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:
Oct. 10, 2017
Filed:
Feb. 27, 2013
Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;
Shinjiro Nakatsuka, Tokyo, JP;
Taro Ohe, Tokyo, JP;
Hisashi Amaya, Tokyo, JP;
Hideki Takabe, Tokyo, JP;
Yohei Otome, Tokyo, JP;
Yusaku Tomio, Tokyo, JP;
Masanao Seo, Tokyo, JP;
Tomohiko Omura, Tokyo, JP;
Kunio Kondo, Tokyo, JP;
NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;
Abstract
A stainless steel for oil wells which has excellent high-temperature corrosion resistance and can stably obtain a strength of not less than 758 MPa is provided. The stainless steel for oil wells contains, by masse, C: not more than 0.05%, Si: not more than 1.0%, Mn: 0.01 to 1.0%, P: not more than 0.05%, S: less than 0.002%, Cr: 16 to 18%, Mo: 1.8 to 3%, Cu: 1.0 to 3.5%, Ni: 3.0 to 5.5%, Co: 0.01 to 1.0%, Al: 0.001 to 0.1%, O: not more than 0.05%, and N: not more than 0.05%, the balance being Fe and impurities, and satisfies Formulas (1) and (2):Cr+4Ni+3Mo+2Cu≧44  (1)Cr+3Ni+4Mo+2Cu/3≦46  (2)