To provide a manufacturing method of an electric resistance welded tube excellent in buckling resistance property which hardly causes buckling due to earthquake or frozen soil after being laid as a line pipe.
In the manufacturing method of the electric resistance welded tube, a plate material is roll-formed while it is being passed, both abutted ends of a plate width 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 and an angle between the axial direction of the roll of the rotary straightening machine and the material passing direction 20 of the tube is made to be not less than 3 degrees but not more than 45 degrees.
KENMOCHI KAZUHITO
SAKATA TAKASHI
INOUE TOSHIHIRO
KUMAZAWA SHINTARO
| JP2006231401A | 2006-09-07 |
| WO2007119817A1 | 2007-10-25 |