High temperature corrosion resistant superheater tubes are a critical component for the success of future municipal waste incinerators designed to operate with a steam temperature of 500°C and 100 ata pressure. In an effort to meet the challenge of producing such a component, 347SS tubes were overlaid with alloy 6M (Ni-20wt%Cr-1Mo) using The Plasma Powder Welding (PPW) technique. PPW overlaid tubes were placed in the third superheater of a waste incnerator pilot plant for times up to 9,600 hours. The PPW overlaid tubes exhibited excellent corrosion resistance--similar to alloy 625 (Ni-21Cr-9Mo) tubes and better than HR11N (Fe-30Cr-40Ni) tubes. This paper describes the PPW process and discusses the corrosion test results of the PPW overlaid superheater tubes tested in the pilot plant.

Subject
Costs, Materials, Corrosion resistant alloys, Materials performance, Nickel based alloys, Tubes, Solids, Plasma, Corrosion losses, Powders, Corrosion resistance, Steam, Wastes
Keywords:
waste incinerator, weld overlay, high temperature corrosion
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2000
Association for Materials Protection and Performance (AMPP)
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