| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing an oxide dispersion strengthened ferritic high chromium-iron alloy tube which has little anisotropy in high temperature strength between the longitudinal direction and the circumferential direction, and also has high high temperature strength. SOLUTION: A stock is produced by the mixing and sintering of metal powder and oxide powder, and is repeatedly subjected to cold rolling for three or more times and softening into a required tubular shape. At this time, the working degree of the cold rolling is controlled to >=30%, the softening heat treatment in the process of the rolling is performed at <1,100 deg.C, and the final annealing heat treatment is performed at >=1,100 deg.C. In this case, as a preferable composition, 11 to 15% Cr and, further, Ti, Mo, W, or the like, are contained, and the content of Y2 O3 as the oxide to be dispersed is 0.15 to 0.35%.
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