Ductile iron castings have been used in almost all major industrial sectors, which require high strength, plasticity, toughness, wear resistance, severe thermal and mechanical impact resistance, high or low temperature resistance, corrosion resistance and dimensional stability. In order to meet these changes in service conditions, ductile iron has many grades, providing a wide range of mechanical and physical properties.
As stipulated by the international organization for standardization iso1083, most ductile iron castings 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, which has an elongation of more than 17% and the corresponding strength is low (minimum 370 n / mm2). Strength and elongation are not the basis for designers to select materials, while other decisive and important properties include yield strength, elastic modulus, wear resistance and fatigue strength, hardness and impact properties. In addition, corrosion resistance, oxidation resistance and electromagnetic properties may be key for designers. In order to meet these special uses, a group of Austenitic Ductile Iron, commonly known as Ni Reis ductile iron, has been developed. These Austenitic Ductile iron are mainly alloyed with nickel, chromium and manganese and listed in international standards.
It is pearlescent nodular cast iron, which has the characteristics of medium and high strength, medium toughness and plasticity, high comprehensive properties, good wear resistance and vibration damping, and good casting process performance. It can change its performance through various heat treatments. It is mainly used for crankshaft, camshaft, connecting shaft, connecting rod, gear, clutch plate, hydraulic cylinder and other parts of various power machinery.