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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.

Microstructure

Depiction of Dura-Bar microstructure

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

EDGE AREA
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

Automotive:
Gears
Fluid Power:
Cylinder blocks, Gerotors, Glands, Manifolds, Pistons, Rotors, Valves
Machinery:
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
Miscellaneous:
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
Transportation:
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
Machining
Operation
Machining
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  
Drilling/Milling
(solid carbide)
270 - 350 0.003 - 0.012  
Grooving (OD & ID) 500 - 900 0.002 - 0.007