... iron; Malleable iron; Tungsten steel, etc.2. Machining processes: Metal fabrication, machining, welding, forming, shaping, punching, drilling, turning, milling, grinding, chip ... , deep drawing, bending, spot or seam welding, spinning, forging, sand casting, die casting, investment casting, etc.3. Surface treatment: Polishing, zinc plating, nickel plating ...