HIGH CORROSION RESISTANCE STEEL AND CHIMNEY FOR COAL FIRED POWER PLANT

摘要

PROBLEM TO BE SOLVED: To provide a steel excellent in general corrosion resistance in an acidic environment due to acid dew point in a coal combustion type plant and corrosion resistance in a Cl ion environment of high concn. in which Cl ions are condensed and concentrated into the water of dew condensation. ;SOLUTION: This steel has a compsn. contg., by weight, ≤0.02% C, 21 to 27% Cr, 18 to 27% Ni, 0.01 to 0.3% N and 0.1 to 2.0% Cu, contg. one or two kinds of Mo and Wo in the range of Mo+1/2×W: 3 to 5% for pitting corrosion resistance and crevice corrosion resistance, also satisfys Ni-0.6Cr+1.5(Mo+1/2×W)+7.5Cu+122N≥35 to improve its general corrosion resistance, and also consists of balance Fe with inevitable impurities.;COPYRIGHT: (C)2000,JPO