A Ni-Cr-Mo alloy, Alloy N06022 which contains 22wt.%Cr and 13wt.%Mo was investigated to evaluate the alloy’s hot corrosion resistance, especially focused on its use for superheater tubes in waste-to-energy plants. Hot corrosion tests were performed at 550°C using a synthetic ash which contained equivalent amounts of NaCl, KCl and Na2CO4. The results indicated Alloy N06022 had the desirable corrosion resistance for use as a superheater tube.

To suppress the volume of the relatively expensive Alloy N06022, a Alloy N06022/Type 304 clad tube was proposed. The clad tube was produced by the helical rolling method and consisted of a Alloy N06022 outer tube and a Type 304 inner tube. Optical microscopy revealed a normal wrought microstructure was obtained. Moreover the interface between the outer and inner tube had desirable strength. Hence, it was concluded that a Alloy N06022/Type 304 clad tube is an attractive component for superheater tube applications.

Subject
Hot corrosion, External surfaces, Materials, Corrosion resistant alloys, Tubes, Nickel chromium molybdenum alloys, Rolling, Incinerators, Interfaces, Ash, Corrosion resistance, Alloys, Wastes
Keywords:
Ni-Cr-Mo alloy, hot corrosion, waste-to-energy, clad tube, boiler tubing, waste incinerator, corrosion-resitant material
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2000
Association for Materials Protection and Performance (AMPP)
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