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:
Apr. 14, 2026
Filed:
Aug. 24, 2022
Nippon Steel Stainless Steel Corporation, Tokyo, JP;
NIPPON STEEL STAINLESS STEEL CORPORATION, Tokyo, JP;
Abstract
The present invention has an object to provide a ferritic stainless steel having a broad range of suitable quenching temperature and a high hardness and excellent corrosion resistance after quenching and beautiful and useful as a material for martensitic stainless steel products and provide an industrially stable method for production. The ferritic stainless steel of the present invention is characterized by having a steel composition comprising, by mass %, C: 0.45% or more and 0.55% or less, Si: 0.10% or more and 1.00% or less, Mn: 0.1% or more and 1.0% or less, Cr: 12.0% or more and 15.0% or less, Ni: 0% or more and 1.0% or less, Mo: 0.50% or more and 0.80% or less, V: 0.10% or more and 0.20% or less, N: 0.015% or more and 0.100% or less, P: 0% or more and 0.040% or less, S: 0% or more and 0.030% or less, balance: Fe and impurities, having an average crystal grain size of a ferrite phase of 10 μm or less, and having carbides having a diameter of 1.5 μm or less of 0.8/μmor more.