Ductile iron, also called ductile cast iron, spheroidal graphite iron, or nodular cast iron, is a type of cast iron invented in 1943 by Keith Millis. While most varieties of cast iron are brittle, ductile iron is much more flexible and elastic, due to its nodular graphite inclusions.
In 1949, Keith Millis, Lee Aunkst, Albert Gagnebin and Norman Pilling received a US patent on ductile iron production via magnesium treatment.
A recent development in ductile iron metallurgy is austempered ductile iron where the metallurgical structure is manipulated through a sophisticated heat treating process.
Other elements such as copper or tin may be added to increase tensile and yield strength while simultaneously reducing elongation. Improved corrosion resistance can be achieved by replacing 15% to 30% of the iron in the alloy with varying amounts of nickel, copper, or chromium.
Ductile iron is specifically useful in many automotive components, where strength needs surpass that of aluminum but do not necessarily require steel. Other major industries off-highway diesel trucks, class 8 trucks, agricultural tractors, and oil well pumps.
Ductile iron producers examine markets, processes. (iron industry conference in Chicago, Illinois sponsored by Georg Fischer AG)
Nov 01, 1990; More than 100 metalcasters from 14 countries converged on Chicago Sep 18-20 for an update on current ductile iron practices,...
Ductile iron proves effective with HDD, pipebursting: study counters common misconceptions regarding ductile iron pipe.
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