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Performance Alloys®

 

 

...World Wide Distributor of Beryllium-Free Copper Alloys...
    Manufacturer of Standard & Custom Components

mold making components, molders, alloys

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mold making components, molders, alloys

MoldStar®21
Continuous Cast Aluminum Bronze Rod & Bar

(see MoldStar®22 for Extruded Bronze Product)
Description

A continuous cast (UNS-C95900) aluminum-iron-copper alloy recommended for heavier-duty applications involving compressive wear and high abrasion, especially where no impact is present.

Uses include: die rings, forming rolls, inserts, wiping blocks, cam followers, pilot bushings, dies and drill jig bushings. Also, offers proven performance in plastic mold applications - ejector sleeves and bushings, guide pin and leader pin bushings, wear plates, gibs.

MoldStar®21 alloy will maintain mechanical properties at temperatures up to 6000F and has a machinability rating of 20%. The alloy provides corrosion resistance to non-oxidizing mineral acids. Can be welded with both gas-shielded and shielded metal-arc processes. Brazing, soldering and oxyfuel gas welding are not recommended.

Cold working is not recommended. Hot formability is good with a forgeability rating of 75%. MoldStar®21 alloy can be hot worked at temperatures from 13750 to 15500F and annealed between 11000 and 12000F.

The consistent superiority of MoldStar®21 alloy over commercial bronze is due, in large part, to the unique distribution of the alloy microstructure.

Chemistry

Copper 83%
Aluminum 13%
Iron 4%

Specifications

CDA C62500, C95900

Mechanical Properties
(based on 1" test bars)

Tensile Strength (ksi) 110+
Yield Strength (ksi) 60+
Elongation, % in 2" .1+
Hardness- Rockwell C 29
Ultimate in Compression (ksi) 175
Proportional Limit (ksi)  34+
Impact - Charpy Keyhole (ft-lbs) 2
               Izod (ft-lbs)  2
Modulus of Elasticity (tension), (ksi) 15,000
Poissan's Ratio .312

*Properties are shown for comparative information only

Physical Properties*

Density   (lbs/in3) .260
Specific Gravity 7.21
Specific Heat
(Btu/lb 0F)		 .09
Coefficient of Thermal Expansion
(in/in/0F)		 9.0 x 10-6
Electrical Conductivity
(% IACS)		 10
Electrical Resistivity  (Microhms-Meter @ 680F)  172
Thermal Conductivity
(Btu/sq. ft./ft./hr./0F @ 680F)		 22.5
Magnetic Permeability 1

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Disclaimer

While the information contained is deemed reliable, no warranties are expressed or implied. For specific information regarding an application please call 1-800-272-3031 or e-mail us at sales@moldstar.com

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