The presence of reducing/sulfidizing combustion gases in Mle lower fur
nace of utility boilers can lead to accelerated corrosion wastage on t
he furnace walls. The corrosion has been attributed to the formation o
f hydrogen sulfide (H2S) that attacks the furnace walls, primarily via
sulfidation. In a previous laboratory study, the corrosion rates of s
everal Fe-base alloys were determined as a function of three key indep
endent variables (i.e., H2S concentration in the flue gas, Cr concentr
ation in the alloy, and metal temperature). The results were used to d
efine the trend of corrosion data, regression of the variables individ
ually. To better utilize the previous corrosion data,regression analys
is was performed to correlate the corrosion rates of these alloys with
the three variables simultaneously. From this analysis, simple mathem
atical equations were generated that were capable of predicting corros
ion rates of Fe-base alloys exposed lo reducing/sulfidizing boiler env
ironments. The accuracy of the equations was evaluated by comparing pr
edicted and actual corrosion rates of a low-alloy steel from the furna
ce wall of a partial combustion-fired utility boiler. A reasonable agr
eement was obtained.