Ductile cast iron
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Graphite cast iron is a common casting in the casting industry, made of ductile iron. Ductile iron is a kind of high strength cast iron material, with good mechanical properties and processing properties, widely used in machinery manufacturing, automobile manufacturing, construction, chemical industry and other fields. In order to produce excellent nodular cast iron, the majority of foundry workers have done a lot of research on its technology.
In the production of nodular cast iron, it should be noted that the eutectic solidification of nodular cast iron is a typical paste solidification method, which has a process of primary (liquid) contraction, volume expansion and secondary contraction before solidification. During the solidification process, when the adjacent eutectic clusters contact each other, the iron liquid located in the gap between the eutectic clusters is isolated from the outside, resulting in a serious lack of carbon in the solidified iron liquid, and the shrinkage (that is, secondary shrinkage) generated by the solidification of this part of the iron liquid can not be supplemented, thus forming a microscopic shrinkage. Therefore, ductile iron will have many defects in the casting production, such as shrinkage hole, shrinkage loose, slag inclusion, subcutaneous porosity, etc., and it is easy to form batch scrap.
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