| 摘要 |
PROBLEM TO BE SOLVED: To provide a butt-welded pipe having good workability, specifically a butt-welded pipe having good workability which does not cause cracks at a joining part when subjected to strong working such as flaring. SOLUTION: The ratio of a length 11 in the thickness direction of the joining part to a pipe thickness 12 in the butt-welded pipe 8 is made to be 1.00 or more. The ratio of a maximum thickness 14 of a bead part to the pipe thickness 12 is 1.010 or more. Butt welding is carried out by allowing an upset ratio during butt welding to be 1.0% or more. COPYRIGHT: (C)2010,JPO&INPIT
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