| 摘要 |
<p>Provided is an austenitic heat-resistant cast steel characterized by being composed, by, mass, of 0.3% to 0.6% carbon; 1.1% to 2% silicon; less than 1.5% manganese; 17.5% to 22.5% chromium; 8% to 13% nickel; at least one of tungsten and molybdenum such that W + 2Mo is between 1.5% and 4%; 1% to 4% niobium; 0.01% to 0.3% nitrogen; and 0.01% to 0.5% sulfur, with the remainder consisting of iron and unavoidable impurities. The austenitic heat-resistant cast steel is furthermore characterized by fulfilling equations (1), (2), (3), and (4) below. 0.05 = (C - Nb / 8) = 0.6... (1) 17.5 = 17.5Si - (W + 2Mo)... (2) 5.6Si + (W + 2Mo) = 13.7... (3) 0.08Si + (C - Nb / 8) + 0.015Cr + 0.011Ni + 0.03W + 0.02Mo = 0.96... (4) Each chemical symbol in formulas (1) through (4) indicates the content (mass percentage) of that element in the steel.</p> |
