Dura-Bar G2 Gray Iron
Chemical Composition
Carbon 2.60 - 3.75
Silicon 1.80 - 3.00
Manganese 0.60 - 0.95
Sulfur 0.07 max
Phosphorus 0.12


Typical Uses
Fluid Power: Cylinder Blocks, Glands, Manifolds, Pistons, Spools, Valves.
Machinery: Bushings, Gears, Gibs, Pulleys, Rams, Sheaves,
Side Frames, Slides, Ways, Spindles, Housings.
Transportation: Cylinder Liners, Gears, Lash Adjusters, Shock Absorber
Pistons, Valve Guides, Valve Seat Inserts, Brake Rotors.
Pump and
Compressor: Liners, Pistons, Rollers, Rotors, Seals.
Oil and Gas: Bridge Plugs, Cement Plugs, Cones, Mandrels, Retainers,
Miscellaneous: Aluminum Mold Plates, Bushings, Cams, Chain Sheaves,
Core Boxes, Dies, Gears, Pattern Plates, Pulleys, Wheels

Dura-Bar G2 Gray Iron is a "pearlitic gray iron" that contains Type A graphite. Dura-Bar G2 is made through a continuous cast process. It is built around the ASTM A48 Class 40 gray iron which is validated from a separately cast bar. Gray iron bars made to this specification will 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.
It is part of the Dura-Bar family of engineered cast iron bar products which are all designed to offer the best combination of machinability, sliding wear resistance, heat treat response, noise and vibration damping and guaranteed mechanical properties when compared to most other as-rolled ferrous materials. Dura-Bar can often be used to replace castings, some carbon steels, bearing bronze at times and extruded aluminum materials. Due to its outstanding milling and drilling characteristics, heavily machined components are usually excellent candidates for Dura-Bar products to help reduce manufacturing costs. A full range of metallurgical, engineering, heat treating, and machining data can be provided from Alro product specialists upon request.

Cast Irons are not typically referenced by chemistry rather mechanical properties, specifically strength and hardness. The primary difference in these types is the shape and distribution of graphite in their microstructure. Dura-Bar offers a zero-defect guarantee plus the inherent benefits of cast iron such as Improved machinability, Lower Tool Cost, Decreased Downtime For Tooling Changes, Reduced Scrap By Using Defect-Free Material.