Alloy Material

Abstract: The present invention provides an alloy material having excellent resistance to grain boundary corrosion. An alloy material according to the present disclosure has a chemical composition comprising, in terms of mass%, 0.005-0.020% C, 0.05-0.50% Si, 0.05-1.00% Mn, not more than 0.030% P, not more than 0.0100% S, 1.5-3.0% Cu, 35.0-50.0% Ni, 20.0-30.0% Cr, 2.5-4.0% Mo, 0.01-0.80% Co, 0.01-0.30% W, not more than 0.0050% Ca, 0.001-0.015% N, not more than 0.20% Al, not more than 0.0030% B, not more than 0.050% Sn, and 0.40-0.90% Ti, with the remainder being composed of Fe and impurities, wherein the total content of Ti, Nb, V, Zr, Hf, and Ta is 0.420-1.000%, and the number density of a fine nitrogen-containing precipitate at the grain boundary of the alloy material is not more than 20/µm.

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