RESTORATION METHOD OF WORN-OUT SURFACES OF STEEL PARTS Russian patent published in 2014 - IPC B23P6/00 C23C4/04 

FIELD: metallurgy.

SUBSTANCE: invention relates to a procedure of restoration of worn-out surfaces of steel parts based on self-fluxing alloys having high resistance to abrasive wear, resistance to corrosion and oxidation in combination with excellent antifriction properties in a wide temperature range and operating under conditions of corrosive medium and intense wear. The method involves gas-plasma sputtering of a wear-resistant layer by applying a mechanical mixture from a multicomponent self-fluxing powder alloy and powder tungsten carbide in the quantity of 38-43% of the multicomponent self-fluxing powder alloy, fusion of the coating surface is performed at the temperature of 1150-1180°C; after that, exposure of parts is performed in a thermal container after it is cooled down to the temperature of 500°C and two-stage heat treatment including hardening of parts from temperature of 830-860°C with cooling in industrial oil to the temperature of 650-720°C and exposure to the temperature of natural cooldown; after that, mechanical processing of the applied coating to the nominal size of the part is performed; with that, the multicomponent self-fluxing powder alloy contains silicone, iron, carbon, boron, chrome and nickel at the following component ratio (parts by weight): silicone 2.4-3.4, iron 3.0-7.0, carbon 0.3-0.6, boron 1.7-2.5, chrome 8.0-14.0, nickel is the rest.

EFFECT: invention allows increasing physical and mechanical properties of the parts being restored and excluding initiation of cracks in a coating at hardening, for example of plungers of high-pressure pumps of drilling equipment in oil industry.