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Extra-Hard (H06) C71000 Copper-Nickel

H06 C71000 copper-nickel is C71000 copper-nickel in the H06 (extra hard) temper. It has the second highest strength compared to the other variants of C71000 copper-nickel. The graph bars on the material properties cards below compare H06 C71000 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

130 GPa 19 x 106 psi

Poisson's Ratio


Rockwell B Hardness


Rockwell Superficial 30T Hardness


Shear Modulus

49 GPa 7.1 x 106 psi

Tensile Strength: Ultimate (UTS)

540 MPa 78 x 103 psi

Thermal Properties

Latent Heat of Fusion

230 J/g

Maximum Temperature: Mechanical

240 °C 460 °F

Melting Completion (Liquidus)

1200 °C 2190 °F

Melting Onset (Solidus)

1150 °C 2100 °F

Specific Heat Capacity

400 J/kg-K 0.1 BTU/lb-°F

Thermal Conductivity

43 W/m-K 25 BTU/h-ft-°F

Thermal Expansion

15 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

6.5 % IACS

Electrical Conductivity: Equal Weight (Specific)

6.6 % IACS

Otherwise Unclassified Properties

Base Metal Price

37 % relative


8.9 g/cm3 560 lb/ft3

Embodied Carbon

4.3 kg CO2/kg material

Embodied Energy

63 MJ/kg 27 x 103 BTU/lb

Embodied Water

290 L/kg 35 gal/lb

Common Calculations

Stiffness to Weight: Axial

8.2 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

17 points

Strength to Weight: Bending

17 points

Thermal Diffusivity

12 mm2/s

Thermal Shock Resistance

20 points

Alloy Composition

Copper (Cu) 73.5 to 80.5
Nickel (Ni) 19 to 23
Iron (Fe) 0.5 to 1.0
Manganese (Mn) 0 to 1.0
Zinc (Zn) 0 to 1.0
Lead (Pb) 0 to 0.050
Residuals 0 to 0.5

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

Followup Questions

Further Reading

ASTM B122: Standard Specification for Copper-Nickel-Tin Alloy, Copper-Nickel-Zinc Alloy (Nickel Silver), and Copper-Nickel Alloy Plate, Sheet, Strip, and Rolled Bar

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