... ; Ductile iron; Malleable iron; Tungsten steel, etc. 2. Machining processes: Metal fabrication, cnc machining, welding, forming, shaping, punching, drilling, turning, milling ... seam welding, spinning, forging, sand casting, die casting, investment casting, mim,etc. 3. Surface treatment: Polishing, zinc plating, nickel plating, chrome ...