Title:
SURFACE-TREATED STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2024/071189
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing a surface-treated steel sheet that particularly improves resistance to surface contact scratch caused by contact between one surface and the other surface as a further improvement in scratch resistance, and that has excellent corrosion resistance. The surface-treated steel sheet has, on either surface thereof, a plating layer, a first coloring membrane layer, and a second coloring membrane layer. The ratio of the film thickness of the second coloring membrane layer to the film thickness of the first coloring membrane layer is between 0.1 and 0.5 inclusive. The first coloring membrane layer and the second coloring membrane layer contain resin particles. The proportion of the number of the resin particles having a thickness greater than or equal to the film thickness of the first coloring membrane layer is between 1% and 30% inclusive. The proportion of the number of the resin particles having a thickness greater than or equal to the film thickness of the second coloring membrane layer is between 50% and 100% inclusive.
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Inventors:
HIRAI AKIKO (JP)
KAWAMURA YASUAKI (JP)
FUJII TAKASHI (JP)
TOSHIN KUNIHIKO (JP)
KAWAMURA YASUAKI (JP)
FUJII TAKASHI (JP)
TOSHIN KUNIHIKO (JP)
Application Number:
PCT/JP2023/035131
Publication Date:
April 04, 2024
Filing Date:
September 27, 2023
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
B32B15/08; C23C28/00
Domestic Patent References:
WO2014112544A1 | 2014-07-24 |
Foreign References:
JPH09187881A | 1997-07-22 | |||
JP2017061750A | 2017-03-30 |
Attorney, Agent or Firm:
HAGIWARA, Yasushi et al. (JP)
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