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UNS C71500 (CW354H) Copper-Nickel

C71500 copper-nickel is a copper-nickel alloy formulated for primary forming into wrought products. CW354H is the EN numeric designation for this material. C71500 is the UNS number. Additionally, the EN chemical designation is CuNi30Mn1Fe. The British Standard (BS) designation is CN107. And the common industry name is Cupronickel 30. Older literature may refer to this material as ASTM Copper-Nickel Type 5, but this is now discouraged.

It has a moderately high base cost among wrought copper-nickels. In addition, it has a moderately low electrical conductivity and a moderately high melting temperature.

The properties of C71500 copper-nickel include nine common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare C71500 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


Rockwell B Hardness

40 to 89

Shear Modulus

52 GPa 7.5 x 106 psi

Tensile Strength: Ultimate (UTS)

380 to 620 MPa 55 to 89 x 103 psi

Thermal Properties

Latent Heat of Fusion

230 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

16 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

4.6 % IACS

Electrical Conductivity: Equal Weight (Specific)

4.7 % IACS

Otherwise Unclassified Properties

Base Metal Price

41 % relative

Calomel Potential

-250 mV


8.9 g/cm3 560 lb/ft3

Embodied Carbon

5.1 kg CO2/kg material

Embodied Energy

74 MJ/kg 32 x 103 BTU/lb

Embodied Water

280 L/kg 34 gal/lb

Common Calculations

Stiffness to Weight: Axial

8.6 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

12 to 19 points

Strength to Weight: Bending

13 to 18 points

Thermal Diffusivity

7.7 mm2/s

Thermal Shock Resistance

12 to 20 points

Alloy Composition

Among wrought copper alloys, the composition of C71500 copper-nickel is notable for including manganese (Mn) and nickel (Ni). Manganese is used to improve strength without a proportional reduction in ductility. Nickel is used to improve strength (particularly at elevated temperatures) and corrosion resistance.

Copper (Cu)Cu 63.5 to 70.6
Nickel (Ni)Ni 29 to 33
Iron (Fe)Fe 0.4 to 1.0
Manganese (Mn)Mn 0 to 1.0
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

Similar Alloys

Further Reading

ASTM B151: Standard Specification for Copper-Nickel-Zinc Alloy (Nickel Silver) and Copper-Nickel Rod and Bar

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

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

Copper: Its Trade, Manufacture, Use, and Environmental Status, Gunter Joseph, 2001

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