AUSTENITIC STAINLESS STEEL PIPE, BOILER DEVICE, AND METHOD FOR PROCESSING INNER SURFACE OF PIPE

摘要

With the present invention the inner surface (5) of an austenitic stainless steel pipe (1) is subjected to shot processing by means of shot particles (3), and the quality of the water vapor oxidation resistance of the pipe inner surface (5) is determined on the basis of the degree of hardness at a predetermined depth from the post-processing outermost surface of the steel pipe (1) which has been subjected to shot processing. In the aforementioned determination, when the roughness of the pipe inner surface (5) after the pipe inner surface (5) has been subjected to shot processing has an arithmetic mean roughness (Ra) of 2 µm or less, or when the hardness at the predetermined depth is 300 Hv or greater, it is determined that the pipe inner surface has excellent water vapor oxidation resistance. Thus, an austenitic stainless steel pipe for which the arithmetic mean roughness (Ra) of the pipe inner surface (5) is 2 µm or less or for which the hardness at the predetermined depth is 300 Hv or greater can be used as a heat transfer pipe for a boiler.