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UNS C73500 Nickel Silver

C73500 nickel silver is a copper-nickel alloy formulated for primary forming into wrought products. C73500 is the UNS number for this material. Additionally, the common industry name is 72-18-10. Older literature may refer to this material as ASTM Copper-Nickel Type 1, but this is now discouraged.

The properties of C73500 nickel silver include five 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 C73500 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

130 GPa 18 x 106 psi

Poisson's Ratio

0.33

Rockwell B Hardness

73 to 88

Rockwell Superficial 30T Hardness

65 to 75

Shear Modulus

47 GPa 6.9 x 106 psi

Tensile Strength: Ultimate (UTS)

380 to 580 MPa 55 to 84 x 103 psi

Thermal Properties

Latent Heat of Fusion

210 J/g

Maximum Temperature: Mechanical

220 °C 420 °F

Melting Completion (Liquidus)

1140 °C 2080 °F

Melting Onset (Solidus)

1090 °C 2000 °F

Specific Heat Capacity

400 J/kg-K 0.095 BTU/lb-°F

Thermal Conductivity

36 W/m-K 21 BTU/h-ft-°F

Thermal Expansion

17 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

6.5 % IACS

Electrical Conductivity: Equal Weight (Specific)

6.7 % IACS

Otherwise Unclassified Properties

Base Metal Price

35 % relative

Density

8.7 g/cm3 540 lb/ft3

Embodied Carbon

4.0 kg CO2/kg material

Embodied Energy

61 MJ/kg 26 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

12 to 19 points

Strength to Weight: Bending

13 to 18 points

Thermal Diffusivity

10 mm2/s

Thermal Shock Resistance

13 to 19 points

Alloy Composition

Among wrought copper alloys, the composition of C73500 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.

Copper (Cu) 70.5 to 73.5
Nickel (Ni) 16.5 to 19.5
Zinc (Zn) 5.7 to 13
Manganese (Mn) 0 to 0.5
Iron (Fe) 0 to 0.25
Lead (Pb) 0 to 0.1
Residuals 0 to 0.5

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

Followup Questions

Similar Alloys

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