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UNS C99300 Nickel-Aluminum Copper

C99300 copper is a copper-nickel alloy formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. It has the lowest ductility among cast copper-nickels. In addition, it has a moderately low base cost and a moderately high tensile strength.

The graph bars on the material properties cards below compare C99300 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

Brinell Hardness

200

Elastic (Young's, Tensile) Modulus

120 GPa 18 x 106 psi

Elongation at Break

2.0 %

Poisson's Ratio

0.33

Shear Modulus

46 GPa 6.7 x 106 psi

Tensile Strength: Ultimate (UTS)

660 MPa 95 x 103 psi

Tensile Strength: Yield (Proof)

380 MPa 55 x 103 psi

Thermal Properties

Latent Heat of Fusion

240 J/g

Maximum Temperature: Mechanical

250 °C 480 °F

Melting Completion (Liquidus)

1080 °C 1970 °F

Melting Onset (Solidus)

1070 °C 1950 °F

Specific Heat Capacity

450 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

43 W/m-K 25 BTU/h-ft-°F

Thermal Expansion

17 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

9.0 % IACS

Electrical Conductivity: Equal Weight (Specific)

9.8 % IACS

Otherwise Unclassified Properties

Base Metal Price

35 % relative

Density

8.2 g/cm3 510 lb/ft3

Embodied Carbon

4.5 kg CO2/kg material

Embodied Energy

70 MJ/kg 30 x 103 BTU/lb

Embodied Water

400 L/kg 48 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

11 MJ/m3

Resilience: Unit (Modulus of Resilience)

590 kJ/m3

Stiffness to Weight: Axial

8.3 points

Stiffness to Weight: Bending

20 points

Strength to Weight: Axial

22 points

Strength to Weight: Bending

20 points

Thermal Diffusivity

12 mm2/s

Thermal Shock Resistance

22 points

Alloy Composition

Among cast copper alloys, the composition of C99300 copper is notable for including cobalt (Co) and containing a comparatively high amount of aluminum (Al). Cobalt is used to improve strength. Aluminum is used to add strength and oxidation resistance, at the cost of requiring additional care during casting.

Copper (Cu) 68.6 to 74.4
Nickel (Ni) 13.5 to 16.5
Aluminum (Al) 10.7 to 11.5
Cobalt (Co) 1.0 to 2.0
Iron (Fe) 0.4 to 1.0
Tin (Sn) 0 to 0.050
Silicon (Si) 0 to 0.020
Lead (Pb) 0 to 0.020
Residuals 0 to 0.3

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