METHOD FOR HARDENING METAL PARTS AND COATING FOR THEM Russian patent published in 2022 - IPC C23C8/26 

FIELD: mechanical engineering.

SUBSTANCE: invention relates to mechanical engineering and can be used to obtain high-strength and wear-resistant coatings on rings, balls and bearing rollers. Detail made of steel, wt.%: tungsten 8.5-9.5; chromium 4.0-4.6; vanadium 1.4-1.7; carbon 0.7-0.8; manganese ≤0.40; silicon ≤0.40; nickel ≤0.35; molybdenum ≤0.3; phosphorus ≤0.03; sulfur ≤0.03; iron - the rest, after a cycle of heat treatment and grinding, dry at 100-120°C for 1-2 hours. After that, the material of the part is nitrided in an ammonia environment at 500-600°C with an exposure of 15-30 hours. Then the supply of ammonia is stopped and the material maintained at 500-600°C for 60-120 minutes. Surfaces requiring protection from nitriding are pre-applied with a protective coating. The resulting coating includes a nitrided layer 0.1-0.3 mm deep with a hardness of 900-1100 HV.

EFFECT: increasing the strength, hardness, wear resistance, endurance of the material of parts, improving the manufacturability of hardening parts.

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