Austenitic Stainless Alloy Material

Abstract: The present invention provides an austenitic stainless alloy material which has excellent creep strength and excellent stress relaxation cracking resistance. An austenitic stainless alloy material according to the present disclosure contains, in mass%, 0.03% to 0.12% of C, 0.05% to 2.00% of Si, 0.05% to 3.00% of Mn, 0.03% or less of P, 0.010% or less of S, not less than 18.0% but less than 25.0% of Ni, not less than 22.0% but less than 30.0% of Cr, 0.04% to 0.80% of Co, 0.002% to 0.010% of Ti, 0.1% to 1.0% of Nb, 0.01% to 1.00% of V, not less than 0.001% but less than 0.030% of Al and 0.10% to 0.35% of N, while having a number density of precipitates having a circle-equivalent diameter of 0.5 µm to 2.0 µm of 5,000 per mm2 or more.

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