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In this study, durability and tribological properties of thermally sprayed WC-Cr-Ni cermet coatings were investigated experimentally under lubricated pure rolling or rolling with sliding contact conditions. Coatings were deposited by the high velocity oxy-fuel flame spraying (HVOF) process onto the carburized hardened steel substrate. The WC cermet coated steel roller was mated with the noncoated carburized hardened steel roller under a contact pressure of PH=1.2 or 1.4 GPa in line contact condition. It was found that durability or life of the cermet coating is significantly influenced depending on the contact pressure, slip ratio and coating thickness. Durability or life of the coating was also compared with the durability when the substrate material was an induction hardened steel or a thermally refined steel. Furthermore, it was observed that tribological properties such as coefficient of friction and surface temperature were much affected by the slip ratio and slightly affected by the contact pressure. In addition, after the running-in process it was found that surface roughness of the coated surface was remarkably influenced by the slip ratio and it was less influenced by the contact pressure. [ABSTRACT FROM AUTHOR]