HIGHLY-STRESSED FULL WHEEL AND A TYRE FOR RAILWAY DRIVING VEHICLES AND WAGONS AND METHOD OF THEIR HEAT TREATMENT

摘要

steel of round and nu00e1kolku consists of 0.38 to 0.42% by mass. carbon, max 0,25% by mass. silicon, 0.40 to 0.60% by mass. manganese, max. 0012% by mass. phosphorus, max is. 0005% by weight. sulphur, 1.00 to 1.50% by mass.chromium, 0? 30 to 0.60% by mass. molybdenum, 0.70 to 1.20% nickel, 0015 to 0040% by mass. aluminium and may. 0008% by mass. nitrogen.in the thermal treatment of the wheels and nu00e1kolku first conducts tempering heating at temperature of 850 to 950.sup.o.n.c and subsequent rapid cooling in the water or oil to room temperature.subsequently popuu0161tu011bnu00ed ohu0159u00e1tu00edm to a temperature of 600 to 680.sup.o.n.c followed by cooling air with the room teplotou.u0155