Ductile iron castings have been used in almost 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 service conditions, there are many grades of ductile iron, which provides a wide range of mechanical and physical properties.

Most ductile iron castings, as specified by ISO 1083, are mainly produced in non alloy state. Obviously, this range includes high strength grades with tensile strength greater than 800 n / mm2 and elongation of 2%. The other extreme is the high plasticity grade, whose elongation is more than 17%, while the corresponding strength is low (370 n / m2 mm). Strength and elongation are not the basis for designers to select materials, and other decisive important properties include yield strength, elastic modulus, wear resistance and fatigue strength, hardness and impact properties. In addition, corrosion resistance and oxidation resistance as well as electromagnetic properties may be critical for designers. In order to meet these special applications, a group of Austenitic Ductile Iron, usually called Ni resis ductile iron, has been developed. These Austenitic Ductile Irons are mainly alloyed with nickel, chromium and manganese and are listed in international standards.

It is pearlitic nodular cast iron, with medium and high strength, medium toughness and plasticity, high comprehensive performance, good wear resistance and vibration absorption, and good casting process performance. It can be changed by various heat treatments. It is mainly used for crankshaft, camshaft, connecting shaft, connecting rod, gear, clutch plate, hydraulic cylinder block and other parts of power machinery.