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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 9074271 B1

PDFFull Text
Date of Patent:
Jul. 07, 2015

Filed:

Mar. 29, 2011

Dual-phase stainless steel sheet and steel strip and method of production

Applicants:

Shinichi Teraoka, Tokyo, JP;

Shunji Sakamoto, Tokyo, JP;

Inventors:

Shinichi Teraoka, Tokyo, JP;

Shunji Sakamoto, Tokyo, JP;

Assignee:

NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATION, Tokyo, JP;

Attorney:

Kenyon & Kenyon LLP

Primary Examiner:

Deborah Yee

Int. Cl.
CPC ...
C22C 38/40 (2006.01); C22C 38/42 (2006.01); C22C 38/54 (2006.01); C21D 8/00 (2006.01); C21D 9/00 (2006.01); C22C 38/00 (2006.01); C21D 6/00 (2006.01); C21D 8/02 (2006.01); C21D 9/46 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/58 (2006.01); C22C 38/44 (2006.01); C21D 6/02 (2006.01);
U.S. Cl.
CPC ...
C22C 38/001 (2013.01); C21D 6/004 (2013.01); C21D 6/005 (2013.01); C21D 6/02 (2013.01); C21D 8/0226 (2013.01); C21D 8/0236 (2013.01); C21D 8/0242 (2013.01); C21D 8/0273 (2013.01); C21D 9/46 (2013.01); C21D 2211/005 (2013.01); C21D 2211/008 (2013.01); C22C 38/008 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/40 (2013.01); C22C 38/54 (2013.01); C22C 38/58 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01);
Abstract

High strength dual-phase stainless steel sheet and steel strip which are excellent in corrosion resistance, the dual-phase stainless steel sheet and steel strip having a Vicker's hardness of 200HV or more and comprising, by mass %, C: 0.02 to 0.20%, Si: 0.10 to 2.0%, Mn: 0.20 to 2.0%, P: 0.040% or less, S: 0.010% or less, Cr: 15.0 to 18.0%, Ni: 0.5 to 4.0%, Sn: 0.05 to 0.50, N: 0.010 to 0.10%, and a balance of Fe and unavoidable impurities. The dual-phase stainless steel sheet and steel strip have a γp range of 60 to 95, and a ferrite and martensite dual-phase microstructure formed by being heated to the ferrite and austenite dual-phase region, then the austenite phase transforming to martenite in the subsequent cooling process, wherein γp=420C+470N+23Ni+7Mn+9Cu−11.5Cr−11.5Si−12Mo−7Sn−49Ti−47Nb−52Al+189.

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