Thermofriction hardening of steels is a modern technology for extended use in the production of various parts, the surfaces of which require increased wear resistance. The presented research continues the work of the authors on the study of the transformation and properties of metal structures that have received frictional processing; identification of physical mechanisms of steel hardening and the formation of ideas about residual manifestations and support of the strength heredity of intense frictional contact in the subsequent life cycle of the part at the final operations of its shaping and operation under conditions of thermophysical loading similar to tempering. This study examines the behavior of surfaces hardened by thermofrictional treatment under conditions of subsequent operational thermal loading, which is simulated by heating to elevated temperatures (up to 600 °C) and holding steel at these temperatures for up to one and a half hours. Metallographic and durametric studies have been carried out on cross-sectional sections of 65G steel samples. The microhardness in the near-surface layer decreases the more, the higher the heating and the time of testing with an elevated temperature. At the same time, the surface of steel that has previously undergone thermofrictional hardening is much harder than its base in the entire range of experimental conditions. This indicates the prospects of thermofriction hardening for steel products operating under conditions of increased thermal loads, and stimulates further research in this direction.