... 4.Test:Tensile test,Impact test. 5.Quality Assurance. Using Investment casting parts 1. Materials:carbon steel, alloy steel, stainless steel ... ), zinc-plated, nickel-plated, chrome-plated, hot-galvanized, sandblasting, painting, powder-coating, PROCESSMATERIALSTANDARDSANDCASTINGGreen SandGrey Iron, Ductile Iron, Malleable Iron, Stanless Steel ...