The heat treatment is used in order to improve the performance parameters of railcar casting. At the Tikhvin Freight Car Building Plant this process is performed in rotary kilns and each product type has its own processing method: frames and bolsters are normalised for 3.5 hours at 920°С, couplers are additionally tempered at 450°С for 4 hours.
Castings are prepared to heat treatment
Heat treatment charging conveyor
Working at the heat treatment operator’s desk
Castings after leaving heat treatment – before the cooling conveyor
Rotary kiln, front view