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:
May. 14, 2013
Filed:
Jul. 26, 2010
Shinsuke Ide, Tokyo, JP;
Atsutaka Honda, Tokyo, JP;
Shin Ishikawa, Tokyo, JP;
Takumi Ujiro, Tokyo, JP;
Shinsuke Ide, Tokyo, JP;
Atsutaka Honda, Tokyo, JP;
Shin Ishikawa, Tokyo, JP;
Takumi Ujiro, Tokyo, JP;
JFE Steel Corporation, Tokyo, JP;
Abstract
A stainless steel having good conductivity and ductility for use in a fuel cell separator is provided. In particular, the stainless steel has a composition of, in terms of % by mass, C: 0.01% or less, Si: 1.0% or less, Mn: 1.0% or less, S: 0.01% or less, P: 0.05% or less, Al: 0.20% or less, N: 0.02% or less, Cr: 20 to 40%, Mo: 4.0% or less, and at least one selected from Nb, Ti, and Zr: 0.05 to 0.60% in total, the balance being Fe and unavoidable impurities. At least one precipitate having an equivalent circle diameter of 0.1 μm or more is present per 100 μm, a ratio of a thickness t (μm) to a maximum diameter Dmax (μm) of the precipitates satisfies formula (1) below20≦max  (1)and the thickness is 200 μm or less.