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80-55-06X Ductile Iron

80-55-06X is a grade of ductile iron available in larger rounds and rectangles. This grade tends to contain more pearlite making the material a good fit in applications where considerations to wear resistance and surface finish are required. The additional pearlite also makes this material responsive to heat treating, like through-hardening and surface hardening. Download the 80-55-06X Product Brief, or X Products for all X grades.

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 a mixture of ferrite and pearlite. Chill carbides will be less than 5% in any field at 100x and will be well dispersed.

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

Chemical Composition

Magnesium is added as an inoculant to produce nodular graphite. Small amounts of alloying elements are used to stabilize the pearlitic structure.

Carbon3.20 – 3.85%
Silicon2.20 – 3.10%
Manganese0.10 – 0.55%
Sulfur0.02% Max
Phosphorus0.08% Max

Mechanical Properties

Hardness properties listed are minimum and maximum across the bar. For rectangles and squares the hardness properties will depend on minimum and maximum section thickness and will be supplied on request.

Size Ranges

1.000 - 28.00025 - 711



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

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

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