Compacted Graphite combines the heat dissipation of gray iron with the strength and modulus of elasticity of ductile iron. Those properties are achieved through the microstructure of the iron, combining vermicular graphite with nodules.

The maximum allowable nodular graphite present is 20% with no gray flake allowed. Nodularity is section size sensitive and it is difficult to maintain a 20% maximum in section sizes below 1/4 inch. The compacted graphite structure is controlled through careful monitoring of the base sulfur level. All alloy additions are calculated from that base iron.

The final structure is achieved through careful weighing of Mg-Fe-Si and Fe-Si-Ca-Ti alloys. Consistency is the key to producing Compacted Graphite. We pour it every day, to produce castings which go into our power steering gears and a varied outside customer product line.

The as-cast grades produced are Grade 300 to Grade 450. We also produce an annealed Grade 250. The as-cast grades will provide the following range of physical properties: tensile 43,000-65,000; yield 30,000-46,000; and elongation of 1-1.5%. Hardness ranges are 143-269 BHN.

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