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:
Mar. 02, 2010
Filed:
Jan. 07, 2008
Applicants:
Kenji Kobayashi, Osaka, JP;
Tomohiko Omura, Osaka, JP;
Inventors:
Kenji Kobayashi, Osaka, JP;
Tomohiko Omura, Osaka, JP;
Assignee:
Sumitomo Metal Industries, Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C22C 38/00 (2006.01); C22C 38/60 (2006.01); C22C 38/22 (2006.01);
U.S. Cl.
CPC ...
Abstract
Low alloy steel for oil country tubular goods contains, in percentage by mass, 0.20% to 0.35% C, 0.05% to 0.5% Si, 0.05% to 0.6% Mn, at most 0.025% P, at most 0.01% S, 0.005% to 0.100% Al, 0.8% to 3.0% Mo, 0.05% to 0.25% V, 0.0001% to 0.005% B, at most 0.01% N, and at most 0.01% O, the balance comprising Fe and impurities, the steel satisfying Expression (1): 12V+1−Mo≧0 (1) where the symbols of elements represent the contents of the elements in percentage by mass. In this way, the steel according to the present invention has high SSC resistance.