Austenitic stainless steel pipe excellent in steam oxidation resistance and manufacturing method therefor

A manufacturing method for an austenitic stainless steel pipe excellent in steam oxidation resistance containing, by mass percent, 14 to 28% of Cr and 6 to 30% of Ni,

• wherein a region satisfying Formula (1) is formed in a metal structure at a depth of 5 to 20 μm from the inner surface of the steel pipe, the method being carried out by blasting particles onto the inner surface of the austenitic stainless steel pipe:
• g≧0.3 (1)
• where g in Formula (1) is a value calculated from Formula (2),
• g=(α/β)×δ/ε×100 (2)
• where the meanings of symbols in Formula (2) are as follows:
• g:
• volume ratio (%)
• α:
• sum total of the number of pixels of digital image in region in which orientation difference of adjacent crystals detected by electron backscattering pattern is 5 to 50 degrees
• β:
• the number of total pixels of digital image in region of measurement using electron backscattering pattern
• ε:
• analysis pitch width of electron backscattering pattern (μm)
• δ:
• grain boundary width (μm).