Casting is a process in which solidifying metal is extracted through an open ended mold fitted with a cooling unit. Heat is extracted and the metal exist the mold as a solid with a constant cross section. It allows lower cost production of metal sections with better quality, due to finer control through automation of the casting process. Generally a saw is set up after the withdrawal rolls, in order to cut the casting at constant lengths. The castings are semi-finished products, which are further processed in extrusion, drawing, rolling or machining operations.