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Nodular cast iron and grey cast iron performance difference

by:BoQiao Machinery     2020-11-27
Ductile iron is in the 50 s of the 20th century developed a kind of high strength cast iron material, its comprehensive performance is close to steel, it is based on its superior performance, has been successfully used in casting some complex loading, requiring higher strength, toughness and abrasion resistance parts. Ductile cast iron has been developed rapidly for behind of gray cast iron, cast iron material application is very extensive. The so-called 'in iron and steel, mainly refers to nodular cast iron. Nodular cast iron profiles compared with grey cast iron, ductile cast iron have high tensile strength and bending fatigue limit, also has fairly good plasticity and toughness. Spherical graphite to minimize the fragmentation of the matrix effect, the minimum stress concentration effect, so its strength is very high, can and medium carbon steel was comparable to that can give full play to the performance of the matrix, and have good plasticity and toughness. Commonly used to make some require high tenacity and complicated shape, Casting performance is better than steel, but is worse than gray cast iron) Artifacts, such as internal combustion engine parts such as crankshaft, connecting rod, etc. Nodular cast iron can also commonly after heat treatment to strengthen, after heat treatment and gray cast iron is generally unable to improve the intensity ( The influence of flake graphite) 。 And the rigidity of ductile iron is better than the gray cast iron, nodular iron, but the damping capacity of a lot lower than the gray cast iron. The strength of the nodular cast iron material and the strength of the cast steel are comparable. Ductile cast iron has higher yield strength, the yield strength minimum of 40 k, and cast steel yield strength only 36 k. In most municipal application fields, such as: water, salt water, steam, etc. , corrosion resistance and oxidation resistance of ductile iron are more than cast steel. As a result of the spheroidal graphite cast iron spheroidal graphite microstructure, in less vibration ability, nodular cast iron is better than that of cast steel, thus more conducive to reducing stress. Choose one important reason of ductile iron is ductile cast iron is lower than cast steel cost. Nodular cast iron of low cost to make this kind of material is more popular, casting is more efficient, less the machining cost of nodular cast iron.
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