... machiningprecise cutting, drilling, tapping,CNC milling,CNC lathe and so on.Surface treatment polishing,brushing,anodized, electroplate,powder coating, sandblasting,painting , so ... on. 2, Typical chemical composition (GB/T3190) Aluminium GradeSiFeCuMnMgCrZnTiimpurityAl60630.2-0. ...