The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 30, 2025
Filed:
Mar. 29, 2022
Nippon Steel Corporation, Tokyo, JP;
NIPPON STEEL CORPORATION, Tokyo, JP;
Abstract
A surface-treated steel sheet including a steel sheet, a zinc-based plated layer, and a chemical conversion treatment layer that contains Si, C, O and P, and has a C concentration of 20.0 mass % or more, an O concentration of 15.0 mass % or more, a Si concentration of 10.0 mass % or more, and a P concentration of 0.10 mass % or more. When t is a thickness of the chemical conversion treatment layer, an area from a surface to a position of t/10 from the surface is a surface layer region, an area from the position of 9t/10 from the surface to an interface between the treatment layer and the plated layer is an interface side region, and a region sandwiched therebetween is an intermediate region. A maximum value of a P concentration of the surface layer region is 1.5 times to 5.0 times the average P concentration of an intermediate region.