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Home > Tips and Facts > Understanding Cast Irons > Compacted Graphite Iron
Understanding Cast Irons - Compacted Graphite Iron
CGI became commercially available as dependable methods for its production were developed. Its graphite occurs as blunt flakes that are interconnected within each cell. This graphite structure and the resulting properties of the iron are intermediate between gray and ductile irons. The compacted graphite shape has been known for some time and also has been called quasiflake, aggregated flake, seminodular and vermicular graphite.
Its production is similar to that for ductile iron in requiring close metallurgical control and rare earth element additions, but it also requires another alloying element such as titanium to minimize the formation of spheroidal graphite. CGI retains much of the castability of gray iron, but has a higher tensile strength and some ductility. Its matrix structure can be adjusted by alloying or heat treatment.
These scanning electron microscope (SEM) views illustrate the various forms of graphite found in the cast iron family.
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Atlas Foundry Company, Inc.
601 N. Henderson Avenue
Marion, IN 46952-3348
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