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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 9651175 B1

PDFFull Text
Date of Patent:
May. 16, 2017

Filed:

Jun. 13, 2014

Seamless steel pipe for line pipe

Applicant:

Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;

Inventors:

Yuji Arai, Tokyo, JP;

Yukimasa Ueda, Tokyo, JP;

Kei Murata, Tokyo, JP;

Yasuyoshi Hidaka, Tokyo, JP;

Assignee:

NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;

Attorney:

Clark & Brody

Primary Examiner:

Michael E La Villa

Int. Cl.
CPC ...
F16L 9/02 (2006.01); C22C 38/58 (2006.01); C22C 38/50 (2006.01); C22C 38/48 (2006.01); C22C 38/46 (2006.01); C22C 38/44 (2006.01); C22C 38/42 (2006.01); C22C 38/06 (2006.01); C22C 38/04 (2006.01); C22C 38/02 (2006.01); C22C 38/00 (2006.01); C21D 8/10 (2006.01); C21D 6/00 (2006.01); C21D 1/613 (2006.01); C21D 9/08 (2006.01); C22C 38/40 (2006.01); B21B 3/00 (2006.01);
U.S. Cl.
CPC ...
F16L 9/02 (2013.01); C21D 1/613 (2013.01); C21D 6/004 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/10 (2013.01); C21D 8/105 (2013.01); C21D 9/08 (2013.01); C21D 9/085 (2013.01); C22C 38/00 (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 38/40 (2013.01); C22C 38/42 (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); B21B 3/00 (2013.01); C21D 2211/002 (2013.01); Y10T 428/1259 (2015.01); Y10T 428/1266 (2015.01); Y10T 428/12583 (2015.01); Y10T 428/12611 (2015.01); Y10T 428/12618 (2015.01); Y10T 428/12882 (2015.01); Y10T 428/12903 (2015.01); Y10T 428/12917 (2015.01); Y10T 428/12924 (2015.01); Y10T 428/12937 (2015.01); Y10T 428/12944 (2015.01); Y10T 428/12993 (2015.01); Y10T 428/24942 (2015.01); Y10T 428/24983 (2015.01); Y10T 428/26 (2015.01);
Abstract

There is provided a seamless steel pipe for line pipe, wherein a chemical composition consists, by mass percent, of C: 0.03-0.10%, Si: ≦0.50%, Mn: 1.0-2.0%, P: ≦0.050%, S: ≦0.005%, Cr: 0.05-1.0%, Mo: 0.01-0.30%, Al: 0.001-0.10%, N: ≦0.01%, Ni: 0.04-2.0%, Ca: 0.0005-0.0050%, Cu: 0-2.0%, Ti: 0-0.05%, Nb: 0-0.05%, V: 0-0.10%, the balance: Fe and impurities, and satisfies the conditions of Cu+Ni: ≧0.10%, and Mo+V: ≦0.30%, wherein in a scale formed on the surface of the steel pipe, metal particles consisting mainly of Ni or Cu having an average circle-equivalent diameter of 0.1-5 μm exist, and a distance from a boundary between the base metal of the steel pipe and the scale to a region in which the metal particles do not exist is 20 μm or longer.

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