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65-45-12X Ductile Iron

65-45-12X is an all-purpose grade of ductile iron available in larger sizes of rounds and rectangles/squares. With medium strength and ductility, 65-45-12X can be a suitable alternative to low and medium carbon steels. A predominantly ferritic matrix allows for it to be machined as opposed to steels and pearlitic irons, and it is appropriate for applications necessitating fatigue strength and ductility. Download the 65-45-12X Ductile Iron Product Brief, or X Products for all X grades.

A pile of 65-45-12X Ductile Iron rods stacked on one an other

Typical Applications:



Fluid Power

Cylinder Blocks, End Caps, Gear Rack Housings, Gerotors, Glands, Manifolds, Pistons, Rotors, Valves

Glass Mold

Bank Molds, Plungers


Bushings, Chuck Bodies, Die Blocks, Flywheels, Gears, Housings, Journals, Pulleys, Rams, Rotary Tables, Side Frames, Spindle Housings, Tie Rod Nuts


Plunger Pin

Power Transmission

Coupling Hubs, Gears, Pulleys, Sprockets

Pump and Compressor

Gears, Housings, Pistons, Rotary Screws, Rotors


Coupling Hubs, Gears, Pulleys, Rail Spacers, Sprockets


The microstructure consists of Types I & II nodular graphite as defined in ASTM A247. The matrix is ferrite with approximately 5–25% pearlite. The edge or rim will have a higher nodular count and will be mostly ferrite. Chill carbides will be less than 5% in any field at 100x and will be well dispersed.

A graph detailing the microstructure of the 65-45-12X

Chemical Composition

Magnesium is added as an inoculant to produce nodular graphite.

Sulfur0.02% Max
Phosphorus0.08% 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.

Mechanical Properties
Tensile strength psi (min)65,000
Yield strength psi (min)45,000
Elongation (min)12%

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