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C75700 Nickel Silver vs. C72900 Copper-nickel

Both C75700 nickel silver and C72900 copper-nickel are copper alloys. They have 78% of their average alloy composition in common.

For each property being compared, the top bar is C75700 nickel silver and the bottom bar is C72900 copper-nickel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 120
120
Elongation at Break, % 3.2 to 22
6.0 to 20
Poisson's Ratio 0.32
0.34
Shear Modulus, GPa 45
45
Shear Strength, MPa 350 to 370
540 to 630
Tensile Strength: Ultimate (UTS), MPa 590 to 610
870 to 1080
Tensile Strength: Yield (Proof), MPa 470 to 580
700 to 920

Thermal Properties

Latent Heat of Fusion, J/g 200
210
Maximum Temperature: Mechanical, °C 180
210
Melting Completion (Liquidus), °C 1040
1120
Melting Onset (Solidus), °C 990
950
Specific Heat Capacity, J/kg-K 390
380
Thermal Conductivity, W/m-K 40
29
Thermal Expansion, µm/m-K 16
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.0
7.8
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
8.0

Otherwise Unclassified Properties

Base Metal Price, % relative 30
39
Density, g/cm3 8.4
8.8
Embodied Carbon, kg CO2/kg material 3.6
4.6
Embodied Energy, MJ/kg 56
72
Embodied Water, L/kg 310
360

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 19 to 120
49 to 210
Resilience: Unit (Modulus of Resilience), kJ/m3 930 to 1410
2030 to 3490
Stiffness to Weight: Axial, points 7.8
7.6
Stiffness to Weight: Bending, points 19
19
Strength to Weight: Axial, points 19 to 20
27 to 34
Strength to Weight: Bending, points 19
23 to 27
Thermal Diffusivity, mm2/s 12
8.6
Thermal Shock Resistance, points 22 to 23
31 to 38

Alloy Composition

Copper (Cu), % 63.5 to 66.5
74.1 to 78
Iron (Fe), % 0 to 0.25
0 to 0.5
Lead (Pb), % 0 to 0.050
0 to 0.020
Magnesium (Mg), % 0
0 to 0.15
Manganese (Mn), % 0 to 0.5
0 to 0.3
Nickel (Ni), % 11 to 13
14.5 to 15.5
Niobium (Nb), % 0
0 to 0.1
Tin (Sn), % 0
7.5 to 8.5
Zinc (Zn), % 19.2 to 25.5
0 to 0.5
Residuals, % 0 to 0.5
0 to 0.3