Ductile Cast Iron

Definition - What does Ductile Cast Iron mean?

Ductile cast iron refers to a type of metal substance that has substantial fatigue, impact and corrosion resistance due to the spherical (round) graphite distributions in its molecular structure.

Ductile cast iron has significantly more carbon (3.0% - 3.9%) than other forms of iron such as cast steel, which normally has a carbon content of 0.08% - 0.60%. This difference accounts for its unique response to corrosion.

Corrosionpedia explains Ductile Cast Iron


Ductile cast iron has a graphitic layer. When corrosion is initiated the graphite accumulates as a graphitic layer on the metal's surface. The adhesion and porosity of this layer influences the subsequent corrosion and galvanic behavior of ductile cast iron.

Types of ductile cast iron include:

  • Ferritic ductile iron – Graphite spheroids in a matrix of ferrite
  • Ferritic pearlitic ductile iron – The most common grade of ductile iron
  • Pearlitic ductile iron – Graphite spheroids in a matrix of pearlite
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