The aim behind this process is to increase the hardness of cynlinders' surface.

During the hardening phase, the clinder is heated in phases to reach a final temprature of about 890 degrees

celsius.This furnace goes up to a high temperature.

The furnace contains 12 torches and has the capacity of 26 cylinders.

The cylinder must enter the quench liquid right after the furnace. Time is the most important thing in this part.

The cylinder will be discarded if it does't enter the quech liquid in a timely manner