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:
Jan. 28, 2020
Filed:
Jul. 29, 2015
Applicant:
Nippon Steel & Sumikin Stainless Steel Corporation, Tokyo, JP;
Inventors:
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C22C 38/38 (2006.01); C21D 1/76 (2006.01); H01M 8/06 (2016.01); H01M 8/12 (2016.01); C21D 6/00 (2006.01); C22C 38/60 (2006.01); C22C 38/00 (2006.01); C22C 38/22 (2006.01); C22C 38/20 (2006.01); C22C 38/24 (2006.01); C22C 38/18 (2006.01); C22C 38/04 (2006.01); C22C 38/14 (2006.01); C22C 38/12 (2006.01); C21D 9/46 (2006.01); C22C 38/02 (2006.01); C22C 38/06 (2006.01); C22C 38/28 (2006.01);
U.S. Cl.
CPC ...
C22C 38/38 (2013.01); C21D 1/76 (2013.01); C21D 6/00 (2013.01); C21D 6/002 (2013.01); C21D 9/46 (2013.01); C22C 38/00 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/005 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/12 (2013.01); C22C 38/14 (2013.01); C22C 38/18 (2013.01); C22C 38/20 (2013.01); C22C 38/22 (2013.01); C22C 38/24 (2013.01); C22C 38/28 (2013.01); C22C 38/60 (2013.01); H01M 8/06 (2013.01); H01M 8/12 (2013.01);
Abstract
A ferritic stainless steel for a fuel cell includes, in mass %, Cr: 11 to 25%, C: 0.03% or less, Si: 2% or less, Mn: 2% or less, Al: 0.5 to 4.0%, P: 0.05% or less, S: 0.01% or less, N: 0.03% or less, Ti: 1% or less, and a balance composed of Fe and unavoidable impurities. Furthermore, in the ferritic stainless steel, the maximal concentration of Al in a surface of the ferritic stainless steel is 30 mass % or more in cation ion fraction excepting O in an depth direction region having twice a thickness of an oxide film having less than 0.1 μm.