... per year 8. Casting Process: Investment Casting , Sand Casting, Die Casting, Lost Wax Casting, Precision Casting, Gravity Casting, CNC Machining 9. Material: Carbon Steel , Alloy Steel, Stainless Steel, Gray Iron, ... Ductile Iron, Aluminum, ect . 10. Surface Treatment: Heat Treatment, Machine, Polishing, Chrome, Zinc, Nickel Plating 11. These parts ...