Austenitic alloy tube
An austenitic alloy tube subjected to a cold working and an annealing heat treatment contains C: 0.01% to 0.15%, Cr: 10.0% to 40.0%, Ni: 8.0% to 80.0%, in mass %, and has a metallographic structure satisfying the following Expressions (i) to (iii). R≦f 1 (i) R=I 220 /I 111 (ii) f 1=0.28×( F 111 8.0 /( F 111 8.0 +0.35 8.0 )) (iii) Where, in the above Expressions, R is a ratio of an integrated intensity of {220} to an integrated intensity of {111} on a surface layer which is measured by a grazing incidence X-ray diffraction method, I 220 is the integrated intensity of {220}, I 111 is the integrated intensity of {111}, and F 111 is full width of half maximum of {111} on the surface layer which is measured by the grazing incidence X-ray diffraction method.
1. An austenitic alloy tube subjected to a cold working and an annealing heat treatment, comprising:
C: 0.01% to 0.15%;
Cr: 10.0% to 40.0%; and
Ni: 45% to 80.0%, in mass %,
wherein the austenitic alloy tube has a metallographic structure satisfying the following Expressions (i) to (iii),
R≦f 1 (i)
R=I 220 /I 111 (ii)
f 1=0.28×( F 111 8.0 /( F 111 8.0 +0.35 8.0 )) (iii)
where, in the above Expressions, R is a ratio of an integrated intensity of {220} to an integrated intensity of {111} on a surface layer which is measured by a grazing incidence X-ray diffraction method, I 220 is the integrated intensity of {220}, I 111 is the integrated intensity of {111}, and F 111 is full width of half maximum of {111} on the surface layer which is measured by the grazing incidence X-ray diffraction method.
2. The austenitic alloy tube according to claim 1 ,
wherein the austenitic alloy tube is used as a nuclear power plant material.