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Annealed (O61) C71640 Copper-Nickel

O61 C71640 copper-nickel is C71640 copper-nickel in the O61 (annealed) temper. The graph bars on the material properties cards below compare O61 C71640 copper-nickel to: wrought 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

Poisson's Ratio

0.33

Shear Modulus

52 GPa 7.6 x 106 psi

Tensile Strength: Ultimate (UTS)

490 MPa 71 x 103 psi

Tensile Strength: Yield (Proof)

190 MPa 28 x 103 psi

Thermal Properties

Latent Heat of Fusion

240 J/g

Maximum Temperature: Mechanical

260 °C 500 °F

Melting Completion (Liquidus)

1180 °C 2160 °F

Melting Onset (Solidus)

1120 °C 2050 °F

Specific Heat Capacity

410 J/kg-K 0.1 BTU/lb-°F

Thermal Conductivity

29 W/m-K 17 BTU/h-ft-°F

Thermal Expansion

15 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

7.0 % IACS

Electrical Conductivity: Equal Weight (Specific)

7.1 % IACS

Otherwise Unclassified Properties

Base Metal Price

40 % relative

Density

8.9 g/cm3 550 lb/ft3

Embodied Carbon

5.0 kg CO2/kg material

Embodied Energy

73 MJ/kg 31 x 103 BTU/lb

Embodied Water

280 L/kg 33 gal/lb

Common Calculations

Resilience: Unit (Modulus of Resilience)

130 kJ/m3

Stiffness to Weight: Axial

8.7 points

Stiffness to Weight: Bending

20 points

Strength to Weight: Axial

15 points

Strength to Weight: Bending

16 points

Thermal Diffusivity

8.2 mm2/s

Thermal Shock Resistance

16 points

Alloy Composition

Copper (Cu)Cu 61.7 to 67.8
Nickel (Ni)Ni 29 to 32
Manganese (Mn)Mn 1.5 to 2.5
Iron (Fe)Fe 1.7 to 2.3
Zinc (Zn)Zn 0 to 1.0
Lead (Pb)Pb 0 to 0.050
Residualsres. 0 to 0.5

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

Followup Questions

Further Reading

ASTM B111: Standard Specification for Copper and Copper-Alloy Seamless Condenser Tubes and Ferrule Stock

ASM Specialty Handbook: Copper and Copper Alloys, J. R. Davis (editor), 2001