Sep 27 2012
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication and Heat Treatment
Machinability
Welding
Introduction
Pure copper has good electrical and thermal conductivity. More than
400 varieties of copper alloys are available. Copper forms alloys more
freely than most metals.
The following datasheet gives an overview of UNS C82500 copper
casting alloy.
Chemical Composition
The chemical composition of UNS C82500 copper alloy is given in the
following table.
| Element |
Content
(%) |
| Copper, Cu |
97.25 |
| Beryllium, Be |
2 |
| Cobalt, Co |
0.5 |
| Silicon, Si |
0.25 |
Physical Properties
The physical properties of the UNS C82500 copper alloy are tabulated
below.
| Properties |
Metric |
Imperial |
| Density |
8.26 g/cm3 |
0.298 lb/in3 |
Mechanical Properties
The mechanical properties of the UNS C82500 copper alloy are
outlined in the following table.
| Properties |
Metric |
Imperial |
| Hardness, Rockwell B |
81 |
81 |
| Tensile strength |
515 MPa |
74700 psi |
| Yield strength (@ 0.200)% |
275 MPa |
39900 psi |
| Elongation at break (in 50 mm) |
15% |
15% |
| Elastic modulus |
117 GPa |
17000 ksi |
| Compressive yield strength
(permanent set of 0.1%) |
1030-1200 MPa |
149000-174000 psi |
| Poisson’s ratio |
0.34 |
0.34 |
| Fatigue strength (@ 50,000,000
cycles, rotating beam) |
165 MPa |
23900 psi |
| Machinability (UNS C36000
(free-cutting brass) = 100) |
30 |
30 |
| Shear modulus |
50.0 GPa |
7250 ksi |
Thermal Properties
The following table shows thermal properties of UNS C82500 copper
alloy.
| Properties |
Metric |
Imperial |
| Thermal expansion co-efficient (@
20-200°C/68-392°F) |
17 µm/m°C |
9.44 µin/in°F |
| Thermal conductivity (@ 20°C/68°F) |
105 W/mK |
729 BTU in/hr.ft².°F |
Other Designations
Other designations that are equivalent to UNS C82500 copper alloy
include:
- AMS 4511
- ASTM B30
- ASTM B770
- AMS 4890
- MIL-C-11866
Fabrication and Heat Treatment
Machinability
The machinability rating of UNS C82500 copper alloy is 30.
Welding
UNS C82500 copper alloy can be welded using brazing, soldering,
coated metal arc welding, and gas shielded arc welding techniques.
Oxyacetylene welding technique is not suitable for welding this alloy.