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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 9631249 B1

PDFFull Text
Date of Patent:
Apr. 25, 2017

Filed:

Oct. 22, 2012

Stainless steel and method for manufacturing same

Applicant:

Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;

Inventors:

Kazuhiko Adachi, Tokyo, JP;

Takashi Maeda, Tokyo, JP;

Masayuki Shibuya, Tokyo, JP;

Kazuyoshi Fujisawa, Tokyo, JP;

Yuuichi Fukumura, Tokyo, JP;

Assignee:

NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;

Attorney:

Clark & Brody

Primary Examiner:

Jessee Roe

Assistant Examiner:

Nicholas Wang

Int. Cl.
CPC ...
C21D 8/00 (2006.01); B21B 3/02 (2006.01); C21D 9/46 (2006.01); C22C 38/38 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/20 (2006.01); C22C 38/24 (2006.01); C22C 38/26 (2006.01); C22C 38/28 (2006.01); C22C 38/40 (2006.01); C21D 6/00 (2006.01); C21D 1/18 (2006.01); C22C 38/34 (2006.01); C22C 38/42 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01); C21D 8/02 (2006.01);
U.S. Cl.
CPC ...
C21D 8/005 (2013.01); B21B 3/02 (2013.01); C21D 1/18 (2013.01); C21D 1/185 (2013.01); C21D 6/002 (2013.01); C21D 8/0247 (2013.01); C21D 9/46 (2013.01); C22C 38/001 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/20 (2013.01); C22C 38/24 (2013.01); C22C 38/26 (2013.01); C22C 38/28 (2013.01); C22C 38/34 (2013.01); C22C 38/38 (2013.01); C22C 38/40 (2013.01); C22C 38/42 (2013.01); C22C 38/46 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C21D 8/0226 (2013.01); C21D 8/0236 (2013.01); C21D 2211/005 (2013.01); C21D 2211/008 (2013.01);
Abstract

Martensitic mixed phase stainless steel, which has in well balance between excellent strength and formability and excellent fatigue properties, and is inexpensive, and suitable for spring members, has: a chemical composition comprising C: 0.1-0.4%, Si: at most 2.0%, Mn: 0.1-6.0%, Cr: 10.0-28.0%, N: at most 0.17%, the remainder of Fe and impurities, and a metallurgical structure which includes a ferrite phase and a martensitic phase, and also a retained austenite phase of 5 volume % or less if necessary, and which satisfies a relationship of C/C≧5.0 where an average value Cof C content existing in the ferrite phase, and an average value Cof C content existing in the martensite.

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