The new SU 450 is equipped with a highly sensitive sensor system, which permanently controls the reduction of the rings and provides real-time information about the reduction values on the display. The temperature is regulated automatically and very precisely close to the solidus temperature, exactly until the reduction begins. As soon as the pre-defined reduction value has been reached, the process stops automatically and so too much deformation can be eliminated (depending on composition and alloy the pre-defined reduction value lies between 0.1 mm and 0.3 mm).