... after the plastic deformation of the sheet metal, the internal structure of the metal is improved and the strength of ... Steel,Aluminum, Alloy steel,Copper,Brass, etcSurfacePolishing, Galvanizing, Dacromet, Chrome plating, Nickel plating, Silving plating, Oxidation, Spraying, Black oxide ... or manufacturer ? A: We are a customized factory. Q: How long is your delivery time?A: Generally it is ...