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:
Sep. 22, 2009
Filed:
Jun. 14, 2001
Takaaki Toyooka, Handa, JP;
Yoshikazu Kawabata, Handa, JP;
Akira Yorifuji, Handa, JP;
Masanori Nishimori, Handa, JP;
Motoaki Itadani, Handa, JP;
Takatoshi Okabe, Handa, JP;
Masatoshi Aratani, Handa, JP;
Takaaki Toyooka, Handa, JP;
Yoshikazu Kawabata, Handa, JP;
Akira Yorifuji, Handa, JP;
Masanori Nishimori, Handa, JP;
Motoaki Itadani, Handa, JP;
Takatoshi Okabe, Handa, JP;
Masatoshi Aratani, Handa, JP;
JFE Steel Corporation, , JP;
Abstract
A steel pipe is produced by a method including performing diameter-reducing rolling on a steel pipe in a temperature range of from 600° C. to Acwith a reduction in diameter of not less than 30%, preferably after heating the steel pipe to temperatures of not lower than Acthe steel pipe being produced by seam-welding strip steel, or a method further including the step of performing heat treatment of holding the rolled steel pipe in a temperature range of from 600° C. to 900° C. for a time of 1 second or longer during cooling subsequent to the diameter-reducing rolling or by reheating the rolled steel pipe after the cooling.