60-40-18 Ductile Iron

Dura-Bar 60-40-18 is a nodular iron with a fully ferritic matrix. This iron grade’s microstructure is achieved through annealing and offers excellent ductility and impact strength. Dura-Bar 60-40-18 has the most ductility out of the ductile iron family of Dura-Bar. Annealed Dura-Bar is NACE compliant, ASTM A395, and ASTM A536. To learn more, download the 60-40-18 Ductile Iron Product Brief.

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Ductile Iron 60-40-18


The microstructure consists of Types I & II nodular graphite as defined in ASTM A247. The matrix is 100% ferrite. The edge or rim will have a higher nodular count. Chill carbides will be less than 5% in any field at 100x and will be well dispersed.

Microstructure area diagram

Center Area

100x, etched in 5% Nital

60-40-18 ductile iron microstructure at center

Edge Area

100x, etched in 5% Nital

60-40-18 ductile iron microstructure at edge


Dura-Bar Ductile 60-40-18 is a non-stock grade, which can be ordered in volume quantities from our distributors.

Technical Specifications

Chemical Composition

*Carbon and silicon targets are specified for each bar size in order to maintain mechanical properties.  Magnesium is added as an inoculant to produce nodular graphite.

Sulfur0.025% Max
Phosphorus0.05% Max

Mechanical Properties

Hardness properties are shown in the table below.  Hardness properties listed are minimum and maximum across the bar.  For rectangles, squares and shapes, the hardness properties will depend on minimum and maximum section thickness and will be supplied on request. 

Size RangeBHN

Tensile strength is determined from a longitudinal test specimen taken from the mid-radius of the as-cast bar.  

Mechanical Properties
Tensile strength psi (min)60,000
Yield strength psi (min)40,000
Elongation (min)18%

Typical Applications

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