RAILROAD WHEEL HEAT TREATMENT METHOD Russian patent published in 2012 - IPC C21D9/34 

FIELD: metallurgy.

SUBSTANCE: cooling of working layer of rim during the first 180 sec is performed at discrete increase in flow rate of cooler of 0.0005 to 0.02 l/(cm²/s) by 0.0001 l(cm²/s) every 15-30 sec and the next 120 sec at constant flow rate of cooler to 0.5 l/(cm²/s), and cooling of end surface of rim on the ridge side is performed with air with flow rate of 0.5 m³/(cm²/s); then, wheel is cooled in the air and tempering is performed.

EFFECT: high application properties of railroad wheels owing to improving wear resistance of working layer of wheel rim and mechanical properties of wheel disc; heating to austenisation temperature and differentiated cooling of working layer of rim and its face on the ridge side is performed during 300 s.

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