| 摘要 |
PURPOSE:To obtain a titled pipe which eliminates possibility of crack and exfoliation of an inside surface layer by binding metallurgically and integrally the inside layer consisting of a hardened high alloy steel to a pipe body consisting of an ordinary carbon steel or the like which is not hardened. CONSTITUTION:An inside layer 2 consisting of a high alloy steel which is more easily hardenable than a pipe body 1 consisting of an ordinary carbon steel or low alloy steel is formed on the inside surface of said body 1 by a joining method involving metallurgical joining such as welding, explosive cladding or diffusion joining method. The pipe is then subjected to a hardening treatment under such conditions under which only the inside layer 2 is hardened. The pipe having the inside layer 2 which is highly resistant to corrosion and wear, obviated shifting from the body 1 and contains internally compressive stress is thus obtd. |
