UNS C82200 (Alloy 14C) Nickel-Beryllium Copper
C82200 copper is a lightly alloyed grade of copper, formulated for casting. C82200 is the UNS number for this material. Older literature may refer to this material as ASTM Alloy 14C, but this is now discouraged.
It has a moderately high base cost among cast coppers. In addition, it has a moderately low electrical conductivity and a fairly low thermal conductivity.
The properties of C82200 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 C82200 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
60 to 96
Shear Modulus
44 GPa 6.4 x 106 psi
Tensile Strength: Ultimate (UTS)
390 to 660 MPa 57 to 95 x 103 psi
Tensile Strength: Yield (Proof)
210 to 520 MPa 30 to 75 x 103 psi
Thermal Properties
Latent Heat of Fusion
220 J/g
Maximum Temperature: Mechanical
230 °C 440 °F
Melting Completion (Liquidus)
1080 °C 1970 °F
Melting Onset (Solidus)
1040 °C 1900 °F
Specific Heat Capacity
390 J/kg-K 0.092 BTU/lb-°F
Thermal Conductivity
180 W/m-K 110 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
55 % relative
Density
8.9 g/cm3 560 lb/ft3
Embodied Carbon
4.8 kg CO2/kg material
Embodied Energy
74 MJ/kg 32 x 103 BTU/lb
Embodied Water
310 L/kg 37 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
49 to 66 MJ/m3
Resilience: Unit (Modulus of Resilience)
180 to 1130 kJ/m3
Stiffness to Weight: Axial
7.4 points
Stiffness to Weight: Bending
18 points
Strength to Weight: Axial
12 to 20 points
Strength to Weight: Bending
13 to 19 points
Thermal Diffusivity
53 mm2/s
Thermal Shock Resistance
14 to 23 points
Alloy Composition
Among cast copper alloys, the composition of C82200 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 | 97.4 to 98.7 | |
| Ni | 1.0 to 2.0 | |
| Be | 0.35 to 0.8 | |
| Co | 0 to 0.3 | |
| 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