A heated billet is pressed through a die with great force
and the finished profile emerges from the die. Cooling takes place
immediately, by air or water. To ensure that the profiles are straight,
the profiles are stretched after cooling. At the same time, they are
checked to ensure that all key functional dimensions are correct and
that the surface quality is as desired. The profiles are then cut to the
appropriate length. The material is then subjected to an appropriate
heat treatment to bring it to its required permanent level of strength.