| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method of an electric resistance welded tube excellent in buckling resistance property. 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 10, heat treatment is applied to an electric resistance welded area, and then the tube is straightened. When straightening the tube, a rotary straightening machine 8 is used wherein a concave roll having an effective barrel length not less than a tube outer diameter is used as the roll of the rotary straightening machine. COPYRIGHT: (C)2010,JPO&INPIT
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