METHOD OF MANUFACTURING RAILS OF LOW-TEMPERATURE RELIABILITY Russian patent published in 2016 - IPC C21D9/04 B21B1/08 

FIELD: metallurgy.

SUBSTANCE: invention relates to ferrous metallurgy, in particular. Rails are rolled at mill with universal mill tandem at heating temperature for rolling in range of 1,100 to 1,200 °C, finish rolling is performed at temperature of 850-950 °C, and accelerated and differentiated cooling at head and rail foot is performed by air or air with admixture of water from temperature 720-850 °C at a rate of 1.5-6.0 °C/s to temperature of ≤ 620 °C, where in each specific case cooling rate at head differs from cooling rate at bottom. Said steel contains following substances, wt%: carbon - 0.72-0.78 and optionally additionally: from 0.15 to 0.60 chromium, from 0.10 to 0.60 nickel, from 0.05 to 0.15 vanadium, from 0.007 to 0.020 nitrogen.

EFFECT: obtaining rails of low-temperature reliability with perlite microstructure, having high level of impact strength and impact drop strength at negative temperatures, as well as required system of mechanical properties and low level of residual stresses.

1 cl, 3 tbl