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00261 APPLICATION OF COMPOSITE TUBES PLASMA-WELD-OVERLAID WITH Ni-Cr-Mo ALLOY FOR SUPERHEATER APPLICATIONS IN WASTE INCINERATORS

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Product Number: 51300-00261-SG
ISBN: 00261 2000 CP
Author: Y. Takeuchi, K..Kawahara, T. Hosoda
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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-lMo) 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 HRllN (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. Keywords: waste incinerator, weld overlay, high temperature corrosion
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-lMo) 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 HRllN (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. Keywords: waste incinerator, weld overlay, high temperature corrosion
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