METHOD FOR PRODUCING STEEL PIPE PLATED WITH METAL BY THERMAL SPRAYING

摘要

[PROBLEMS] To provide a method for producing a steel pipe plated with a metal by thermal spraying, which has a metal layer being good and nearly homogeneous over the whole surface thereof, with good productivity. [MEANS FOR SOLVING PROBLEMS] A method for producing a metal pipe wherein a metal plate having a first chemical composition is continuously formed into a pipe and butt ends are continuously welded, to thereby form a metal pipe, which comprises forming a metal layer exhibiting no discontinuity in the circumference direction and in the length direction and having a second chemical composition different from the above first chemical composition by thermal spraying, directly on the surface of the metal pipe after the above continuous welding. It is preferred that the method further comprises, after the formation of a thermal-sprayed metal layer on the outer surface of the pipe, a working step for improving the uniformity of the thickness of said metal layer.