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
0.33
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
Density
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.
| Cu | 63.5 to 70.6 | |
| Ni | 29 to 33 | |
| Fe | 0.4 to 1.0 | |
| Mn | 0 to 1.0 | |
| Zn | 0 to 1.0 | |
| Pb | 0 to 0.050 | |
| res. | 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