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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 11512361 B1

PDFFull Text
Date of Patent:
Nov. 29, 2022

Filed:

Dec. 26, 2018

Electric resistance welded steel pipe or tube and production method for electric resistance welded steel pipe or tube

Applicants:

Jfe Steel Corporation, Tokyo, JP;

Jfe Welded Pipe Manufacturing Co., Ltd., Tokyo, JP;

Inventors:

Yoshikazu Kawabata, Tokyo, JP;

Makio Gunji, Tokyo, JP;

Assignees:

JFE STEEL CORPORATION, Tokyo, JP;

JFE Welded Pipe Manufacturing Co., Ltd., Tokyo, JP;

Attorney:

Kenja IP Law PC

Primary Examiner:

Jenny R Wu

Int. Cl.
CPC ...
C21D 9/08 (2006.01); B23K 11/087 (2006.01); B23K 31/12 (2006.01); C21D 1/28 (2006.01); C21D 6/00 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/06 (2006.01); C22C 38/08 (2006.01); C22C 38/20 (2006.01); C22C 38/24 (2006.01); C22C 38/28 (2006.01); C22C 38/32 (2006.01); C22C 38/38 (2006.01); B23K 103/04 (2006.01); B23K 101/06 (2006.01);
U.S. Cl.
CPC ...
C21D 9/08 (2013.01); B23K 11/0873 (2013.01); B23K 31/12 (2013.01); C21D 1/28 (2013.01); C21D 6/001 (2013.01); C21D 6/002 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/06 (2013.01); C22C 38/08 (2013.01); C22C 38/20 (2013.01); C22C 38/24 (2013.01); C22C 38/28 (2013.01); C22C 38/32 (2013.01); C22C 38/38 (2013.01); B23K 2101/06 (2018.08); B23K 2103/04 (2018.08);
Abstract

Provided is an electric resistance welded steel pipe or tube having excellent fatigue durability after rapid and short-time heating quenching treatment. An electric resistance welded steel pipe or tube comprises: a base metal being a steel sheet having a specific chemical composition and an electric resistance weld portion having a bond width of 40×10m or more and 120×10m or less, wherein C-Cis 0.05 mass % or less, where C-Cis a difference between Cin mass % which is a minimum C content of the electric resistance weld portion and Cin mass % which is a C content of the steel sheet, and a depth of a total decarburized layer in each of an inner surface layer and an outer surface layer of the electric resistance welded steel pipe or tube is 50×10m or less.

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