Title:
SURFACE-TREATED STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2024/075833
Kind Code:
A1
Abstract:
This surface-treated steel sheet comprises: a base-material steel sheet; a plating layer formed on a surface of the base-material steel sheet; and a coating film formed on a surface of the plating layer. The plating layer has a Zn concentration between 40 mass% and 100 mass% inclusive, and has an Mg concentration between 0 mass% and less than 4.0 mass%. Between the interface and the center in the thickness direction between the interface and the surface, a maximum concentration of Ti in mass%, a maximum concentration of Zr in mass%, and a maximum concentration of V in mass% satisfy a predetermined relationship. In addition, an average concentration of C in mass% at the central part of the coating film, a maximum concentration of Mg in mass% in the boundary region of the coating film, an average concentration of Mg in mass% at the central part of the coating film, a maximum concentration of F in mass% in the boundary region of the coating film, an average concentration of F in mass% at the central part of the coating film, and an average concentration of Si in mass% at the central part of the coating film satisfy a predetermined relationship.
Inventors:
NISHIDA YOSHIKATSU (JP)
SHOJI HIROMASA (JP)
SHOJI HIROMASA (JP)
Application Number:
PCT/JP2023/036512
Publication Date:
April 11, 2024
Filing Date:
October 06, 2023
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
B32B15/01; C23C22/36
Attorney, Agent or Firm:
MATSUNUMA Yasushi et al. (JP)
Download PDF: