Enhanced Performance

Author Charles M. Boyles
February 01, 2001 - 11:00am

The use of compacted graphite iron is continuing to grow, particularly for automobile castings. The benefits of CG iron vs. gray cast iron are its ability to handle heat better and better machinability. The author gives an overview of the material's characteristics and discusses feed-and-speed considerations when machining CG iron.

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Related Glossary Terms

  • compacted graphite iron

    compacted graphite iron

    Cast iron having a graphite shape intermediate between the flake form typical of gray cast iron and the spherical form of fully spherulitic ductile cast iron. Also known as CG iron, CGI or vermicular iron, it is produced in a manner similar to that of ductile cast iron but using a technique that inhibits the formation of fully spherulitic graphite nodules.

  • machinability


    The relative ease of machining metals and alloys.


Charles M. Boyles, CPE, is technical editor for Cutting Tool Engineering.