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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 11268177 B1

PDFFull Text
Date of Patent:
Mar. 08, 2022

Filed:

Sep. 27, 2016

Austenitic stainless steel

Applicant:

Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;

Inventors:

Kazuhiko Adachi, Tokyo, JP;

Akihiro Nishimura, Tokyo, JP;

Shinichi Teraoka, Tokyo, JP;

Hideki Fujii, Tokyo, JP;

Assignee:

NIPPON STEEL CORPORATION, Tokyo, JP;

Attorney:

Clark & Brody LP

Primary Examiner:

Sally A Merkling

Assistant Examiner:

Danielle Carda

Int. Cl.
CPC ...
C22C 38/50 (2006.01); C22C 38/00 (2006.01); C23C 8/26 (2006.01); C23C 8/02 (2006.01); C22C 38/58 (2006.01); C22C 38/40 (2006.01); C21D 6/00 (2006.01); C21D 9/56 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); C21D 1/76 (2006.01); C21D 8/02 (2006.01);
U.S. Cl.
CPC ...
C22C 38/50 (2013.01); C21D 6/004 (2013.01); C21D 9/561 (2013.01); C22C 38/00 (2013.01); C22C 38/001 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/40 (2013.01); C22C 38/46 (2013.01); C22C 38/48 (2013.01); C22C 38/58 (2013.01); C23C 8/02 (2013.01); C23C 8/26 (2013.01); C21D 1/76 (2013.01); C21D 8/0278 (2013.01); C21D 2211/001 (2013.01);
Abstract

An austenitic stainless steel according to the present invention has a chemical composition containing, by mass %: C: 0.01 to 0.15%; Si: 2.0% or less; Mn: 3.0% or less; Cr: 10.0 to 20.0%; Ni: 5.0 to 13.0%; N: 0.01 to 0.30%; Nb: 0 to 0.5%; Ti: 0 to 0.5%; and V: 0 to 0.5%, with the balance: Fe and impurities, wherein an average grain size is 10.0 μm or less, a difference in value of an average lattice constant d(={d×I+d×I+d×I+d×I}/{I+I+I+I}) of an austenite phase between a surface portion and a center portion is 0.010 Å or more, and a value of a diffraction peak integrated intensity ratio r (=100×ΣI/ΣI) at a surface is 95% or more.

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