For the sake of completeness and information, most of the processes used for the development of nitrogen
containing surface treatments are mentioned in this section, not only those directly relevant to extrusion dies.
The reason for this inclusion is that surface treatment processes are also important to improve wear resistance
and anti scuffing properties of many engineering components as well as extrusion dies. The wear resistance of
many components used in presses and other plant items may well be treated in this way with advantage