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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 11248297 B1

PDFFull Text
Date of Patent:
Feb. 15, 2022

Filed:

Jan. 08, 2019

Austenitic heat resistant alloy and method for producing same, and austenitic heat-resistant alloy material

Applicant:

Nippon Steel Corporation, Tokyo, JP;

Inventors:

Takumi Nishimoto, Tokyo, JP;

Yoshitaka Nishiyama, Tokyo, JP;

Assignee:

NIPPON STEEL CORPORATION, Tokyo, JP;

Attorney:

Greer, Burns & Crain, Ltd.

Primary Examiner:

Humera N Sheikh

Assistant Examiner:

Katherine A Christy

Int. Cl.
CPC ...
C23C 22/34 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/44 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01); C22C 38/54 (2006.01); C22C 38/58 (2006.01); C22C 38/52 (2006.01); C23C 22/78 (2006.01);
U.S. Cl.
CPC ...
C23C 22/34 (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 38/06 (2013.01); C22C 38/44 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C22C 38/52 (2013.01); C22C 38/54 (2013.01); C22C 38/58 (2013.01); C23C 22/78 (2013.01);
Abstract

Provided are an austenitic heat resistant alloy capable of exhibiting sufficient molten-salt corrosion resistance even when exposed to a molten salt of 600° C. and a production method thereof, and an austenitic heat-resistant alloy material. An austenitic heat resistant alloy includes a base metal, and a Ni—Fe oxide having a spinel structure on or above the surface of the base metal. The base metal has a chemical composition consisting of, in mass %, C: 0.030 to 0.120%, Si: 0.02 to 1.00%, Mn: 0.10 to 2.00%, Cr: 20.0% or more to less than 28.0%, Ni: more than 35.0% to 50.0% or less, W: 4.0 to 10.0%, Ti: 0.01 to 0.30%, Nb: 0.01 to 1.00%, sol. Al: 0.0005 to 0.0400%, B: 0.0005 to 0.0100%, Mo: less than 0.5%, Co: 0 to 0.80%, and Cu: 0 to 0.50%, with the balance being Fe and impurities.

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