Title:
SURFACE-TREATED STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2024/075840
Kind Code:
A1
Abstract:
This surface-treated steel sheet has a base material steel sheet, a plating layer, a first coating, and a second coating. The plating layer has a Zn concentration of 40%-100% and a Mg concentration of 0% or more and less than 4.0%. The following items satisfy a predetermined relationship: the maximum concentration of Ti, the maximum concentration of Zr, and the maximum concentration of V in the interval from a first interface to the center of the the first coating film in the thickness direction of the first interface and a second interface; the average concentration of C in the central section of the first coating; the average concentration of C in the central section of the second coating; the maximum concentration of Mg in a border area of the first coating; the average concentration of Mg in the central section of the first coating; the maximum concentration of F in the border area of the first coating; the average concentration of F in the central section of the first coating; the average concentration of Si in the central section of the first coating; the average concentration of Zn in the central section of the first coating; and the average concentration of Zn in the central section of the second coating.
Inventors:
NISHIDA YOSHIKATSU (JP)
SHOJI HIROMASA (JP)
SHOJI HIROMASA (JP)
Application Number:
PCT/JP2023/036561
Publication Date:
April 11, 2024
Filing Date:
October 06, 2023
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
B32B15/01; C23C22/00; C23C22/36
Domestic Patent References:
| WO2020189769A1 | 2020-09-24 |
Foreign References:
| JP2019042717A | 2019-03-22 | |||
| KR20200096281A | 2020-08-11 | |||
| JP2012180591A | 2012-09-20 |
Attorney, Agent or Firm:
MATSUNUMA Yasushi et al. (JP)
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