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Dura Bar Metal Services
Dura-Bar grade G2 offered by Dura-Bar Metal Services #

Highly Pearlitic Gray Iron G2

Dura-Bar G2 is a pearlitic gray iron containing Type A graphite. Gray Iron bars made to this specification have optimal strength, wear and hardness when compared to the other gray iron grades. This material is well suited for applications requiring high resistance to wear and response to heat treatment. This specification conforms to ASTM A48 class 40.

Microstructure

Depiction of Dura-Bar microstructure

CENTER AREA
100x, etched in 5% Nitol Center view of Dura-Bar G2 microstructure

EDGE AREA
100x, etched in 5% Nitol Edge view of Dura-Bar G2 microstructure

The microstructure will contain Type VII, A, size 4-6 graphite as defined in ASTM A247. The matrix is fully pearlitic. The rim will consist of Type D, size 4-6 graphite in a pearlite matrix with small amounts of ferrite. Chill carbides will be less than 5% in any field at 100x and are well dispersed.

Chemical Composition
C% Si% Mn% S% P%
2.60-3.75 1.80-3.00 0.60-0.95 0.07 max 0.12 max

Typical Uses

Automotive:
Gears
Fluid Power:
Cylinder blocks, Glands, Manifolds, Pistons, Rotors, Spools, Valves
Machinery:
Bushings, Gears, Gibs, Housings, Pulleys, Rams, Sheaves, Side Frames, Slides, Spindles, Ways
Miscellaneous:
Aluminum Molds Plates, Cams, Chain Sheaves, Core Boxes, Dies, Pattern Plates, Wheels
Oil and Gas:
Bridge Plugs, Cement Plugs, Cones, Mandrels, Retainers, Slips
Power Transmission:
Gears, Pulleys
Pump and Compressor:
Gears, Housings, Liners, Pistons, Rollers, Rotors, Seals
Steel Mill:
Continuous Caster Rolls, Foot Rolls, Table Rolls, Torch Rolls
Transportation:
Brake Rotors, Cylinder Liners, Gears, Lash Adjusters, Pulleys, Shock Absorber Pistons, Valve Guides, Valve Seat Inserts

Grade Properties

Mechanical: G2
Tensile Strength, psi 40,000
Yield Strength (psi) N/A
Elongation (%) N/A
Machinability Rating (1212=100%) 135%
Hardness (BHN) (AVG) 241
Relative Wear Resistance Excellent
Heat-Treat Response (Rc) 55-60

 

Machining Guidelines: G2
Machining Operation Maching Speed (sfm) Feed (ipr) Depth of Cut (inches)
Rough Turn (OD & ID) 800 - 1,000 0.014 - 0.028 0.100 - 0.175
Finish Turn (OD & ID) 1,400 - 1,800 0.004 - 0.020 0.010 - 0.050
Drilling/Milling (indexable) 410 - 700 0.004 - 0.015  
Drilling/Milling (solid carbide) 270 - 650 0.003 - 0.012  
Grooving (OD & ID) 400- 650 0.002 - 0.007