C70250 Copper vs. ASTM B617 Coin Silver

C70250 copper belongs to the copper alloys classification, while ASTM B617 coin silver belongs to the otherwise unclassified metals. There are 17 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is C70250 copper and the bottom bar is ASTM B617 coin silver.

UNS C70250 (CW112C) Nickel-Silicon Copper ASTM B617 Coin Silver Electrical Contact Alloy

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		120
Elastic (Young's, Tensile) Modulus, GPa		75

Poisson's Ratio		0.34
Poisson's Ratio		0.37

Shear Modulus, GPa		44
Shear Modulus, GPa		28

Tensile Strength: Ultimate (UTS), MPa		520 to 740
Tensile Strength: Ultimate (UTS), MPa		290 to 520

Thermal Properties

Latent Heat of Fusion, J/g		220
Latent Heat of Fusion, J/g		120

Melting Completion (Liquidus), °C		1100
Melting Completion (Liquidus), °C		870

Melting Onset (Solidus), °C		1080
Melting Onset (Solidus), °C		780

Specific Heat Capacity, J/kg-K		390
Specific Heat Capacity, J/kg-K		250

Thermal Expansion, µm/m-K		17
Thermal Expansion, µm/m-K		19

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS		36 to 50
Electrical Conductivity: Equal Volume, % IACS		83

Electrical Conductivity: Equal Weight (Specific), % IACS		37 to 51
Electrical Conductivity: Equal Weight (Specific), % IACS		72

Otherwise Unclassified Properties

Density, g/cm³		8.9
Density, g/cm³		10

Common Calculations

Stiffness to Weight: Axial, points		7.4
Stiffness to Weight: Axial, points		4.1

Stiffness to Weight: Bending, points		18
Stiffness to Weight: Bending, points		14

Strength to Weight: Axial, points		16 to 23
Strength to Weight: Axial, points		7.7 to 14

Strength to Weight: Bending, points		16 to 21
Strength to Weight: Bending, points		9.3 to 14

Thermal Shock Resistance, points		18 to 26
Thermal Shock Resistance, points		14 to 25

Alloy Composition

Aluminum (Al), %		0
Aluminum (Al), %		0 to 0.0050

Cadmium (Cd), %		0
Cadmium (Cd), %		0 to 0.050

Copper (Cu), %		92.7 to 97.5
Copper (Cu), %		9.0 to 10.4

Iron (Fe), %		0
Iron (Fe), %		0 to 0.050

Lead (Pb), %		0 to 0.050
Lead (Pb), %		0 to 0.030

Magnesium (Mg), %		0.050 to 0.3
Magnesium (Mg), %		0

Manganese (Mn), %		0 to 0.1
Manganese (Mn), %		0

Nickel (Ni), %		2.2 to 4.2
Nickel (Ni), %		0 to 0.010

Phosphorus (P), %		0
Phosphorus (P), %		0 to 0.020

Silicon (Si), %		0.25 to 1.2
Silicon (Si), %		0

Silver (Ag), %		0
Silver (Ag), %		89.6 to 91

Zinc (Zn), %		0 to 1.0
Zinc (Zn), %		0 to 0.060

Residuals, %		0
Residuals, %		0 to 0.060