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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.:

US 11535915 B1

PDFFull Text
Date of Patent:
Dec. 27, 2022

Filed:

Mar. 27, 2018

Stainless steel material, constituting component, cell, and fuel cell stack

Applicant:

Nippon Steel Stainless Steel Corporation, Tokyo, JP;

Inventors:

Takumi Nishimoto, Tokyo, JP;

Yoshio Tarutani, Tokyo, JP;

Assignee:

NIPPON STEEL STAINLESS STEEL CORPORATION, Tokyo, JP;

Attorney:

Birch, Stewart, Kolasch & Birch, LLP

Primary Examiner:

Humera N Sheikh

Assistant Examiner:

Katherine A Christy

Int. Cl.
CPC ...
C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); H01M 8/021 (2016.01); H01M 8/0228 (2016.01); H01M 8/12 (2016.01); C22C 38/54 (2006.01); C21D 6/00 (2006.01); C21D 8/02 (2006.01); C21D 9/46 (2006.01); C22C 38/00 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01); C22C 38/52 (2006.01);
U.S. Cl.
CPC ...
C22C 38/54 (2013.01); C21D 6/004 (2013.01); C21D 6/005 (2013.01); C21D 6/007 (2013.01); C21D 6/008 (2013.01); C21D 8/0226 (2013.01); C21D 9/46 (2013.01); C22C 38/002 (2013.01); C22C 38/005 (2013.01); C22C 38/008 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C22C 38/52 (2013.01); H01M 8/021 (2013.01); H01M 8/0228 (2013.01); H01M 8/12 (2013.01); H01M 2008/1293 (2013.01);
Abstract

A stainless steel material including a base material made of ferritic stainless steel, a Cr oxide layer formed on a surface of the base material, and a spinel oxide layer formed on a surface of the Cr oxide layer, wherein a chemical composition of the base material satisfies [16.0≤Cr+3×Mo−2.5×B−17×C−3−Si≤35.0], a thickness of the Cr oxide layer (T) and a thickness of the spinel oxide layer (T) satisfy [0.55≤T/T≤6.7], the base material contains precipitate including one or more kinds selected from a MC, a MB, a complex precipitate in which MB acts as a precipitation nucleus, and MCprecipitates on a surface of the MB, and a complex precipitate in which NbC acts as a precipitation nucleus, and MCprecipitates on a surface of the NbC, and a part of the precipitate protrude from the surface of the Cr oxide layer.

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