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UNS C96400 Copper-Nickel

C96400 copper-nickel is a copper-nickel alloy formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. C96400 is the UNS number for this material. Additionally, the common industry name is Cast 70-30 Copper-Nickel. Older literature may refer to this material as ASTM Copper-Nickel Type B, but this is now discouraged.

It has a fairly high ductility among cast copper-nickels. In addition, it has a fairly high base cost and a moderately low electrical conductivity.

The graph bars on the material properties cards below compare C96400 copper-nickel 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

25 %

Poisson's Ratio

0.33

Shear Modulus

51 GPa 7.5 x 106 psi

Tensile Strength: Ultimate (UTS)

490 MPa 71 x 103 psi

Tensile Strength: Yield (Proof)

260 MPa 38 x 103 psi

Thermal Properties

Latent Heat of Fusion

240 J/g

Maximum Temperature: Mechanical

260 °C 500 °F

Melting Completion (Liquidus)

1240 °C 2260 °F

Melting Onset (Solidus)

1170 °C 2140 °F

Specific Heat Capacity

400 J/kg-K 0.1 BTU/lb-°F

Thermal Conductivity

28 W/m-K 16 BTU/h-ft-°F

Thermal Expansion

15 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

5.0 % IACS

Electrical Conductivity: Equal Weight (Specific)

5.1 % IACS

Otherwise Unclassified Properties

Base Metal Price

45 % relative

Density

8.9 g/cm3 550 lb/ft3

Embodied Carbon

5.9 kg CO2/kg material

Embodied Energy

87 MJ/kg 37 x 103 BTU/lb

Embodied Water

280 L/kg 33 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

100 MJ/m3

Resilience: Unit (Modulus of Resilience)

250 kJ/m3

Stiffness to Weight: Axial

8.6 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

15 points

Strength to Weight: Bending

16 points

Thermal Diffusivity

7.8 mm2/s

Thermal Shock Resistance

17 points

Alloy Composition

Among cast copper alloys, the composition of C96400 copper-nickel is notable for containing a comparatively high amount of nickel (Ni). 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) 62.3 to 71.3
Nickel (Ni) 28 to 32
Niobium (Nb) 0.5 to 1.5
Iron (Fe) 0.25 to 1.5
Manganese (Mn) 0 to 1.5
Silicon (Si) 0 to 0.5
Carbon (C) 0 to 0.15
Phosphorus (P) 0 to 0.020
Sulfur (S) 0 to 0.020
Lead (Pb) 0 to 0.010
Residuals 0 to 0.5

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

Followup Questions

Similar Alloys

Further Reading

ASTM B369: Standard Specification for Copper-Nickel Alloy Castings

ASTM B505: Standard Specification for Copper Alloy Continuous Castings

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