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:
Jun. 17, 2025
Filed:
Jan. 20, 2021
Jfe Steel Corporation, Tokyo, JP;
Shunsuke Sasaki, Tokyo, JP;
Masao Yuga, Tokyo, JP;
Tatsuro Katsumura, Tokyo, JP;
Hideo Kijima, Tokyo, JP;
JFE Steel Corporation, Tokyo, JP;
Abstract
A stainless steel pipe of a predetermined composition is provided that comprises N, Ti, Al, V, and Nb so as to satisfy the predetermined formula, the stainless steel pipe having an axial tensile yield strength of 757 MPa or more, an axial compressive yield strength/axial tensile yield strength ratio of 0.85 to 1.15, and a microstructure that is 20 to 80% ferrite phase by volume with the remainder containing an austenite phase, the stainless steel pipe having pipe end portions at least one of which has a fastening portion for an external thread or an internal thread, and having a curvature radius of 0.2 mm or more for a corner R formed by a bottom surface of a thread root and a pressure-side flank surface of the thread, measured in an axial plane section of the fastening portion.