Sistem Teknik designs and builds continuous T-6 heat treatment lines for aluminium castings. While heat treatment includes a solvus curve, the process consists of solution annealing, quenching, and aging. Depending on the material cross-section, the average solution period is as the following:
- Heating from 20 °C to 540 °C in 1.5 hours,
- Holding at 540 °C for 4-5 hours.
The material is dipped into the quenching tank for a total of 7 seconds (from the moment the door starts to open). The maximum temperature of the furnace is 650 °C while the heating is provided by recuperative burners or hairpin resistors.
The design of the furnace elevator and door allows the loss of time between solution annealing and quenching to be minimised. The temperature homogeneity in the oven is ± 5 ° C while the air is circulated with the help of the fan(s).
The temperature homogeneity of the water in the tank is also ± 5 °C. The control of the water level in the tank and automatic water supply system are available in case of a decrease in the water level. Air and water temperatures in the furnace and water tank respectively are controlled and recorded in the SCADA system continuously.