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Gray Iron vs. Ductile Iron

Ellwood Engineered Castings pours both  ductile and gray iron. Gray iron is a hard brittle material with excellent damping characteristics and good machinability. This is due to graphite flakes which precipitate into the iron during solidification. Gray iron has found its way into a variety of applications over the years including most of EEC’s Ingot Molds. A great thermal conductor with great wear resistance, gray iron is the engineering alloy to suit your needs. 
 
Ductile Iron is a unique engineering alloy that is similar to gray iron except that it is not brittle. The material is able to flex and has more fatigue resistance than gray iron. These properties are a result of creating graphite nodules instead of graphite flakes during solidification. Ductile iron boasts more strength and flexibility than gray iron while also featuring impact resistance. With a wide range of properties, ductile iron can meet your toughest needs.
 

Ductile Iron Microstructure

Ductile Iron Microstructure

Gray Iron Microstructure

Gray Iron Microstructure