LAMINATED TUBE FOR HEAT TRANSFER FOR WASTE HEAT BOILER UTILIZING WASTE INCINERATION EXHAUST GAS, EXCELLENT IN INTERGRANULAR CORROSION RESISTANCE

摘要

PROBLEM TO BE SOLVED: To provide a laminated tube for heat transfer 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 tube is constituted of an austenitic stainless steel which has a composition consisting of, by weight, 25-43% Ni, 20-32% Cr, 0.1-5% of either or both of Nb and Ta, 0.001-0.1% Mg, 0.001-0.1% B, 0.001-0.05% C, ≤0.1% Si, ≤0.03% P, ≤0.03% S, and the balance Fe with inevitable impurities and further containing, if necessary, the following (a) and/or (b) and/or (c): (a) is 0.1-5% W; (b) is 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; (c) is either or both of 0.01-1.0% Mn and 0.001-0.1% Ca.;COPYRIGHT: (C)1997,JPO