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:
Feb. 15, 2011
Filed:
Jun. 19, 2007
Shunsuke Toyoda, Aichi, JP;
Masatoshi Aratani, Aichi, JP;
Yoshikazu Kawabata, Aichi, JP;
Yuji Hashimoto, Aichi, JP;
Koji Suzuki, Aichi, JP;
Kei Sakata, Aichi, JP;
Makio Gunji, Aichi, JP;
Akio Sato, Aichi, JP;
Tetsuro Sawaki, Aichi, JP;
Shunsuke Toyoda, Aichi, JP;
Masatoshi Aratani, Aichi, JP;
Yoshikazu Kawabata, Aichi, JP;
Yuji Hashimoto, Aichi, JP;
Koji Suzuki, Aichi, JP;
Kei Sakata, Aichi, JP;
Makio Gunji, Aichi, JP;
Akio Sato, Aichi, JP;
Tetsuro Sawaki, Aichi, JP;
JFE Steel Corporation, , JP;
Abstract
A high-tensile strength welded steel tube has excellent formability and torsional fatigue endurance after being formed into cross-sectional shape and then stress-relief annealed. A steel material used has a composition which contains C, Si, Al, 1.01% to 1.99% Mn, 0.041% to 0.150% Ti, 0.017% to 0.150% Nb, P, S, N, and O such that the sum of the content of Ti and that of Nb is 0.08% or more, the content of each of C, Si, and Al being within an appropriate range, the content of each of P, S, N, and O being adjusted to a predetermined value or less.