CR-CONTAINING AUSTENITE ALLOY PIPE AND PRODUCTION METHOD FOR SAME

摘要

There is provided a Cr-containing austenitic alloy tube, wherein a chromium oxide film with a thickness of 0.05 to 1.5 µm having the relationship defined by Formula (i) is formed on the inner surface of the tube, wherein the average concentration of C in the depth range of 5 to 10 µm from the inner surface is lower than the concentration of C in a base metal; 0.4 ‰¤ ´ �¢ 1 / ´ �¢ 2 ‰¤ 2.5
wherein ´1 and ´2 are thicknesses (µm) of the chromium oxide film at both ends of tube, respectively.