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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 9932651 B1

PDFFull Text
Date of Patent:
Apr. 03, 2018

Filed:

Jun. 29, 2012

Thick-walled high-strength seamless steel pipe with excellent sour resistance for pipe for pipeline, and process for producing same

Applicants:

Yasuhide Ishiguro, Aichi, JP;

Mitsuo Kimura, Chiba, JP;

Kenichiro Eguchi, Aichi, JP;

Hiroshi Yokogawa, Aichi, JP;

Tadao Katagiri, Tokyo, JP;

Masahito Tanaka, Beijing, CN;

Inventors:

Yasuhide Ishiguro, Aichi, JP;

Mitsuo Kimura, Chiba, JP;

Kenichiro Eguchi, Aichi, JP;

Hiroshi Yokogawa, Aichi, JP;

Tadao Katagiri, Tokyo, JP;

Masahito Tanaka, Beijing, CN;

Assignee:

JFE Steel Corporation, Tokyo, JP;

Attorney:

RatnerPrestia

Primary Examiner:

Veronica F Faison

Int. Cl.
CPC ...
C21D 8/08 (2006.01); C21D 9/08 (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); C22C 38/20 (2006.01); C22C 38/22 (2006.01); C22C 38/24 (2006.01); C22C 38/28 (2006.01); C22C 38/38 (2006.01); C22C 38/40 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01); C22C 38/58 (2006.01); F16L 9/02 (2006.01); C21D 1/25 (2006.01); C21D 1/63 (2006.01); C21D 8/10 (2006.01);
U.S. Cl.
CPC ...
C21D 9/085 (2013.01); C21D 1/25 (2013.01); C22C 38/001 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/14 (2013.01); C22C 38/20 (2013.01); C22C 38/22 (2013.01); C22C 38/24 (2013.01); C22C 38/28 (2013.01); C22C 38/38 (2013.01); C22C 38/40 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C22C 38/58 (2013.01); F16L 9/02 (2013.01); C21D 1/63 (2013.01); C21D 8/105 (2013.01); C21D 2261/00 (2013.01);
Abstract

A heavy wall and high strength seamless steel pipe having high sour resistance is provided. In particular, a quenching and tempering treatment is conducted to adjust the yield strength to be higher than 450 MPa and adjust the Vickers hardness HV5 that can be measured at an outermost side or an innermost side of the pipe under a 5 kgf load (test load: 49 N) to be 250 HV5 or less.

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