COMPOSITE METALLIC PIPE FOR CARBURIZING TREATMENT HAVING EXCELLENT CARBURIZING RESISTANCE AND EXCELLENT HIGH TEMPERATURE STRENGTH

摘要

PROBLEM TO BE SOLVED: To provide a composite metallic pipe for a carburizing treatment, which composite metallic pipe is excellent in both of carburizing resistance and high temperature strength, and also can be used as a small diameter pipe and a long pipe.;SOLUTION: The composite metallic pipe 10 for the carburizing treatment is configured by laminatedly forming a first building-up welding layer 14 on the outer surface of a base pipe 12, the first building-up welding layer 14 being made of an alloy, which has chemical composition different from that of the base pipe 12 and has the high carburizing resistance, and also by laminatedly forming a second building-up welding layer 16 on the outer surface of the first building-up welding layer 14, the second building-up welding layer 16 being made of an alloy, which has chemical composition different from those of the base pipe 12 and the first building-up welding layer 14 and has high temperature strength.;COPYRIGHT: (C)2007,JPO&INPIT