Effect of molten salts on the creep resistance of 304 Type stainless steel
DOI:
https://doi.org/10.3989/revmetalm.1995.v31.i3.963Keywords:
Hot corrosion, Molten salts, Creep, Superheater, Reheater, Residual lifeAbstract
Problems caused by both hot corrosion and creep type-damage occurring on superheater and reheater tubes of power plants using heavy oil as fuel shorten their design lives. The acceleration of hot corrosion attack of boilers is caused by the presence of fuel ash deposits containing mainly vanadium, sodium and sulphur, in the form of Na2SO4 y V2O5 and V2O5 which form low melting point compounds. In addition to this, the tubes are exposed to the action of both high stresses and high temperatures, producing the so called creep damage. In this work, creep rupture tests were carried out in the temperature range of 620 to 660 °C in static air and in corrosive environments. The corrosive environments included 100 % Na2SO4, 100 % V2O5 and a 80 % V2O5 + 20 % Na2SO4 mixture.
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