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Home > Science & Nature > Science > Chemistry > Ductile Iron and Cast Iron Compared

Difference Between Ductile Iron and Cast Iron

Ductile Iron vs Cast Iron

Ductile iron and cast iron are used in the metal industry on an everyday basis. However, the two alloys have different characteristics which results in them being used for various purposes.

Ductile Iron

Ductile iron was firstly created during the mid 1940’s by Keith Millis through incorporating the ferrous alloy with magnesium treatment. This shows the structural alteration of graphite, since in the development of this material, the graphite creates spherical nodules which restricts the development of fissures thereby resulting in increased malleability. It is usually utilized as a water main pipe due to its durability and resistance to corrosion.

Cast Iron

Cast iron has a vast range of properties that are being cast into shape as opposed to being formed. Its production consists of re-melting pig iron and steel scrap and adding different alloys in it during the procedure. Some of those that are added are carbon and silicon. It usually contains high amount of silicon in addition to the already high carbon content. Sulfur and manganese are also added to provide strength and solidity to the metal.

Difference between Ductile Iron and Cast Iron

Cast iron is usually used for engineering and construction structures because of its stability, while ductile iron is utilized for water pipes due to its durability. Ductile iron is a newer material which is more favored, not just in terms for a water pipe fixture but also for engine parts such as crankshafts and connecting rods, plus various brakes and steering components due to its strength, reliability and flexibility. Their main difference lies in the presence of graphite, since it causes cracks, which softens the alloy, it is an important component for ductile iron but in the case of cast iron, it is eliminated.

We see these materials each day, though a regular person might not know the difference. The important thing is that they are made for a purpose and that they provide the needed support that they are developed for in the first place.

In brief:

• Cast iron is usually used for engineering and construction structures because of its stability, while ductile iron is utilized for water pipes due to its durability.

• Ductile iron is a newer material which is more favored, not just in terms for a water pipe fixture but also for engine parts such as crankshafts and connecting rods, plus various brakes and steering components due to its strength, reliability and flexibility.


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  5. Difference Between Steel and Aluminium

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  • Zeheev

    how do they looking in real life between the two?  How can one tell by looking at both which is which?

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