MakeItFrom.com
Menu (ESC)

UNS C74500 Nickel Silver

C74500 nickel silver is a copper-nickel alloy formulated for primary forming into wrought products. C74500 is the UNS number for this material. Additionally, the common industry name is 65-10-24. Older literature may refer to this material as ASTM Nickel Silver Type 3, but this is now discouraged.

The properties of C74500 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 C74500 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

3.0 to 24 %

Poisson's Ratio

0.32

Rockwell B Hardness

66 to 94

Rockwell Superficial 30T Hardness

60 to 79

Shear Modulus

44 GPa 6.4 x 106 psi

Shear Strength

310 to 380 MPa 45 to 55 x 103 psi

Tensile Strength: Ultimate (UTS)

390 to 700 MPa 57 to 100 x 103 psi

Tensile Strength: Yield (Proof)

380 to 600 MPa 55 to 87 x 103 psi

Thermal Properties

Latent Heat of Fusion

190 J/g

Maximum Temperature: Mechanical

170 °C 340 °F

Melting Completion (Liquidus)

1020 °C 1870 °F

Melting Onset (Solidus)

970 °C 1780 °F

Specific Heat Capacity

390 J/kg-K 0.094 BTU/lb-°F

Thermal Conductivity

45 W/m-K 26 BTU/h-ft-°F

Thermal Expansion

19 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

9.0 % IACS

Electrical Conductivity: Equal Weight (Specific)

9.7 % IACS

Otherwise Unclassified Properties

Base Metal Price

29 % relative

Density

8.3 g/cm3 520 lb/ft3

Embodied Carbon

3.4 kg CO2/kg material

Embodied Energy

54 MJ/kg 23 x 103 BTU/lb

Embodied Water

310 L/kg 37 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

12 to 160 MJ/m3

Resilience: Unit (Modulus of Resilience)

620 to 1540 kJ/m3

Stiffness to Weight: Axial

7.7 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

13 to 23 points

Strength to Weight: Bending

14 to 21 points

Thermal Diffusivity

14 mm2/s

Thermal Shock Resistance

13 to 23 points

Alloy Composition

Among wrought copper alloys, the composition of C74500 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) 63.5 to 66.5
Zinc (Zn) 21.2 to 27.5
Nickel (Ni) 9.0 to 11
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 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