... parts 1.Alloy aluminum 2. Long service life 3.OEM cast aluminum lamp post parts1.Material :Aluminum,steel 2.Process :de casting ... castingMaterials· Aluminium casting: 319, 355, A356,· Magnesium casting: A291D, AM60B· Zinc casting: ZA-12, ZA-27· Grey cast iron· Nodular cast ironProduction procedure1 ...