Corrosion probes of 11 alloys were placed in 2 municipal incinerators, one refractory lined and the other a water wall. After the probes were exposed to varying temperatures, times, and conditions, some of the conclusions included: metal-wastage rates are temperature dependent; water-wall incincerators should not be used to generate high-temperature superheated steam; hydrogen chloride and sulfur dioxide in the flue gases were of sufficient concentration to be of concern and account for the types of deposits found on the tubes; roles played by the sulfur- and chlorine-containing compounds in the refuse are of great importance and are closely interrelated; zinc and lead further complicate the corrosion process; non-metallic materials should be considered as coating for wet scrubbers of incinerator gases; corrosion of incinerator grates is not a serious problem. (Author)