Multi-wound stainless steel pipe

摘要

A multi-wound stainless steel pipe produced by plastic-deforming a hoop material made of a stainless steel sheet applied with a Cu-brazing material on the surface thereof to a multi-wound pipe and after melting the brazing material between the walls of the multi-wound pipe, cooling the molten brazing material, wherein the Cu-brazing material between the walls and the Cu-brazing material at the surfaces of the inside surface and the outside surface of the pipe are diffused into the base material at a depth of from 0.5 mu m to 15 mu m and bonded thereto. The multi-wound stainless steel pipe is excellent in the pressure resisting strength and working strength and has a high quality.