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 |
|