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UNS C96900 Copper-Nickel

C96900 copper-nickel is a copper-nickel alloy formulated for casting. Cited properties are appropriate for the heat treated (HT) condition. It has a moderately low heat capacity among cast copper-nickels. In addition, it has a fairly low ductility and a fairly high tensile strength.

The graph bars on the material properties cards below compare C96900 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

120 GPa 18 x 106 psi

Elongation at Break

4.5 %

Poisson's Ratio

0.34

Shear Modulus

45 GPa 6.6 x 106 psi

Tensile Strength: Ultimate (UTS)

850 MPa 120 x 103 psi

Tensile Strength: Yield (Proof)

830 MPa 120 x 103 psi

Thermal Properties

Latent Heat of Fusion

210 J/g

Maximum Temperature: Mechanical

210 °C 400 °F

Melting Completion (Liquidus)

1060 °C 1950 °F

Melting Onset (Solidus)

960 °C 1760 °F

Specific Heat Capacity

380 J/kg-K 0.091 BTU/lb-°F

Thermal Expansion

17 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

9.0 % IACS

Electrical Conductivity: Equal Weight (Specific)

9.2 % IACS

Otherwise Unclassified Properties

Base Metal Price

39 % relative

Density

8.8 g/cm3 550 lb/ft3

Embodied Carbon

4.6 kg CO2/kg material

Embodied Energy

72 MJ/kg 31 x 103 BTU/lb

Embodied Water

360 L/kg 43 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

38 MJ/m3

Resilience: Unit (Modulus of Resilience)

2820 kJ/m3

Stiffness to Weight: Axial

7.7 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

27 points

Strength to Weight: Bending

23 points

Thermal Shock Resistance

30 points

Alloy Composition

Among cast copper alloys, the composition of C96900 copper-nickel is notable for containing comparatively high amounts of nickel (Ni) and tin (Sn). Nickel is used to improve strength (particularly at elevated temperatures) and corrosion resistance. It also creates the need for additional care during casting. Tin is used to improve strength, bearing properties, and corrosion resistance against certain types of media. It also places certain constraints on cast part design, so as to avoid porosity problems.

Copper (Cu) 73.6 to 78
Nickel (Ni) 14.5 to 15.5
Tin (Sn) 7.5 to 8.5
Iron (Fe) 0 to 0.5
Zinc (Zn) 0 to 0.5
Manganese (Mn) 0.050 to 0.3
Silicon (Si) 0 to 0.3
Magnesium (Mg) 0 to 0.15
Niobium (Nb) 0 to 0.1
Lead (Pb) 0 to 0.020
Residuals 0 to 0.5

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

Followup Questions

Similar Alloys

Further Reading

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