COATED STEEL TUBE MANUFACTURING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a coated steel tube having the excellent corrosion-resistant capacity by reducing the amount of residual air in a space formed between the outer surface of the steel tube and the inner surface of a coating material.

SOLUTION: When at least a part of an outer surface of a steel tube 2 is covered with a plurality of coating materials 3-7 over the entire circumference, a plurality of belts 60 are wound around outer surfaces of the wound coating materials 3-7 in a circumferential direction and bound every time one of the coating materials 3-7 is wound around the outer surface of the steel tube 2 in a circumferential direction, the wound coating materials 3-7 are fastened and fixed to the outer surface of the steel tube 2, and after the coating materials 3-7 are tightly attached to the outer surface of the steel tube 2, the primary temporary welding is performed.

COPYRIGHT: (C)2007,JPO&INPIT