METHOD FOR HARDENING OF LOW- AND MEDIUM-CARBON STEEL Russian patent published in 2019 - IPC C21D1/78 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy and relates to method of increasing strength of steels, in particular, method of hardening of low- and medium-carbon steels, and can be used in production of parts of structures and machines. Three-time thermal cycling of steel is performed by heating at rate of 1 mm/m, holding in the furnace and cooling, at that furnace temperature 300 °C, holding in the furnace after heating the entire cross-section is 3–5 minutes, and cooling is carried out in calm air.

EFFECT: improving hardening efficiency and simplifying the technology of hardening of steel strength.

1 cl, 5 dwg, 2 tbl