Ductile cast iron has been an industry favorite since its invention in the 1940s and gradual refinement in the '50s, '60s, and beyond. The reason? The spheroidal graphite nodules that dot its infrastructure, lending structural integrity that regular cast iron (AKA gray iron) does not have.
Unlike the graphite flakes in gray iron, spheroidal graphite holds ductile iron together without fracturing as it bends and acts as a built-in buffer against wear. This results in products with greater ductility, tensile and yield strength, heat dissipation, and vibration and sound dampening properties than their gray iron counterparts.
Ductile iron castings offer a better value than steel forgings or fabrications, as a single casting can produce multiple components with a better strength-to-weight ratio (10% lighter than steel). Its ductility and other physical properties yield products with better design economy that are closer to near-net shape.
Ductile iron is composed of up to 94% iron with smaller percentages of carbon, silicon, manganese, magnesium (the nodulizer), phosphorus, sulfur, and copper. By applying the principles of physical metallurgy, our staff can tweak the composition to suit your needs.
Austempered ductile iron is often used where high strength and excellent wear resistance and fatigue strength are required. ADI is an excellent replacement for hardened steels: equal or better performance at a lower cost.