Under slidingfriction, nickel (0.34.2 wt.%) alloyed with chromium steel (1.2 wt.% carbon; 15 wt.% chromium) exerts a fundanzental influence upon the initial structure of the steel and the phase composition and structure of the near-surfacefriction layers. 50:50 for steels after quenching and 2575 for steels after tempering in the near-surface friction layers. The minimum wear of the steel occurs when there is a dynamic equilibrium between the dislocation densities in the a-and y-phases and a ratio between the y-and a-phases of

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Method of obtaining of cast composite materials (CCM) on the basis of aluminum reinforced by σ- phase (FeCr) is proposed. The wear rate of specimens from CCM is depended on the height of casting, which these specimens were cut out from. The average size of particles FeCr 27.5-35.5 μm and their quantity 184–263 pieces/mm2 make the greatest positive influence on wear rate of CCM under dry friction.