Ductile iron profiles are mainly alloys composed of iron, carbon, and silicon, in which the carbon content exceeds the amount that can be retained in the austenite solid solution at eutectic temperature. The graphite balls in its organization are small and round, with a high spheroidization rate and a large number of balls. There are no intergranular carbides, and its mechanical properties combine high strength and high plasticity.
It is precisely because of its unique composition and characteristics that ductile iron profiles have a uniform and dense structure, good pressure resistance and airtightness; Strong anti-wear performance, smooth surface quality, high dimensional accuracy, small machining allowance, uniform hardness distribution, high tensile strength, no shrinkage, porosity, slag inclusion, sand holes and other defects, superior mechanical properties and a series of advantages, among which the most prominent are its combination of high strength and high toughness, as well as excellent fatigue resistance.
Do you know how ductile iron profiles are formed? It is very simple. First, the gray cast iron is obtained by spheroidizing treatment, and the precipitated graphite is spherical; Spheroidizing of ductile iron means that the size of metal particles decreases, which also improves the strength and hardness of the material.
Subsequently, the ductile iron was subjected to normalizing treatment with the aim of obtaining a pearlite matrix structure, refining grains, and achieving a uniform structure to improve the mechanical properties of the castings. Sometimes normalizing is also a preparation for surface quenching of ductile iron on the structure, and normalizing can be divided into high temperature normalizing and low temperature normalizing.
The high-temperature normalizing temperature of ductile iron profiles generally does not exceed 950-980 ℃, and low-temperature normalizing is generally heated to the co bending temperature range of 820-860 ℃. After normalizing, it is generally necessary to perform a four person treatment to eliminate the internal stress generated during normalizing. Due to its higher strength, better toughness, and plasticity compared to ordinary gray cast iron, ductile iron profiles are often used in the manufacturing of internal combustion engines, automotive components, and agricultural machinery.
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