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:
Apr. 23, 2019
Filed:
Mar. 19, 2012
Tomohiko Omura, Osaka, JP;
Jun Nakamura, Osaka, JP;
Hirokazu Okada, Osaka, JP;
Hiroyuki Semba, Osaka, JP;
Yusaku Tomio, Osaka, JP;
Hiroyuki Hirata, Osaka, JP;
Masaaki Igarashi, Osaka, JP;
Kazuhiro Ogawa, Osaka, JP;
Masaaki Terunuma, Osaka, JP;
Tomohiko Omura, Osaka, JP;
Jun Nakamura, Osaka, JP;
Hirokazu Okada, Osaka, JP;
Hiroyuki Semba, Osaka, JP;
Yusaku Tomio, Osaka, JP;
Hiroyuki Hirata, Osaka, JP;
Masaaki Igarashi, Osaka, JP;
Kazuhiro Ogawa, Osaka, JP;
Masaaki Terunuma, Osaka, JP;
NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;
Abstract
There is provided an austenitic stainless steel for high-pressure hydrogen gas consisting, by mass percent, of C: 0.10% or less, Si: 1.0% or less, Mn: 3% or more to less than 7%, Cr: 15 to 30%, Ni: 10% or more to less than 17%, Al: 0.10% or less, N: 0.10 to 0.50%, and at least one kind of V: 0.01 to 1.0% and Nb: 0.01 to 0.50%, the balance being Fe and impurities, wherein in the impurities, the P content is 0.050% or less and the S content is 0.050% or less, the tensile strength is 800 MPa or higher, the grain size number (ASTM E112) is No. 8 or higher, and alloy carbo-nitrides having a maximum diameter of 50 to 1000 nm are contained in the number of 0.4/μmor larger in cross section observation.