FIELD: metallurgy.
SUBSTANCE: invention relates to metallurgy, specifically to chemical-thermal treatment, and can be used in machine building to ensure increase of operational characteristics of machine parts. Method of surface hardening of steel item includes application of boron-containing coating and subsequent thermal treatment. Boron-containing coating applied on surface of steel article is a homogenised mixture consisting of phenol-formaldehyde resin with coke number in hardened condition of not less than 52 % (A), boric anhydride (B) and iron carbonyl (C) in ratio A:B:C from 90:8:2 to 50:40:10, followed by two-step heat treatment. First step involves heating to 200-350 °C for 2-8 minutes using an infrared lamp, and second step involves heating to ensure temperature of coating of 850-1,000 °C due to action of gas-flame burner for 10-30 minutes.
EFFECT: higher efficiency of penetration of boron-containing components, reduced temperature and time of saturation of steel surface and simple process.
1 cl, 1 tbl, 1 ex
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