after leaving the furnace, a steel billet is hydraulically pushed
through a forming die using a ram with an extrusion force of 2.200 tons to form a profile strand.
While hot extrusion is primarily suited for highly complex profile shapes and small lot sizes, the forming technique of hot rolling
is used in most other cases. Here red-hot iron billets, so-called slabs, are passed through two oppositely rotating rollers to form profile strands.
The rollers, which are arranged over each other in a rolling stand, have a
diameter of up to 70 cm and a length of up to 2.8 meters. They are made of solid steel and weigh several tons. On the surface the rollers have
a circumferential rib profile, whose contours in conjunc-
tion with the distance
between the rollers in the rolling stand determine the geometric shape of the end product. In this way, an almost unlimited assortment of possible profile shapes can be produced with simple or compli-
cated cross sections.