UNS C82400 (Alloy 165C) Beryllium Copper
C82400 copper is a lightly alloyed grade of copper, formulated for casting. C82400 is the UNS number for this material. Older literature may refer to this material as ASTM Alloy 165C or ASTM Alloy 165CT.
It has a fairly low thermal conductivity among cast coppers. In addition, it has a fairly low electrical conductivity and a fairly low melting temperature.
The properties of C82400 copper include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare C82400 copper to: cast coppers (top), all copper alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Elastic (Young's, Tensile) Modulus
120 GPa 17 x 106 psi
Elongation at Break
1.0 to 20 %
Poisson's Ratio
0.33
Shear Modulus
45 GPa 6.5 x 106 psi
Tensile Strength: Ultimate (UTS)
500 to 1030 MPa 72 to 150 x 103 psi
Tensile Strength: Yield (Proof)
260 to 970 MPa 37 to 140 x 103 psi
Thermal Properties
Latent Heat of Fusion
230 J/g
Maximum Temperature: Mechanical
270 °C 520 °F
Melting Completion (Liquidus)
1000 °C 1820 °F
Melting Onset (Solidus)
900 °C 1650 °F
Specific Heat Capacity
380 J/kg-K 0.092 BTU/lb-°F
Thermal Conductivity
130 W/m-K 77 BTU/h-ft-°F
Thermal Expansion
17 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
25 % IACS
Electrical Conductivity: Equal Weight (Specific)
26 % IACS
Otherwise Unclassified Properties
Density
8.8 g/cm3 550 lb/ft3
Embodied Carbon
8.9 kg CO2/kg material
Embodied Energy
140 MJ/kg 60 x 103 BTU/lb
Embodied Water
310 L/kg 37 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
10 to 83 MJ/m3
Resilience: Unit (Modulus of Resilience)
270 to 3870 kJ/m3
Stiffness to Weight: Axial
7.6 points
Stiffness to Weight: Bending
19 points
Strength to Weight: Axial
16 to 33 points
Strength to Weight: Bending
16 to 26 points
Thermal Diffusivity
39 mm2/s
Thermal Shock Resistance
17 to 36 points
Alloy Composition
Among cast copper alloys, the composition of C82400 copper is notable for including cobalt (Co) and beryllium (Be). Cobalt is used to improve strength. Beryllium is used to permit precipitation hardening (which increases strength) without much effect on electrical conductivity, but at the cost of substantial toxicity.
| Cu | 96 to 98.2 | |
| Be | 1.6 to 1.9 | |
| Co | 0.2 to 0.65 | |
| Ni | 0 to 0.2 | |
| Fe | 0 to 0.2 | |
| Al | 0 to 0.15 | |
| Ti | 0 to 0.12 | |
| Cr | 0 to 0.1 | |
| Sn | 0 to 0.1 | |
| Zn | 0 to 0.1 | |
| Pb | 0 to 0.020 | |
| res. | 0 to 0.5 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ASM Specialty Handbook: Copper and Copper Alloys, J. R. Davis (editor), 2001