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UNS C78200 Leaded Nickel Silver

C78200 nickel silver is a copper-nickel alloy formulated for primary forming into wrought products.

The properties of C78200 nickel silver include seven 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 C78200 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

110 GPa 16 x 106 psi

Elongation at Break

3.0 to 40 %

Poisson's Ratio

0.32

Rockwell B Hardness

65 to 90

Rockwell Superficial 30T Hardness

63 to 75

Shear Modulus

43 GPa 6.2 x 106 psi

Shear Strength

280 to 400 MPa 40 to 58 x 103 psi

Tensile Strength: Ultimate (UTS)

370 to 630 MPa 53 to 91 x 103 psi

Tensile Strength: Yield (Proof)

170 to 570 MPa 25 to 83 x 103 psi

Thermal Properties

Latent Heat of Fusion

190 J/g

Maximum Temperature: Mechanical

160 °C 320 °F

Melting Completion (Liquidus)

1000 °C 1830 °F

Melting Onset (Solidus)

970 °C 1780 °F

Specific Heat Capacity

390 J/kg-K 0.092 BTU/lb-°F

Thermal Conductivity

48 W/m-K 28 BTU/h-ft-°F

Thermal Expansion

19 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

11 % IACS

Electrical Conductivity: Equal Weight (Specific)

12 % IACS

Otherwise Unclassified Properties

Base Metal Price

28 % relative

Density

8.4 g/cm3 520 lb/ft3

Embodied Carbon

3.3 kg CO2/kg material

Embodied Energy

52 MJ/kg 22 x 103 BTU/lb

Embodied Water

310 L/kg 37 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

18 to 120 MJ/m3

Resilience: Unit (Modulus of Resilience)

130 to 1440 kJ/m3

Stiffness to Weight: Axial

7.4 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

12 to 21 points

Strength to Weight: Bending

14 to 19 points

Thermal Diffusivity

15 mm2/s

Thermal Shock Resistance

12 to 21 points

Alloy Composition

Among wrought copper alloys, the composition of C78200 nickel silver is notable for including manganese (Mn) and containing a comparatively high amount of lead (Pb). Manganese is used to improve strength without a proportional reduction in ductility. Lead is used to improve machinability and bearing properties, at the cost of toxicity.

Copper (Cu) 63 to 67
Zinc (Zn) 20.2 to 28.5
Nickel (Ni) 7.0 to 9.0
Lead (Pb) 1.5 to 2.5
Manganese (Mn) 0 to 0.5
Iron (Fe) 0 to 0.35
Residuals 0 to 0.5

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

Followup Questions

Similar Alloys

Further Reading

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

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015