... couplings, and cups;3. Drilling components;4. Forged cylinders and mandrels; and spindles;5. Forged valve bodies and components; and6. Pistons, pins ... Roller Forging, Ring Forging, Gear Blank, Gear Wheel Materialsstructural steel, tool steel, stainless steel, heat-resistant steel, super alloys, titanium, aluminum ... , Heat Treatment Report, Dimensions Check Report High quality various material forged