Disclosed is a Ni-based heat-resistant
alloy that contains C <= 0.1%, Si <= 1%, Mn <= 1%, Cr more than 15% and less than 28%, Fe <= 15%, W more than 5% to 20%, Al more than 0.5% to 2%, Ti more than 0.5% to 2%, Nd 0.001% to 0.1%, B 0.0005% to 0.01%, and the remainder comprising Ni and impurities, wherein the impurities P, S, Sn, Pb, Sb, Zn and As are such that P <= 0.03%, S <= 0.01%, Sn <= 0.020%,Pb <= 0.010%, Sb <= 0.005%, Zn <= 0.005%, and As <= 0.005%, and in addition, satisfy the three equations [0.015 <= Nd + 13.4*B <= 0.13], [Sn + Pb <= 0.025] and [Sb + Zn + As <= 0.010]. With the
alloy, an even higher level of strength than with conventional Ni-based heat-resistant alloys can be achieved, while the
ductility and
toughness after long-term use at high temperature are significantly improved, and the zero
ductility temperature and hot
processing characteristics are even further improved. Thus, the
alloy can be favorably used as a
pipe material, a thick sheet for heat-resistant and compression-resistant members, a rod material, and cast articles such as in power generating boilers or industrial chemical plants. The alloy could also contain a specified quantity of at least one ofMo, Co, Nb, V, Zr, Hf, Mg, Ca, Y, La, Ce, Ta or Re.