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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.

Copper (Cu) 97.4 to 98.7
Nickel (Ni) 1.0 to 2.0
Beryllium (Be) 0.35 to 0.8
Cobalt (Co) 0 to 0.3
Residuals 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