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00232 Evaluation of Clad Tubing after 18 Years of Service in a Coal-Fired Utility Boiler

Picture for 00232 Evaluation of Clad Tubing after 18 Years
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Product Number: 51300-00232-SG
ISBN: 00232 2000 CP
Author: M. G. Fahrmann and G. D. Smith
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Co-extruded clad tubing that had experienced approximately 18 years of service in the heat exchanger sections of a coal-fired utility boiler was examined with respect to flue gas / coal ash corrosion on the O.D., steam corrosion on the I.D., and retention of mechanical strength on part of the alloy 800H core. The corrosion-resistant cladding (a 50Ni-50Cr alloy) generally performed well, exhibiting pitting only at a very few locations where the most severe environment had prevailed. Corrosion of the alloy 800H cores on the steamside was negligible. Tensile and stress-rupture strength of the 800H cores actually increased during service, while tensile ductility dropped moderately remaining within acceptable levels. Keywords : boiler, clad tubing, alloy 800H, flue gas, deposit, steam, corrosion, strength
Co-extruded clad tubing that had experienced approximately 18 years of service in the heat exchanger sections of a coal-fired utility boiler was examined with respect to flue gas / coal ash corrosion on the O.D., steam corrosion on the I.D., and retention of mechanical strength on part of the alloy 800H core. The corrosion-resistant cladding (a 50Ni-50Cr alloy) generally performed well, exhibiting pitting only at a very few locations where the most severe environment had prevailed. Corrosion of the alloy 800H cores on the steamside was negligible. Tensile and stress-rupture strength of the 800H cores actually increased during service, while tensile ductility dropped moderately remaining within acceptable levels. Keywords : boiler, clad tubing, alloy 800H, flue gas, deposit, steam, corrosion, strength
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