1. Professional manufacturer 2. Metal machining part and gearbox 3. Machining Center,EDM 4. Heat treatment, steam treatment Hefei Bolin Advanced Materials Co ... : Carburizing and quenching in house,3. Steam treatment in house.4. Material: Cast iron, Carbon steel, Stainless steel, Alloy steel, Non ... welcome to visit our new factory! Metal Machining Part and Gearbox