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.:
Date of Patent:
Mar. 07, 2023
Filed:
Sep. 23, 2019
Applicant:
Japan Atomic Energy Agency, Ibaraki, JP;
Inventors:
Noriaki Hirota, Ibaraki, JP;
Tomoaki Takeuchi, Ibaraki, JP;
Hiroko Nakano, Ibaraki, JP;
Atsushi Kikuchi, Tokyo, JP;
Assignee:
JAPAN ATOMIC ENERGY AGENCY, Ibaraki, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C22C 38/02 (2006.01); C21D 9/46 (2006.01); C22C 38/44 (2006.01); C22C 38/04 (2006.01); C21D 6/00 (2006.01); C21D 8/02 (2006.01);
U.S. Cl.
CPC ...
C21D 9/46 (2013.01); C21D 6/004 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/0205 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/44 (2013.01);
Abstract
A process of producing a fine-grained austenitic stainless steel, the process comprising a step of subjecting a fine-grained austenitic stainless steel comprising: C: 0.15 wt % or less, Si: 1.00 wt % or less, Mn: 2.0 wt % or less, Ni: 6.0 to 14.0 wt %, Cr: 16.0 to 22.0 wt %, and Mo: 3.0 wt % or less, with the balance being Fe and inevitable impurities, and having an average grain size of 10 μm or lower, to an annealing treatment at a temperature from 600° C. to 700° C. for 48 hours or longer.