Welded stainless steel clad pipe and its manufacturing method

摘要

Provided is a seamless welded stainless steel clad steel pipe excellent in fracture characteristics of a welded portion and excellent in corrosion resistance on the inner surface of the pipe as it is welded without welding even when additional welding processes such as breeding after welding are performed. The present invention relates to a seamless welded stainless steel clad steel pipe comprising an outer layer of carbon steel or a low alloy steel and an inner layer of an austenitic stainless steel having a predetermined component composition and having a flat value h in a 90 ° flat test according to JIS G 3445 / D is less than 0.3, and the inner surface of the tube does not generate cracking in the sulfuric acid-copper sulfate corrosion test according to ASTM A262-13, Practice E. Here, h: flat crack height (mm), D: tube outer diameter (mm).