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UNS C96600 Nickel-Beryllium Copper

C96600 copper is a copper-nickel alloy formulated for casting. Cited properties are appropriate for the heat treated (HT) condition. It has a fairly low electrical conductivity among cast copper-nickels. In addition, it has a fairly high base cost and a fairly high embodied energy.

The graph bars on the material properties cards below compare C96600 copper to: cast copper-nickels (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

140 GPa 20 x 106 psi

Elongation at Break

7.0 %

Poisson's Ratio


Shear Modulus

52 GPa 7.6 x 106 psi

Tensile Strength: Ultimate (UTS)

760 MPa 110 x 103 psi

Tensile Strength: Yield (Proof)

480 MPa 70 x 103 psi

Thermal Properties

Latent Heat of Fusion

240 J/g

Maximum Temperature: Mechanical

280 °C 540 °F

Melting Completion (Liquidus)

1180 °C 2160 °F

Melting Onset (Solidus)

1100 °C 2010 °F

Specific Heat Capacity

400 J/kg-K 0.1 BTU/lb-°F

Thermal Conductivity

30 W/m-K 17 BTU/h-ft-°F

Thermal Expansion

15 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

4.0 % IACS

Electrical Conductivity: Equal Weight (Specific)

4.1 % IACS

Otherwise Unclassified Properties

Base Metal Price

65 % relative


8.9 g/cm3 550 lb/ft3

Embodied Carbon

7.0 kg CO2/kg material

Embodied Energy

100 MJ/kg 45 x 103 BTU/lb

Embodied Water

280 L/kg 34 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

47 MJ/m3

Resilience: Unit (Modulus of Resilience)

830 kJ/m3

Stiffness to Weight: Axial

8.7 points

Stiffness to Weight: Bending

20 points

Strength to Weight: Axial

24 points

Strength to Weight: Bending

21 points

Thermal Diffusivity

8.4 mm2/s

Thermal Shock Resistance

25 points

Alloy Composition

Among cast copper alloys, the composition of C96600 copper is notable for including beryllium (Be) and containing a comparatively high amount of nickel (Ni). Beryllium is used to permit precipitation hardening (which increases strength) without much effect on electrical conductivity, but at the cost of substantial toxicity. Nickel is used to improve strength (particularly at elevated temperatures) and corrosion resistance. It also creates the need for additional care during casting.

Copper (Cu)Cu 63.5 to 69.8
Nickel (Ni)Ni 29 to 33
Iron (Fe)Fe 0.8 to 1.1
Beryllium (Be)Be 0.4 to 0.7
Manganese (Mn)Mn 0 to 1.0
Silicon (Si)Si 0 to 0.15
Lead (Pb)Pb 0 to 0.010
Residualsres. 0 to 0.5

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993