... ; Tinplate, copper; Stannum bronze; Silicon bronze; Zinc alloy; Gray iron; Ductile iron; Malleable iron; Tungsten steel, etc.Machining processesMetal fabrication, machining, welding, forming, shaping ... drawing, bending, spot or seam welding, spinning, forging, sand casting, die casting, investment casting, etc.Surface treatmentPolishing, zinc plating, nickel plating, chrome plating ...