HEAT TRANSFER TUBE FOR WASTE HEAT BOILER UTILIZING WASTE INCINERATION EXHAUST GAS, EXCELLENT IN HIGH TEMPERATURE CORROSION RESISTANCE

摘要

PROBLEM TO BE SOLVED: To provide a heat transfer tube for a waste heat boiler utilizing waste incineration exhaust gas, excellent in high temp. corrosion resistance and particularly in high temp. intergranular corrosion resistance. ;SOLUTION: This heat transfer tube is composed of an Ni-base alloy which has a composition consisting of 23-27% Cr, 7-10% Mo, 0.5-5% Nb, 0.01-7% Fe, 0.001-0.05% C, 0.001-0.1% Mg, and the balance Ni with Si, P, and S, as inevitable impurities, limited to ≤0.1%, ≤0.03%, and ≤0.03%, respectively, and further containing, if necessary, 0.1-2% W and/or one or ≥2 kinds among 0.001-0.1% of rare earth elements, 0.001-0.1% Y, 0.001-0.1% Zr, and 0.001-0.5% Hf, and further containing, if necessary, either or both of 0.01-1.0% Mn and 0.001-0.1% Ca.;COPYRIGHT: (C)1997,JPO