... are higher strength due to cold working, closer tolerances, and good surface finish. Cold extrusion is done at room ... strength due to , closer tolerances, good surface finish, and fast extrusion speeds if the material is subject to . Materials ... tin,aluminum, copper, zirconium, titanium, molybdenum, beryllium, vanadium, niobium, and steel.these are the most commonly extruded material. Aluminum box ...