Compacted graphite iron

Compacted graphite iron (CGI), also known as vermicular graphite iron (GJV, VG,[1] JV[2] or GGV from the German: "Gusseisen mit Vermiculargraphit"[3]) especially in non-English speaking countries,[4] is a metal which is gaining popularity in applications that require either greater strength, or lower weight than cast iron.

Schelleng obtained a patent for the production of compacted graphite iron in 1965.

[6] The first commercial application for compacted graphite iron was for the brake discs for high-speed trains.

[7] More recently compacted graphite iron has been used for diesel engine blocks.

It has proven to be useful in the manufacture of V topology diesel engines where the loading on the block is very high between the cylinder banks, and for heavy goods vehicles which use diesel engines with high combustion pressures.