Materials Produced

Compacted Graphite Iron Castings

Compacted Graphite Iron is also known as CGI and Vermicular Graphite Iron. This material was developed around the same time as SG Iron – Ductile Cast Iron back in the 1940’s but it is only recently that designers and engineers have started to fully utilise its unique mechanical qualities.

 

In simplistic terms CGI is neither a Grey Cast Iron nor a Ductile Cast Iron; it falls in to a category that is somewhere in-between.

 

The graphite formation in Grey Cast Iron is in the form of a flake, SG Iron

– Ductile Iron exhibits graphite in the form of spheres. Compacted Graphite

– CGI has blunt flakes that are interconnected thus offering the beneficial properties of Grey Cast Iron and SG iron – Ductile Iron.

 

Compacted Graphite Iron Castings has a greater tensile strength than Grey Cast Iron.

 

Compacted Graphite is almost twice as strong as Grey Cast Iron but it retains the ability be produced cast near to shape, and has low manufacturing costs.

 

Good fatigue properties, ease of machining, good thermal and damping properties make this an ideal choice for applications such as engine blocks, flywheels, clutch components, piston rings, turbo housings, exhaust manifolds and brake drums.