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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 12698543 B1

PDFFull Text
Date of Patent:
Aug. 04, 2026

Filed:

Mar. 24, 2022

Hot-stretch-reduced electric resistance welded pipe

Applicant:

Nippon Steel Corporation, Tokyo, JP;

Inventors:

Kenzo Tashima, Tokyo, JP;

Kensuke Nagai, Tokyo, JP;

Tatsuo Yokoi, Tokyo, JP;

Mitsuhiro Hamaishi, Tokyo, JP;

Takashi Tsusue, Tokyo, JP;

Assignee:

NIPPON STEEL CORPORATION, Tokyo, JP;

Attorney:

Greer, Burns & Crain, Ltd.

Primary Examiner:

Xiaowei Su

Int. Cl.
CPC ...
C21D 9/08 (2006.01); B21C 37/08 (2006.01); C21D 8/10 (2006.01); C21D 9/50 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/14 (2006.01);
U.S. Cl.
CPC ...
C21D 9/08 (2013.01); B21C 37/08 (2013.01); C21D 8/10 (2013.01); C21D 9/50 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/14 (2013.01); C21D 2201/00 (2013.01); C21D 2211/002 (2013.01); C21D 2211/005 (2013.01); C21D 2211/008 (2013.01); C21D 2211/009 (2013.01);
Abstract

A hot-stretch-reduced electric resistance welded pipe has a base metal portion and a weld portion, the base metal portion has a predetermined chemical composition, a Ti/N value obtained by dividing Ti content by N content is 3.0 or more, in a microstructure of the weld portion, the average grain diameter is 10.0 μm or less, the area ratio of ferrite is 20% or more, and the remaining structure includes at least one or more of pearlite and bainite/martensite, and in a texture of the weld portion, the accumulation intensity of a {001} plane is 6.0 or less, and a critical cooling rate Vc90 of the base metal portion is 5° C./s to 90° C./s.

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