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80-55-06 Ductile Iron

Dura-Bar 80-55-06 ductile iron will contain nodular graphite in a matrix of ferrite and pearlite. The pearlite/ferrite structure provides higher wear resistance and strength when compared to a ferrite grade of ductile iron. This material is readily machinable with good surface finishes. Tensile and yield strengths are similar to AISI 1040 steel in the as-rolled condition. This specification conforms to ASTM A536 grade 80-55-06. Download the 80-55-06 Ductile Iron Product Brief.

Typical Applications:



Fluid Power

Cylinder blocks, Gerotors, Glands, Manifolds, Pistons, Rotors, Valves


Barrell Rollers, Bushings, Chain Sheave Rollers, Chuck Bodies, Die Blocks, Flywheels, Gear Racks, Gears, Housings, Pile Drivers, Press Rams, Pulleys, Rams, Rotary Tables, Tie Rod Nuts


Core Boxes, Dies, Disamatic Pouring Rails, Grinding Rolls, Mill Liners , Pattern Plates, Plunger Pin

Power Transmission

Gears, Pulleys

Pump and Compressor

Gears, Housings,  Liners, Pistons, Rotary Screws, Rotors

Steel Mill

Guide Rolls, Pinch Rolls, Runout Table Rolls


Gears, Motorcycle Disk Brake, Pulleys, Rail Spacers


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

A graph detailing the microstructure of the 80-55-06

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. Small amounts of alloying elements are used to stabilize the pearlitic structure.

Sulfur0.025% Max
Phosphorus0.05% 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 Ranges




Tensile strength is determined from a longitudinal test specimen taken from mid-radius of the as-cast bar. In bars under 1.5" diameter, elongation will be 4% minimum.

Mechanical Properties
Tensile strength psi (min)80,000
Yield strength psi (min)55,000
Elongation (min)6%

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