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:
Jul. 07, 2026
Filed:
Nov. 02, 2021
Applicant:
Jfe Steel Corporation, Tokyo, JP;
Inventors:
Hiroshi Okano, Tokyo, JP;
Kazuki Matsubara, Tokyo, JP;
Shusaku Takagi, Tokyo, JP;
Nobuyuki Ishikawa, Tokyo, JP;
Assignee:
JFE STEEL CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16L 9/02 (2006.01); B23G 1/02 (2006.01); F16L 15/00 (2006.01);
U.S. Cl.
CPC ...
F16L 9/02 (2013.01); B23G 1/02 (2013.01); F16L 15/006 (2013.01);
Abstract
To alleviate stress exerted on a thread portion of a threaded steel pipe or tube during use to prevent fatigue fracture, there is provided a threaded steel pipe or tube having a female thread portion on an inner peripheral surface of at least one end, wherein a maximum value of residual compressive stress at a position of 0.4 mm in a depth direction from a thread bottom of the female thread portion is 100 MPa or more and less than or equal to tensile strength of a material of the threaded steel pipe or tube.