIZED STEEL SHEET HAVING GOOD PLATING QUALITY, STEEL SHEET FOR PLATING, AND METHODS FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2023/239208
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 to manufacture same, and methods for manufacturing same. The steel sheet for plating, according to an aspect of the present invention, comprises, by weight%, 1.0-8.0 % of Mn, 0.05-3 % of Si, 0.06-0.4 % 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 remainder of Fe and inevitable impurities, wherein each of a GDS profile of a Mn component and a GDS profile of a Si component, which are observed from the surface in the depth direction, sequentially includes a maximum point and a minimum point, wherein the difference (converted 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 80 % or greater, and the difference (converted 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 50 % or greater. Here, in a case where no minimum points appear within 5 μm in depth, the 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)
JUNG KI-TAEK (KR)
KIM EUN-YOUNG (KR)
LEE WON-HWI (KR)
KWON SEONG-CHOON (KR)
KANG KI-CHEOL (KR)
JUNG KI-TAEK (KR)
KIM EUN-YOUNG (KR)
Application Number:
PCT/KR2023/007971
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 | |||
| JP2000309824A | 2000-11-07 | |||
| KR20070050497A | 2007-05-15 |
Attorney, Agent or Firm:
C&S PATENT AND LAW OFFICE (KR)
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