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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 12516391 B1

PDFFull Text
Date of Patent:
Jan. 06, 2026

Filed:

Dec. 25, 2020

Stainless steel seamless pipe and method for manufacturing same

Applicant:

Jfe Steel Corporation, Tokyo, JP;

Inventors:

Shunsuke Sasaki, Tokyo, JP;

Masao Yuga, Tokyo, JP;

Tatsuro Katsumura, Tokyo, JP;

Hideo Kijima, Tokyo, JP;

Assignee:

JFE Steel Corporation, Tokyo, JP;

Attorney:

Buchanan Ingersoll & Rooney PC

Primary Examiner:

Jophy S Koshy

Int. Cl.
CPC ...
C21D 9/08 (2006.01); C21D 1/26 (2006.01); C21D 6/00 (2006.01); C21D 7/10 (2006.01); C21D 8/10 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/50 (2006.01); C22C 38/60 (2006.01); C22C 38/04 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01);
U.S. Cl.
CPC ...
C21D 6/004 (2013.01); C21D 1/26 (2013.01); C21D 7/10 (2013.01); C21D 8/10 (2013.01); C21D 8/105 (2013.01); C21D 9/08 (2013.01); C22C 38/001 (2013.01); C22C 38/02 (2013.01); C22C 38/50 (2013.01); C22C 38/60 (2013.01); C21D 2211/001 (2013.01); C21D 2211/005 (2013.01); C22C 38/00 (2013.01); C22C 38/04 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/48 (2013.01); Y02E 10/10 (2013.01);
Abstract

A stainless steel seamless pipe is provided that is a stainless steel comprising, in mass %, Cr: 11.5 to 35.0%, and Mo: 0.5 to 6.0%, and including ferrite and austenite, the stainless steel seamless pipe having a ferrite grain boundary and/or a ferrite-austenite grain boundary with a Mo concentration (mass %) that is at most 4.0 times the intragranular Mo concentration (mass %) of ferrite, or an austenite grain boundary with a Mo concentration (mass %) that is at most 4.0 times the intragranular Mo concentration (mass %) of austenite, the stainless steel seamless pipe having an axial tensile yield strength of 689 MPa or more, and an axial compressive yield strength/axial tensile yield strength ratio of 0.85 to 1.15.

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