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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 9512509 B1

PDFFull Text
Date of Patent:
Dec. 06, 2016

Filed:

Mar. 06, 2012

Duplex stainless steel

Applicant:

Shinnosuke Kurihara, Amagasaki, JP;

Inventor:

Shinnosuke Kurihara, Amagasaki, JP;

Assignee:

NIPPON STEEL & SUMITOMO METAL CORPORTION, Tokyo, JP;

Attorney:

Clark & Brody

Primary Examiner:

Scott Kastler

Assistant Examiner:

Vanessa Luk

Int. Cl.
CPC ...
C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/58 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/54 (2006.01); C21D 6/00 (2006.01); C21D 9/46 (2006.01); C22C 38/08 (2006.01); C22C 38/16 (2006.01); C22C 38/18 (2006.01); C22C 38/20 (2006.01); C22C 38/22 (2006.01); C22C 38/40 (2006.01);
U.S. Cl.
CPC ...
C22C 38/58 (2013.01); C21D 6/004 (2013.01); C21D 9/46 (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 38/08 (2013.01); C22C 38/16 (2013.01); C22C 38/18 (2013.01); C22C 38/20 (2013.01); C22C 38/22 (2013.01); C22C 38/40 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/54 (2013.01); C21D 2211/001 (2013.01); C21D 2211/005 (2013.01);
Abstract

A duplex stainless steel containing, by mass %: C: not more than 0.03%, Si: not more than 0.3%, Mn: not more than 3.0%, P: not more than 0.040%, S: not more than 0.008%, Cu: 0.2 to 2.0%, Ni: 5.0 to 6.5%, Cr: 23.0 to 27.0%, Mo: 2.5 to 3.5%, W: 1.5 to 4.0%, and N: 0.24 to 0.40%, the balance being Fe and impurities, wherein a σ phase susceptibility index X (=2.2Si+0.5Cu+2.0Ni+Cr+4.2Mo+0.2W) is not more than 52.0; a strength index Y (=Cr+1.5Mo+10N+3.5W) is not less than 40.5; and a pitting resistance equivalent PREW (=Cr+3.3(Mo+0.5W)+16N) is not less than 40. This duplex stainless steel is excellent in corrosion resistance and embrittlement cracking resistance.

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