IDiyas

For the Inventor, By the Inventor

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 10407758 B1

PDFFull Text
Date of Patent:
Sep. 10, 2019

Filed:

Jun. 17, 2013

Steel for oil country tubular goods and method of producing the same

Applicant:

Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;

Inventors:

Tomohiko Omura, Tokyo, JP;

Yuji Arai, Tokyo, JP;

Kaori Kawano, Tokyo, JP;

Akihiro Sakamoto, Tokyo, JP;

Kazuo Okamura, Tokyo, JP;

Kenji Yamamoto, Tokyo, JP;

Keiichi Kondo, Tokyo, JP;

Koji Nagahashi, Tokyo, JP;

Masanao Seo, Tokyo, JP;

Assignee:

NIPPON STEEL CORPORATION, Tokyo, JP;

Attorney:

Clark & Brody

Primary Examiner:

Colleen P Dunn

Assistant Examiner:

Nicholas A Wang

Int. Cl.
CPC ...
C22C 38/32 (2006.01); C21D 8/10 (2006.01); C21D 9/08 (2006.01); C22C 38/00 (2006.01); C22C 38/12 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/14 (2006.01); C22C 38/22 (2006.01); C22C 38/24 (2006.01); C22C 38/26 (2006.01); C22C 38/28 (2006.01); C21D 1/20 (2006.01); C21D 1/25 (2006.01); C21D 1/18 (2006.01); C21D 6/00 (2006.01); C21D 8/00 (2006.01);
U.S. Cl.
CPC ...
C22C 38/32 (2013.01); C21D 1/18 (2013.01); C21D 1/20 (2013.01); C21D 1/25 (2013.01); C21D 6/002 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/005 (2013.01); C21D 8/10 (2013.01); C21D 9/08 (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 38/12 (2013.01); C22C 38/14 (2013.01); C22C 38/22 (2013.01); C22C 38/24 (2013.01); C22C 38/26 (2013.01); C22C 38/28 (2013.01); C21D 2211/002 (2013.01); C21D 2211/005 (2013.01); C21D 2211/008 (2013.01);
Abstract

A steel for oil country tubular goods includes, as a chemical composition, by mass %, C, Si, Mn, Al, Mo, P, S, O, N, and a balance containing Fe and impurities, wherein a full width at half maximum HW of a crystal plane corresponding to a () crystal plane of an α phase and a carbon content expressed in mass % in the chemical composition satisfy HW×C≤0.38, the carbon content and a molybdenum content expressed in mass % in the chemical composition satisfy C×Mo≥0.6, a number of MC carbides having a hexagonal crystal structure and having an equivalent circle diameter of 1 nm or more is 5 pieces or more per one square micron, and an yield strength is 758 MPa or more.

Find Patent Forward Citations

Loading…