| 摘要 |
PURPOSE:To obtain easily a cylinder having an inside layer which is highly resistant to heat, corrosion and wear and has substantial joint strength by binding metallurgically and integrally the inside layer consisting of a hardened high alloy steel to a cylinder 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 cylinder body 1 consisting of an ordinary carbon steel or low alloy steel is formed on the inside wall surface of said body 1 by a joining method involving metallurgical bonding such as welding, explosive cladding or diffusion joining to be executed under the gaseous pressure of a high temp. and high pressure or the like. Such materials with which the body 1 is not hardened and only the layer 2 is hardened when the body 1 and the layer 2 are heat-treated under the same heat treating conditions are used for the respective materials constituting said body and inside layer. If the hardening treatment is performed under such conditions, the cylinder of which the body 1 is not hardened and only the layer 2 is hardened and which has the inside layer 2 contg. internally compressive stress is obtd. |
