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Precautions for producing ductile iron parts
Release time:
2019-10-17 17:23
Source:
Ductile iron is a high-strength cast iron material with comprehensive properties close to those of steel. Ductile iron is obtained by spheroidal graphite through spheroidization and conception treatment, which effectively improves the mechanical properties of cast iron, especially the plasticity and toughness, thus obtaining a strength higher than that of carbon steel. It is based on its excellent properties that it has been successfully used to cast some parts with complex forces and high requirements of strength, toughness and wear resistance. Ductile iron parts have developed into second only to gray cast iron, and very widely used cast iron materials. The so-called "iron instead of steel", mainly refers to ductile iron.
Ductile iron parts are made of spheroidal graphite through spheroidization and conception treatment, which effectively improves the mechanical properties of cast iron. The chemical composition of ductile iron parts must ensure that the specified ductile iron grades and corresponding mechanical properties are achieved.
Today we talk about the precautions for producing ductile iron parts.
1、Strict requirements on chemical composition, the required carbon and silicon content of the original molten iron is higher than that of gray cast iron, and the content of manganese, phosphorus and sulfur in ductile iron is reduced;
2、The temperature of the molten iron is higher than that of gray cast iron to compensate for the loss of molten iron temperature during spheroidization and breeding treatment;
3, Spheroidizing treatment, i.e., adding spheroidizing agent to the molten iron;
4、Add nurturing agent for nurturing treatment;
5、Ductile iron has poor fluidity and large shrinkage, so it needs higher pouring temperature and larger pouring system size, reasonable application of riser, cold iron, and sequential solidification principle;
6、Ductile iron parts need to be heat treated.
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Ductile iron is a high-strength cast iron material with comprehensive properties close to those of steel. Ductile iron is obtained by spheroidal graphite through spheroidization and conception treatment, which effectively improves the mechanical properties of cast iron, especially the plasticity and toughness, thus obtaining a strength higher than that of carbon steel.
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