Sep 27 2012
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Fabrication and Heat Treatment
Machinability
Welding
Heat Treatment
Introduction
Pure copper has good electrical and thermal conductivity. More than
400 varieties of copper alloys are available. Alloys can be freely
formed by copper than most metals.
The following datasheet gives an overview of UNS C82000 copper alloy.
Chemical Composition
The chemical composition UNS C82000 copper alloy is outlined in the
following table.
| Element |
Content
(%) |
| Copper, Cu |
96.8 |
| Beryllium, Be |
0.6 |
| Copper, Co |
2.6 |
Physical Properties
The physical properties of UNS C82000 copper alloy are tabulated
below.
| Properties |
Metric |
Imperial |
| Density |
8.62 g/cm3 |
0.311 lb/in3 |
Mechanical Properties
The following table shows mechanical properties of UNS C82000 copper
alloy.
| Properties |
Metric |
Imperial |
| Hardness, Rockwell B |
52 |
52 |
| Tensile strength |
345 MPa |
50000 psi |
| Yield strength (@ 0.200%) |
140 MPa |
20300 psi |
| Elongation at break |
20% |
20% |
| Elastic modulus |
117 GPa |
17000 ksi |
| Poisson’s ratio |
0.34 |
0.34 |
| Fatigue strength ( @ 5,000,000
cycles, rotating beam) |
125 MPa |
18100 psi |
| Machinability (UNS C36000
(free-cutting brass) = 100) |
30 |
30 |
| Shear modulus |
44 GPa |
6380 ksi |
Thermal Properties
The thermal properties of the UNS C82000 copper alloy are tabulated
below.
| Properties |
Metric |
Imperial |
| Thermal expansion co-efficient
(@20-300°C/68-572°F) |
17.8 µm/m°C |
9.89 µin/in°F |
| Thermal conductivity (@20°C/68°F) |
218 W/mK |
1510 BTU in/hr.ft².°F |
Fabrication and Heat Treatment
Machinability
The machinability rating of UNS C82000 copper alloy is 20.
Welding
UNS C82000 copper alloy can be welded using brazing, soldering,
carbon arc welding, coated metal arc welding, and gas shielded arc
welding techniques. Oxyacetylene welding technique is not suitable for
welding this alloys.
Heat Treatment
UNS C82000 copper alloy can be stress relieved at a temperature of
about 280°C (500°F). The time taken for stress relieving is about 1
hr/in. of section thickness. Heat treating temperatures of this alloy
are between 900 and 927°C (1650 and 1700°F). However, it does not
respond to heat treatment. The time taken for heat treating is also
about 1 hr/in. of section thickness. Water is used as a quenching
medium. Precipitation hardening temperature of this alloy is about
450°C (850°F), and the time taken for precipitation hardening is about
3 h. Air is a quenching medium used in precipitation hardening process.