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:
Jan. 04, 2011
Filed:
Oct. 22, 2004
Mitsuo Kimura, Chiyoda-ku, JP;
Takanori Tamari, Chiyoda-ku, JP;
Yoshio Yamazaki, Chiyoda-ku, JP;
Ryosuke Mochizuki, Chiyoda-ku, JP;
Mitsuo Kimura, Chiyoda-ku, JP;
Takanori Tamari, Chiyoda-ku, JP;
Yoshio Yamazaki, Chiyoda-ku, JP;
Ryosuke Mochizuki, Chiyoda-ku, JP;
JFE Steel Corporation, , JP;
Abstract
A highly corrosion resistant high strength stainless steel pipe for linepipe, having a composition containing about 0.001 to about 0.015% C, about 0.01 to about 0.5% Si, about 0.1 to about 1.8% Mn, about 0.03% or less P, about 0.005% or less S, about 15 to about 18% Cr, about 0.5% or more and less than about 5.5% Ni, about 0.5 to about 3.5% Mo, about 0.02 to about 0.2% V, about 0.001 to about 0.015% N, and about 0.006% or less O, by mass, so as to satisfy (Cr+0.65 Ni +0.6Mo+0.55Cu−20C≧18.5), (Cr+Mo+0.3Si−43.5C−0.4Mn−Ni−0.3Cu−9 N≧11.5) and (C+N≦0.025). Preferably quenching and tempering treatment is applied to the pipe. The composition may further contain about 0.002 to about 0.05% Al, and may further contain one or more of Nb, Ti, Zr, B, and W, and/or Cu and Ca. The microstructure preferably contains martensite, ferrite, and residual γ.