HVOF sprayed Cr3C2-NiCr cermet coating was investigated to improve the erosion resisting performance of the coal burning boiler tube exposed by fly ash erosion. SUS 310S stainless steel substrate was used to examine the effect of surface treatments. HVOF coating was compared with the calorizing treatment. Coating microstructure, mechanical properties such as hardness and sand blast erosion resistances, and high temperature oxidation resistance were examined. Erosion resisting performance and durability of the HVOF sprayed Cr3C2-NiCr cermet coating were superior to those obtained from the calorizing surface treatment.

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