With properties similar to certain types of steel, ductile iron is a good, inexpensive alternative that can be used in casting parts.
Ductile iron is an alloy made from iron, carbon and silicon. It contains graphite in the form of nodules, which eliminates the risk of crack propagation. For that reason, it is more resistant than gray iron. Although its properties are similar to those of steel, its cost is much lower. In addition to sharing many properties with gray iron (ease of molding, ease of machining, resistance to compression, abrasion and wear), ductile iron displays the following characteristics:
Ductile cast iron is obtained by adding magnesium to molten cast iron. This delays the solidification process and causes spherical graphite nodules to appear.
|Ductile iron properties|
|ASTM A-536 Grade||Yield strenght (PSI)||Elastic limit||Elongation %||Typical Brinell hardness|
|60-40-18||60 000||40 000||18||174-217|
|65-45-12||65 000||45 000||12||179-228|
|80-55-06||80 000||55 000||6||207-241|
|100-70-03||100 000||70 000||3||228-269|
|Equivalent grades of ductile iron|
|ASTM A-536 Grade||DIN 1693||EN 1593||ISO 1083|