UNS C82000 (Alloy 10C) Cobalt-Beryllium Copper
C82000 copper is a lightly alloyed grade of copper, formulated for casting. C82000 is the UNS number for this material. Older literature may refer to this material as ASTM Alloy 10C, but this is now discouraged.
It has the highest base cost among cast coppers. In addition, it has a moderately low electrical conductivity and a fairly low melting temperature.
The properties of C82000 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 C82000 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
8.0 to 20 %
Poisson's Ratio
0.34
Rockwell B Hardness
55 to 95
Shear Modulus
45 GPa 6.5 x 106 psi
Tensile Strength: Ultimate (UTS)
350 to 690 MPa 50 to 100 x 103 psi
Tensile Strength: Yield (Proof)
140 to 520 MPa 20 to 75 x 103 psi
Thermal Properties
Latent Heat of Fusion
220 J/g
Maximum Temperature: Mechanical
220 °C 440 °F
Melting Completion (Liquidus)
1090 °C 1990 °F
Melting Onset (Solidus)
970 °C 1780 °F
Specific Heat Capacity
390 J/kg-K 0.092 BTU/lb-°F
Thermal Conductivity
260 W/m-K 150 BTU/h-ft-°F
Thermal Expansion
17 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
45 % IACS
Electrical Conductivity: Equal Weight (Specific)
46 % IACS
Otherwise Unclassified Properties
Base Metal Price
60 % relative
Density
8.9 g/cm3 550 lb/ft3
Embodied Carbon
5.0 kg CO2/kg material
Embodied Energy
77 MJ/kg 33 x 103 BTU/lb
Embodied Water
320 L/kg 38 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
51 to 55 MJ/m3
Resilience: Unit (Modulus of Resilience)
80 to 1120 kJ/m3
Stiffness to Weight: Axial
7.5 points
Stiffness to Weight: Bending
18 points
Strength to Weight: Axial
11 to 22 points
Strength to Weight: Bending
12 to 20 points
Thermal Diffusivity
76 mm2/s
Thermal Shock Resistance
12 to 24 points
Alloy Composition
Among cast copper alloys, the composition of C82000 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 | 95.2 to 97.4 | |
| Co | 2.2 to 2.7 | |
| Be | 0.45 to 0.8 | |
| Ni | 0 to 0.2 | |
| Si | 0 to 0.15 | |
| Cr | 0 to 0.1 | |
| Fe | 0 to 0.1 | |
| Al | 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
CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015