HEAT TREATMENT OF RAILWAY BANDS Russian patent published in 2015 - IPC C21D9/34 

FIELD: process engineering.

SUBSTANCE: invention relates to metallurgy, particularly, to heat treatment of binding bands. Railway bands made of steel containing the components that follow are subjected to heat treatment: C 0.65-0.75 wt %, Mn 0.6-0.9 wt %, Si 0.22-0.45 wt %, Cr 0.2-0.6 wt % and V 0.01-0.03 wt %. Band is heated to austenising temperature and subjected to controlled cooling nu liquid coolant or air-water mix, surface cooling being performed by water with controlled flow rate: 0.00035 l/(cm²·s) for up to 120 s, 0.00075 l/(cm²·s) for 121-150 s, 0.00115 l/(cm²·s) for 151-180 s, 0.00155 l/(cm²·s) for 181-210 s, 0.002 l/(cm²·s) for 211-300 s. Note here that side surface in the band inner diameter is air cooled with flow rate of 0.0003 m³/(cm²·s) with subsequent holding in air and tempering.

EFFECT: higher wear resistance of working play, contraction strains in working ply to 50-60 mm depth from rolling surface.

5 tbl, 1 ex