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Dura-Bar grade 80-55-06 offered by Dura-Bar Metal Services #

Ductile Iron 80-55-06

Dura-Bar 80-55-06 ductile iron contains 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 AISI1040 steel in the as-rolled condition. This specification is similar to ASTM A536 grade 80-55-06.


Depiction of Dura-Bar microstructure

100x, etched in 5% Nitol Center view of Dura-Bar 80-55-06 microstructure

100x, etched in 5% Nitol Edge view of Dura-Bar 80-55-06 microstructure

The microstructure consists of Type I & Type II nodular graphite as defined in ASTM A247. The matrix is pearlite and ferrite. The "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.

a536 Graphite Cast Iron Chemical Composition
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, 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

Grade Properties Partially Pearlitic Ductile Iron

Tensile Strength (psi) 80,000
Yield Strength (psi) 55,000
Elongation (%) 6
Machinabilty Rating (1212=100%) 125%
Hardness (BHN) (AVG) 229
Relative Wear Resistance Good
Heat-Treat Response (Rc) 55-60
Speed (sfm)
Feed (ipr) Depth of
Cut (inches)
Rough Turn (OD & ID) 700 - 900 0.008 - 0.024 0.100 - 0.175
Finish Turn (OD & ID) 1,000 - 1,500 0.004 - 0.020 0.010 - 0.050
Drilling/Milling (indexable) 410 - 650 0.004 - 0.015  
(solid carbide)
270 - 350 0.003 - 0.012  
Grooving (OD & ID) 500 - 900 0.002 - 0.007