Ductile Iron


Dura-Bar ductile iron is a cost-saving alternative to low-medium carbon steels and has similar strengths with excellent free machining properties. The nodular graphite provides the same free machining benefits as lead, without creating the machining and waste disposal problems. Ductile grades will conform to ASTM A536, with the primary difference being the high nodule count and fine grain size inherent to the Dura-Bar continuous casting process. The different grades are produced by controlling the matrix structure around the graphite nodules.

Iron Stock Grades Non-Stock Grades
Ductile 65-45-12, 80-55-06
65-45-12X, 80-55-06X
60-40-18, 100-70-03

Ductile Iron Grade Comparison

Grade Tensile Strength (psi) Yield Strength (psi) Elongation Fatigue Strength (psi) Extended Size Range
65-45-12 > 65,000 45,000 12 40,000  
65-45-12X > 65,000 45,000 12 40,000 Yes
80-55-06 > 80,000 55,000 6 40,000  
80-55-06X > 80,000 55,000 6 40,000 Yes
100-70-03 > 100,000 70,000 3 40,000  
60-40-18 > 60,000 40,000 18 n/a  

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