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Add Rare Earth To Improve Performance
Dec 05, 2018

In the acid-resistant ductile iron, the rare earth high-silica ductile iron produced in China is finer, more uniform and denser than the ordinary high-silicon cast iron. Therefore, the corrosion resistance is improved by 10% to 90%, and the mechanical strength is also significantly improved.

Rare earths can spheroidize graphite. Since H. Morrogh first used spheroidal graphite cast iron, many people have studied the spheroidizing behavior of various rare earth elements, and found that strontium is the most effective spheroidizing element, and other elements have varying degrees of spheroidizing ability.

Ductile iron castings have been used in almost all major industrial sectors, requiring high strength, plasticity, toughness, wear resistance, resistance to severe thermal and mechanical shocks, high or low temperatures, corrosion resistance and dimensional stability. In order to meet these variations in the conditions of use, ductile iron has many grades that provide a wide range of mechanical and physical properties.

It is a pearlitic spheroidal graphite cast iron with medium and high strength, medium toughness and plasticity, high comprehensive performance, good wear resistance and vibration damping, and good casting process performance. It can be changed by various heat treatments. Mainly used in various power machinery crankshafts, camshafts, connecting shafts, connecting rods, gears, clutch plates, hydraulic cylinders and other components.

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