... Steel, Carbon Steel, Alloy Steel, Ductile Iron, Grey Iron, Copper, Aluminum Bronze, Malleable Iron, and etc. 2. Investment Casting, Sand ... Casting (Resin Sand Casting, Green Sand Casting), Permanent Casting, Die Casting, Centrifugal Casting, Forging and ... 3. Machining Types: Machined by Round Bar and steel plate, Drilling, Milling, Turning, Boring, ...