UNS C75200 (CW409J) Nickel Silver
C75200 nickel silver is a copper-nickel alloy formulated for primary forming into wrought products. CW409J is the EN numeric designation for this material. C75200 is the UNS number. Additionally, the British Standard (BS) designation is NS106. And the common industry name is 65-18-17. Older literature may refer to this material as ASTM Nickel Silver Type 2, but this is now discouraged.
The properties of C75200 nickel silver include six 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 C75200 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 18 x 106 psi
Poisson's Ratio
0.32
Rockwell B Hardness
63 to 93
Rockwell Superficial 30T Hardness
58 to 78
Shear Modulus
47 GPa 6.8 x 106 psi
Tensile Strength: Ultimate (UTS)
400 to 660 MPa 58 to 96 x 103 psi
Thermal Properties
Latent Heat of Fusion
210 J/g
Maximum Temperature: Mechanical
200 °C 390 °F
Melting Completion (Liquidus)
1110 °C 2030 °F
Melting Onset (Solidus)
1070 °C 1960 °F
Specific Heat Capacity
400 J/kg-K 0.095 BTU/lb-°F
Thermal Conductivity
33 W/m-K 19 BTU/h-ft-°F
Thermal Expansion
18 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
6.0 % IACS
Electrical Conductivity: Equal Weight (Specific)
6.3 % IACS
Otherwise Unclassified Properties
Base Metal Price
33 % relative
Density
8.5 g/cm3 530 lb/ft3
Embodied Carbon
4.1 kg CO2/kg material
Embodied Energy
62 MJ/kg 27 x 103 BTU/lb
Embodied Water
300 L/kg 36 gal/lb
Common Calculations
Stiffness to Weight: Axial
8.0 points
Stiffness to Weight: Bending
19 points
Strength to Weight: Axial
13 to 21 points
Strength to Weight: Bending
14 to 20 points
Thermal Diffusivity
9.8 mm2/s
Thermal Shock Resistance
13 to 22 points
Alloy Composition
Among wrought copper alloys, the composition of C75200 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 | |
| Ni | 16.5 to 19.5 | |
| Zn | 12.7 to 20 | |
| 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
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
CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015