The History Of Ductile Cast Iron
In 1943, at the International Nickel Company Research Laboratory, Keith Dwight Millis made a ladle addition of magnesium (as a copper-magnesium alloy) to cast iron – the solidified castings contained not flakes, but nearly perfect spheres of graphite. Ductile iron was born. The advantage of ductile iron is that the spheres of graphite don’t act as stress raisers but as crack arresters and are what give ductile iron its ductility.
This new form of cast iron immediately found uses where malleable iron, forgings, cast steel or steel fabrications would have been used. From this start, ductile cast iron has grown into a world class material offering cast solutions at a competitive price compared to traditional alternatives.