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:
Dec. 15, 2015
Filed:
Jun. 20, 2012
Hiroyuki Hirata, Neyagawa, JP;
Tomohiko Omura, Kishiwada, JP;
Yusaku Tomio, Nishinomiya, JP;
Jun Nakamura, Nishinomiya, JP;
Hiroyuki Hirata, Neyagawa, JP;
Tomohiko Omura, Kishiwada, JP;
Yusaku Tomio, Nishinomiya, JP;
Jun Nakamura, Nishinomiya, JP;
NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;
Abstract
An austenitic steel welded joint is produced by gas tungsten arc welding an austenitic steel base metal with a welding material of austenitic steel having a composition comprising: C≦0.1%; Si≦0.8%; Mn: 1.5 to 5.5%; Ni: 8 to 15%; Cr: 18 to 24%; Al<0.05%; N: 0.15 to 0.35%; and one or more of V≦0.5%, Nb≦0.5%, and Mo≦4.5% if necessary, the balance being Fe and impurities that contain O≦0.02%, P≦0.05%, and S≦0.03%. The chemical composition satisfies [413−462(C+N)−9.2Si−8.1Mn−13.7Cr−9.5Ni−18.5Mo≦−70]. The amount of ferrite of the weld metal is 20% or less in area ratio. The welded joint has high strength and excellent hydrogen embrittlement resistance and is useful in high-pressure hydrogen gas piping where no postweld heat treatment is performed.