AUSTENITIC ALLOY TUBE

摘要

An austenitic alloy tube is one that has undergone a cold working treatment and an annealing/heating treatment, and has a metallic structure that contains, in mass%, 0.01 to 0.15% of C, 10.0 to 40.0% of Cr and 8.0 to 80.0% of Ni and fulfills formulae (i) to (iii). R = f1 (i) R = I220/I111 (ii) f1 = 0.28×(F111 8.0/(F111 8.0+0.358.0)) (iii) In the formulae, R represents the ratio of the integrated intensity of {220} on a surface layer to the integrated intensity of {111} on the surface layer wherein the integrated intensities are obtained by a grazing incidence X-ray diffraction method; I220 represents the above-mentioned integrated intensity of the {220}; I111 represents the above-mentioned integrated intensity of the {111}; and F111 represents the half width value of a diffraction peak for the {111} on the surface layer which is obtained by the grazing incidence X-ray diffraction method.