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.     

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Dura-Bar 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.

Center Area

100x, etched in 5% Nital

Edge Area

100x, etched in 5% Nital


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.

Element Percentage
Carbon 3.50 - 3.90%
Silicon 2.25 - 3.00%
Manganese 0.15 - 0.35%
Sulfur 0.025% Max
Phosphorus 0.05% Max

Mechanical Properties

Hardness properties for various diameters are shown in the table.  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 Range BHN
Inches mm Min Max
2.500 - 3.500 64 - 89 148 165
3.501 - 4.500 89 - 114 151 161
4.501 - 5.500 76 - 140 152 162

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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Woodstock, IL 60098


800-BAR-MILL (227-6455)

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