Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Yoshikazu Kawabata0
Motoaki Itadani0
Takaaki Toyooka0
Takatoshi Okabe0
Akira Yorifuji0
Masanori Nishimori0
Masatoshi Aratani0
Date of Patent
September 22, 2009
0Patent Application Number
102589820
Date Filed
June 14, 2001
0Patent Primary Examiner
Patent 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 Ac3 with a reduction in diameter of not less than 30%, preferably after heating the steel pipe to temperatures of not lower than Ac1, the 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.
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