In this investigation, ring-compression tests have been carried out on commercially pure titanium, both with the recommended lubricant MoS 2 and without lubricant, to evaluate the interface constant shear friction factor. The tests were conducted in the temperature range of from 303 to 573 K and the strain-rate range of from 0.07 to 32 s −1. The results of the investigation reveal that the friction factor for the combination commercially pure titanium (as the work material) and high-speed steel (as the tools) increases with strain rate and temperature and that MoS 2 is a satisfactory lubricant up to a temperature of 473 K.