Ductile iron

Ductile iron has graphite excluded in the form of spheres. Compared to cast irons with flake graphite (grey cast iron), it has higher strength, modulus of elasticity, hardness (pearlitic matrices), ductility and impact work (ferritic matrices), etc. Cast iron with ball graphite is currently the most widely used cast iron and is sometimes used instead of steel for castings. The savings that this cast iron will bring are not negligible.

Compared to steel, ductile irons also have some other properties, e.g., lower specific gravity, good sliding properties, damping properties, better foundry properties, easier machinability, etc.

Cast iron is supplied in UNIBAR 400-15 to UNIBAR 700-2 grades, mostly in round and square cross-sections or in general cross-sections (on special order). A large percentage of deliveries are thick-walled casings (hollow sections/tubes).