C72900 Copper-nickel vs. 70Ag-30Ni Alloy

C72900 copper-nickel belongs to the copper alloys classification, while 70Ag-30Ni alloy belongs to the otherwise unclassified metals. There are 17 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is C72900 copper-nickel and the bottom bar is 70Ag-30Ni alloy.

UNS C72900 Tin-Bearing Copper-Nickel 70-Silver 30-Nickel Electrical Contact Alloy

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		120
Elastic (Young's, Tensile) Modulus, GPa		100

Poisson's Ratio		0.34
Poisson's Ratio		0.35

Shear Modulus, GPa		45
Shear Modulus, GPa		39

Tensile Strength: Ultimate (UTS), MPa		870 to 1080
Tensile Strength: Ultimate (UTS), MPa		320 to 530

Thermal Properties

Latent Heat of Fusion, J/g		210
Latent Heat of Fusion, J/g		170

Melting Completion (Liquidus), °C		1120
Melting Completion (Liquidus), °C		960

Melting Onset (Solidus), °C		950
Melting Onset (Solidus), °C		960

Specific Heat Capacity, J/kg-K		380
Specific Heat Capacity, J/kg-K		300

Thermal Expansion, µm/m-K		17
Thermal Expansion, µm/m-K		17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS		7.8
Electrical Conductivity: Equal Volume, % IACS		69

Electrical Conductivity: Equal Weight (Specific), % IACS		8.0
Electrical Conductivity: Equal Weight (Specific), % IACS		62

Otherwise Unclassified Properties

Density, g/cm³		8.8
Density, g/cm³		10

Common Calculations

Stiffness to Weight: Axial, points		7.6
Stiffness to Weight: Axial, points		5.8

Stiffness to Weight: Bending, points		19
Stiffness to Weight: Bending, points		16

Strength to Weight: Axial, points		27 to 34
Strength to Weight: Axial, points		8.8 to 15

Strength to Weight: Bending, points		23 to 27
Strength to Weight: Bending, points		10 to 15

Thermal Shock Resistance, points		31 to 38
Thermal Shock Resistance, points		13 to 21

Alloy Composition

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Copper (Cu), %		74.1 to 78
Copper (Cu), %		0

Iron (Fe), %		0 to 0.5
Iron (Fe), %		0

Lead (Pb), %		0 to 0.020
Lead (Pb), %		0

Magnesium (Mg), %		0 to 0.15
Magnesium (Mg), %		0

Manganese (Mn), %		0 to 0.3
Manganese (Mn), %		0

Nickel (Ni), %		14.5 to 15.5
Nickel (Ni), %		28.8 to 31

Niobium (Nb), %		0 to 0.1
Niobium (Nb), %		0

Silver (Ag), %		0
Silver (Ag), %		69 to 71

Tin (Sn), %		7.5 to 8.5
Tin (Sn), %		0

Zinc (Zn), %		0 to 0.5
Zinc (Zn), %		0

Residuals, %		0 to 0.3
Residuals, %		0 to 0.2