With hot forged parts, secondary machining operations become increasingly difficult to work with due to hardening of the metal. That being said, there are post machining methods on non-forged metal works that can be used to increase hardness e.g. heat treatment.
Each type of metal has different properties that affect hot forging temperatures, aluminium can be forge at almost half that of steel, the tolerance range before cracking or alternatively folding is much less than the former. Aluminium alloy forged parts are typically used in the aerospace and automotive industries as they provide the tensile strength of medium strong steel alloys without the considerable weight penalty.
At this time JPen employs some cold forging operations including rolling and forming which are intrinsically cost effective to customers requiring time sensitive fabrication projects featuring suitable strength characteristics.