METHOD FOR MANUFACTURING METAL PIPE

摘要

Provided is a method for producing a metal tube which has excellent carburization resistance and coking resistance in a carburizing gas atmosphere.  The inner surface of a metal tube containing 20 to 55% by mass of Cr and 20 to 70% by mass of Ni is subjected to a mechanical treatment, followed by a thermal treatment in a temperature range from 1050 to 1270ºC for 0.5 to 60 minutes, whereby an oxide scale layer containing mainly Cr is formed at least on the inner surface of the metal tube.