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Dura-Bar grade 65-45-12 offered by Dura-Bar Metal Services #

Ductile Iron 65-45-12

Dura-Bar 65-45-12 ductile iron contains nodular graphite in a matrix of ferrite with small amounts of pearlite. Our most popular Dura-Bar grade, 65-45-12 ductile iron has excellent machinability with good surface finishes, optimal impact strengths, fatigue properties, electrical conductivity and high magnetic permeability. This iron has approximately the same tensile and yield strengths as AISI 1020 steel in the as-rolled condition. This specification conforms to ASTM A536 grade 65-45-12.


Depiction of Dura-Bar microstructure

100x, etched in 5% Nitol Center view of Dura-Bar 65-45-12 microstructure

100x, etched in 5% Nitol Edge view of Dura-Bar 65-45-12 microstructure

The microstructure consists of Types I & II nodular graphite as defined in ASTM A247. The matrix is ferrite with approximately 5-25% pearlite. The "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.

Chemical Composition of Ferritic Ductile Iron
C% Si% Mn% S% P%
3.50-3.90 2.25-3.00 0.15-0.35 0.025 max 0.05 max

Typical Uses

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

Grade Properties of Ferritic Ductile Iron

Tensile Strength (psi) 65,000
Yield Strength (psi) 45,000
Elongation (%) 12
Machinabilty Rating (1212=100%) 150%
Hardness (BHN) (AVG) 180
Relative Wear Resistance Fair
Heat-Treat Response (Rc) 55-60
Speed (sfm)
Feed (ipr) Depth of
Cut (inches)
Rough Turn (OD & ID) 800 - 1,200 0.014 - 0.028 0.100 - 0.175
Finish Turn (OD & ID) 1,600 - 2,000 0.004 - 0.020 0.010 - 0.050
Drilling/Milling (indexable) 475 - 825 0.004 - 0.012  
(solid carbide)
320 - 400 0.003 - 0.012  
Grooving (OD & ID) 900 - 1,500 0.002 - 0.007