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:
Aug. 08, 2017
Filed:
Sep. 27, 2013
Applicant:
Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;
Inventors:
Assignee:
Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C22C 38/04 (2006.01); C22C 38/14 (2006.01); C22C 38/12 (2006.01); C22C 38/02 (2006.01); C21D 8/10 (2006.01); C21D 9/14 (2006.01); F16L 9/02 (2006.01); C22C 38/00 (2006.01); C22C 38/06 (2006.01); C22C 38/08 (2006.01); C22C 38/16 (2006.01); C22C 38/18 (2006.01); B23K 35/38 (2006.01); B23K 11/087 (2006.01); C21D 9/50 (2006.01); B23K 11/00 (2006.01); C22C 38/26 (2006.01); C22C 38/28 (2006.01); C21D 9/46 (2006.01);
U.S. Cl.
CPC ...
F16L 9/02 (2013.01); B23K 11/002 (2013.01); B23K 11/0873 (2013.01); B23K 35/38 (2013.01); C21D 9/50 (2013.01); C22C 38/00 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/005 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/08 (2013.01); C22C 38/12 (2013.01); C22C 38/14 (2013.01); C22C 38/16 (2013.01); C22C 38/18 (2013.01); C22C 38/26 (2013.01); C22C 38/28 (2013.01); C21D 9/46 (2013.01); C21D 2211/005 (2013.01); C21D 2211/008 (2013.01); Y10T 428/12292 (2015.01);
Abstract
An electric resistance welded steel pipe which has sufficient strength and low-temperature toughness and a low yield ratio and which is suitable as a line pipe to be laid in depths of the sea, characterized in that: the composition of the base material contains, in mass %, 0.05 to 0.10% of C, 1.00 to 1.60% of Mn, and 0.005 to less than 0.035% of Nb, and has a Ceq value of 0.23 to 0.38; and the metal microstructure of the base material contains 3 to 13% of martensite in area fraction with the balance being ferrite.