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UNS C77400 Nickel Silver

C77400 nickel silver is a copper-nickel alloy formulated for primary forming into wrought products. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. C77400 is the UNS number for this material. Additionally, the common industry name is 45-10 Nickel Silver.

It has a moderately low base cost among wrought copper-nickels. In addition, it has the lowest melting temperature and a moderately high tensile strength.

The graph bars on the material properties cards below compare C77400 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

25 %

Poisson's Ratio

0.3

Rockwell B Hardness

73

Shear Modulus

42 GPa 6.1 x 106 psi

Shear Strength

360 MPa 53 x 103 psi

Tensile Strength: Ultimate (UTS)

570 MPa 83 x 103 psi

Tensile Strength: Yield (Proof)

250 MPa 36 x 103 psi

Thermal Properties

Latent Heat of Fusion

170 J/g

Maximum Temperature: Mechanical

130 °C 260 °F

Melting Completion (Liquidus)

810 °C 1490 °F

Melting Onset (Solidus)

770 °C 1420 °F

Specific Heat Capacity

390 J/kg-K 0.094 BTU/lb-°F

Thermal Expansion

21 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

27 % IACS

Electrical Conductivity: Equal Weight (Specific)

31 % IACS

Otherwise Unclassified Properties

Base Metal Price

25 % relative

Density

7.9 g/cm3 490 lb/ft3

Embodied Carbon

3.5 kg CO2/kg material

Embodied Energy

57 MJ/kg 24 x 103 BTU/lb

Embodied Water

320 L/kg 38 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

120 MJ/m3

Resilience: Unit (Modulus of Resilience)

290 kJ/m3

Stiffness to Weight: Axial

7.7 points

Stiffness to Weight: Bending

20 points

Strength to Weight: Axial

20 points

Strength to Weight: Bending

19 points

Thermal Shock Resistance

18 points

Alloy Composition

Among wrought copper alloys, the composition of C77400 nickel silver is notable for including nickel (Ni). Nickel is used to improve strength (particularly at elevated temperatures) and corrosion resistance.

Copper (Cu) 43 to 47
Zinc (Zn) 41.3 to 48
Nickel (Ni) 9.0 to 11
Lead (Pb) 0 to 0.2
Residuals 0 to 0.5

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

Followup Questions

Similar Alloys

Further Reading

ASTM B124: Standard Specification for Copper and Copper Alloy Forging Rod, Bar, and Shapes

ASTM B283: Standard Specification for Copper and Copper-Alloy Die Forgings (Hot-Pressed)

ASM Specialty Handbook: Copper and Copper Alloys, J. R. Davis (editor), 2001