| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem of not sufficiently improving buckling resistance property of an electric resistance welded tube by conventional technology. SOLUTION: In the manufacturing method of the electric resistance welded tube, a steel strip is roll formed while it is being passed, both abutted ends of the strip in a width direction are electric-resistance-welded to form a tube, heat treatment is applied to an electric resistance welded area, and then the tube is straightened by a rotary straightening machine. The rotary straightening machine is not a general one but one 1 having a plurality of stands and allowing the distance between these stands to be variable. COPYRIGHT: (C)2010,JPO&INPIT
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