Abstract
Corrosion test was conducted at a municipal refuse incinerator using four kinds of super heater tube materials including the materials developed by us for high-efficieny electric generation at the temperature of 400 to 450℃ for two years. The results showed that two kinds of QSX materials developed were equal to or more corrosion resisting than the present materials for superheated steam of high temperature. The guideline of boiler design concerning exhaust gas and steam temperature was indicated using stainless steal of SUS310 class to depress the maximum thickness loss of 0.6mm/year. The QSX-alloy indicated uniform metal wastage after slight pitting while SUS310 and HR11 indicated local corrosion form of pitting and intergranular corrosion. Corrosion mechanism is considered to be the complex corrosion of gasification corrosion and melt salt corrosion which is effected by adhered ash components and exhaust gas temperature.
