Ductile iron castings have almost been used in all major industrial sectors, which require high strength, plasticity, toughness, wear resistance, severe thermal and mechanical shock resistance, high or low temperature resistance, corrosion resistance, and dimensional stability . In order to meet these changes in conditions of use, ductile iron has many grades that provide a wide range of mechanical and physical properties. It is a pearlite nodular cast iron with medium to high strength, medium toughness and plasticity, high comprehensive performance, good wear resistance and vibration damping, and good casting process performance. Its properties can be changed by various heat treatments. Mainly used for a power machine of the crankshaft, the camshaft, the connecting shaft, connecting rod, a gear, a clutch plate , the cylinder body and other parts.