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
CENTER AREA
100x, etched in 5% Nitol 
EDGE AREA
100x, etched in 5% Nitol 
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.
| 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 |