Field tests using specimen racks were performed in six operating flue gas desulfurization (FGD) scrubber absorbers to determine the corrosion resistance of a 22Cr-5Ni duplex alloy, a 4% Mo-containing (Type 317LMN) stainless steel, and a 6% Mo-containing stainless steel. Type 316 stainless steel and alloy C-276 specimens served as highly-
susceptible and highly-resistant controls, respectively. The chloride levels in the six absorber slurry environments ranged from -9000 to -70,000 ppm. The pH was typically -5.5 with the slurry temperature in the 120 - 154°F (-49-68°C) range. Duplicate specimens were tested with "loose" and "tight" crevices for two exposure periods. Keywords : Stainless steels, alloy C-276, corrosion, FGD absorber, limestone slurry, field testing