Grey cast iron

Grey cast iron (Unibar 200, Unibar 250, Unibar 300, Unibar 350) is a material with freely excluded graphite flakes in the iron. It has a very high compressive strength, unfortunately other mechanical properties such as ductility are adversely affected by the lamellar shape of graphite. Graphite flakes in the metal matrix reduce the tensile strength to only 100 to 350 MPa. Graphite in the form of flakes increases thermal conductivity. Another advantage is that, thanks to the free graphite in the structure, grey cast iron can be used for low stress plain bearings. It has a considerable ability to dampen vibrations and shocks.
It is easy to machine, short and brittle chips are removed. The grey cast iron is only slowly corroding.

We primarily deliver grey cast iron in round and squarecross-sections, or in general cross-sections (on special order). A large percentage of deliveries are thick-walled casings (hollow sections/tubes).