GX Gray

GX is a pearlitic gray iron offered in a variety of small and large cross sections for non-typical size applications.  GX is available in rounds as large as 26.56” diameter and up to 28” rectangles/squares (on longest dimension).  GX benefits include wear resistance, noise and vibration damping, and can be heat treated using conventional methods.

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Dura-Bar Gray Iron G2

Microstructure

The core microstructure will consist of Type A graphite flake, per ASTM A247, with a matrix containing a minimum of 90% pearlite. The edge or rim will have a combination of Type D and Type E graphite flake and a matrix with a mixture of ferrite and pearlite. The rim will contain as much as 5% carbides.

Center Area

100x, etched in 5% Nital

Edge Area

100x, etched in 5% Nital

Heat Treat Response

GX can be heat treated by conventional methods. Hardening can be accomplished by heating and quenching the material from 1600° F resulting in Rockwell C hardness up to 50 HRC. Induction and flame hardening can be performed but may require an additional pre-heat treatment to reach the desired hardness and microstructure.


Stock Sizes

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Rounds

As-cast round bars are made to clean up at the nominal size. Additional stock is added to allow for out-of-round and normal imperfections in the as-cast surface. Stock allowance is a function of the bar diameter - see Stock Allowances for details. Other finishes available are Centerless Grinding and Centerless Turning, for demanding tolerance applications.

Grade Shape Diameter (in) Surface Weight (lb/ft)
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Rectangles

As-cast rectangles are made to the actual size with no allowance for machine stock added. Rectangles are cast to actual dimension, with clean up stock dependent on the height and width ratio. See Stock Allowances for details. Rectangles can be milled to achieve close tolerance benefits - see Services/Milling for details.

Grade Shape Height (in) Width (in) Surface Weight (lb/ft)
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Squares

As-cast squares are made to the actual size with no allowance for machine stock added. Squares are cast to actual dimension, with clean up stock dependent on the height and width ratio. See Stock Allowances for details. Squares can be milled to achieve close tolerance benefits - see Services/Milling for details.

Grade Shape Height (in) Width (in) Surface Weight (lb/ft)

Custom Shapes

Sizes can be designed to meet your requirements.

All custom shapes are special order and are quoted individually at minimum run quantities. Contact us to find out if a Dura-Bar custom shape will work for your part.


Technical Specifications

Chemical Composition

Element Percentage
Carbon 2.95 - 3.45%
Silicon 2.10 - 2.90%
Manganese 0.50 - 0.98%
Sulfur 0.04 - 0.08%
Phosphorus 0.15% Max

Mechanical Properties

Hardness values listed are minimum and maximum across the bar. Hardness values for rectangles and squares are a function of the height and width ratios and will be supplied on request.

Size Range BHN
Inches mm Min Max
1.000 - 28.000 25 - 711 190 260

 

The tensile strength will be approximately 40,000 psi, as determined from a longitudinal test specimen taken from mid-radius of the as-cast bar. The tensile data is not a minimum, but rather the typical expected tensile strength. Anticipated tensile data for shapes, including squares and rectangles, will be provided on request.

Mechanical Properties
Tensile strength psi (min) 40,000
Yield strength psi (min) n/a*
Elongation (min) n/a*

* Gray iron will not yield/elongate before fracture. The behavior of gray iron is non-ductile.


Typical Applications

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/Foundry:

Continuous Caster Rolls, Pattern Plates, Core Box Patterns, Foot Rolls, Table Rolls, Torch Rolls

Transportation:

Brake Rotors, Cylinder Liners, Gears, Lash Adjusters, Pulleys, Shock Absorber Pistons, Valve Guides, Valve Seat Inserts

Dura-Bar®
1800 West Lake Shore Drive
Woodstock, IL 60098

815-338-7800

800-BAR-MILL (227-6455)

Fax: 815-338-1549 Sales

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