UNS C75700 (CW403J) Nickel Silver
C75700 nickel silver is a copper-nickel alloy formulated for primary forming into wrought products. CW403J is the EN numeric designation for this material. C75700 is the UNS number. Additionally, the EN chemical designation is CuNi12Zn24. The British Standard (BS) designation is NS104. And the common industry name is 65-12 Nickel Silver.
It can have a moderately high tensile strength among the wrought copper-nickels in the database.
The properties of C75700 nickel silver include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare C75700 nickel silver 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
120 GPa 17 x 106 psi
Elongation at Break
3.2 to 22 %
Poisson's Ratio
0.32
Shear Modulus
45 GPa 6.5 x 106 psi
Shear Strength
350 to 370 MPa 51 to 53 x 103 psi
Tensile Strength: Ultimate (UTS)
590 to 610 MPa 85 to 88 x 103 psi
Tensile Strength: Yield (Proof)
470 to 580 MPa 68 to 84 x 103 psi
Thermal Properties
Latent Heat of Fusion
200 J/g
Maximum Temperature: Mechanical
180 °C 350 °F
Melting Completion (Liquidus)
1040 °C 1900 °F
Melting Onset (Solidus)
990 °C 1810 °F
Specific Heat Capacity
390 J/kg-K 0.094 BTU/lb-°F
Thermal Conductivity
40 W/m-K 23 BTU/h-ft-°F
Thermal Expansion
16 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
8.0 % IACS
Electrical Conductivity: Equal Weight (Specific)
8.6 % IACS
Otherwise Unclassified Properties
Base Metal Price
30 % relative
Density
8.4 g/cm3 520 lb/ft3
Embodied Carbon
3.6 kg CO2/kg material
Embodied Energy
56 MJ/kg 24 x 103 BTU/lb
Embodied Water
310 L/kg 37 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
19 to 120 MJ/m3
Resilience: Unit (Modulus of Resilience)
930 to 1410 kJ/m3
Stiffness to Weight: Axial
7.8 points
Stiffness to Weight: Bending
19 points
Strength to Weight: Axial
19 to 20 points
Strength to Weight: Bending
19 points
Thermal Diffusivity
12 mm2/s
Thermal Shock Resistance
22 to 23 points
Alloy Composition
Among wrought copper alloys, the composition of C75700 nickel silver 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 66.5 | |
| Zn | 19.2 to 25.5 | |
| Ni | 11 to 13 | |
| Mn | 0 to 0.5 | |
| Fe | 0 to 0.25 | |
| 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
ASM Specialty Handbook: Copper and Copper Alloys, J. R. Davis (editor), 2001