In Phase I a variety of developmental and commercial tubing alloys and claddings were exposed to laboratory fireside corrosion testing simulating a superheater or reheater in a coal-tired boiler. Phase II (in situ testing) has exposed samples of 347, RA-85H, HR3C, 253MA, Fe3Al + 5Cr, 310 mndiied, 800HT, NF 709,690 clad, and 671 clad for over 10,000 hours to the actual operating conditions of a 250-MW coal-fueled boiler. The samples were tiled on an air-cooled, retractable corrosion probe, MM in the reheater cavity, and controlled to the operating metal temperatures of an existing and advanced-cycle, coal-fired boiler. Samples of each alloy will be exposed for 4000, 12,000, and 16,000 hours of operation. The results will be presented for the metallurgical examination of the corrosion probe samples atler 4000 hours of exposure.
Keywords: Coal Ash Corrosion, Superheater, Fireside Corrosion, Claddings