Abstract: A precipitation-strengthened Ni-based heat-resistant alloy of the present invention includes 0.03 wt % or less of C, 0.5 wt % or less of Mn, 0.01 wt % or less of P, 0.01 wt % or less of S, 2.0 to 3.0 wt % of Si, 23 to 30 wt % of Cr, 7.0 to 14.0 wt % of W, 10 to 20 wt % of Fe, and 40 to 60 wt % of Ni, wherein a total content of C, N, O, P and S is 0.01 wt % or less. A silicide is dispersed and precipitated and a grain size of a matrix austenite is controlled through a thermo-mechanical treatment. As a result, the precipitation-strengthened Ni-based heat-resistant alloy excellent in irradiation resistance, heat resistance and corrosion resistance can be obtained with a low cost.

Abstract: A precipitation-strengthened Ni-based heat-resistant alloy of the present invention includes 0.03 wt % or less of C, 0.5 wt % or less of Mn, 0.01 wt % or less of P, 0.01 wt % or less of S, 2.0 to 3.0 wt % of Si, 23 to 30 wt % of Cr, 7.0 to 14.0 wt % of W, 10 to 20 wt % of Fe, and 40 to 60 wt % of Ni, wherein a total content of C, N, O, P and S is 0.01 wt % or less. A silicide is dispersed and precipitated and a grain size of a matrix austenite is controlled through a thermo-mechanical treatment. As a result, the precipitation-strengthened Ni-based heat-resistant alloy excellent in irradiation resistance, heat resistance and corrosion resistance can be obtained with a low cost.