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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 11053562 B1

PDFFull Text
Date of Patent:
Jul. 06, 2021

Filed:

Oct. 19, 2016

Dispersion strengthened austenitic stainless steel article, method for manufacturing same and product made of same

Applicant:

Hitachi, Ltd., Tokyo, JP;

Inventors:

Takahiro Ishizaki, Tokyo, JP;

Yusaku Maruno, Tokyo, JP;

Assignee:

HITACHI, LTD., Tokyo, JP;

Attorney:

Mattingly & Malur, PC

Primary Examiner:

Anthony J Zimmer

Assistant Examiner:

Jacob James Gusewelle

Int. Cl.
CPC ...
B22F 1/00 (2006.01); B22F 3/10 (2006.01); B22F 3/15 (2006.01); B22F 3/24 (2006.01); B22F 9/04 (2006.01); C21D 6/00 (2006.01); C21D 6/02 (2006.01); C21D 9/00 (2006.01); C22C 32/00 (2006.01); C22C 33/02 (2006.01); C22C 38/00 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); G21C 21/18 (2006.01); G21C 7/10 (2006.01); B22F 3/20 (2006.01);
U.S. Cl.
CPC ...
C21D 9/0068 (2013.01); B22F 3/10 (2013.01); B22F 3/24 (2013.01); B22F 9/04 (2013.01); C21D 6/004 (2013.01); C21D 6/02 (2013.01); C22C 32/0026 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/004 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); G21C 7/10 (2013.01); G21C 21/18 (2013.01); B22F 1/0014 (2013.01); B22F 3/15 (2013.01); B22F 3/20 (2013.01); B22F 2003/247 (2013.01); B22F 2003/248 (2013.01); B22F 2301/35 (2013.01); B22F 2304/15 (2013.01); B22F 2998/10 (2013.01); C21D 2211/001 (2013.01); C22C 33/0285 (2013.01);
Abstract

An objective of the invention is to provide an austenitic stainless steel article having superior irradiation resistance and stress corrosion cracking resistance than before while maintaining mechanical properties equivalent to those of conventional ones. There is provided a dispersion strengthened austenitic stainless steel article, including: 16-26 mass % of Cr; 8-22 mass % of Ni; 0.005-0.08 mass % of C; 0.002-0.1 mass % of N; 0.02-0.4 mass % of O; at least one of 0.2-2.8 mass % of Zr, 0.4-5 mass % of Ta, and 0.2-2.6 mass % of Ti; and a balance consisting of Fe and inevitable impurities. The Zr, Ta and Ti components form inclusion particles in the stainless steel article by combining with the C, N and O components. The stainless steel article has an average grain size of 1 μm or less and a maximum grain size of 5 μm or less.

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