METHOD OF FORMING A WEAR-RESISTANT COATING AND A CORROSION-RESISTANT COATING ON THE SURFACE OF STEEL PRODUCTS Russian patent published in 2022 - IPC C21D1/78 C23C2/10 C23C8/22 C23C8/46 C23C8/66 

FIELD: technological processes.

SUBSTANCE: invention relates to technologies providing increased resistance of steel products to mechanical effects and to the effects of aggressive working media by changing the composition and structure of their surface layers and can be used to increase the service life of the articles. Method of forming a wear-resistant corrosion-resistant coating on the surface of steel products involves carbonization at temperature of 1,000–1,100 °C for 3–8 hours and diffusion saturation of steel products in melt containing lead, lithium and chromium, at temperature 950–1,050 °C for 2–5 hours at the following ratio of components, wt%: lead — 94.2–98.5, lithium — 0.5–0.8 and chromium — 1–5. Then heat treatment is carried out, including surface hardening at temperature of 780–850 °C and tempering at temperature of 150–180 °C.

EFFECT: increased wear resistance and service life of steel products under conditions of exposure to products of high contact stresses and aggressive effects of the working environment.

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