C81400 Copper vs. ASTM B628 Ag-Cu

C81400 copper belongs to the copper alloys classification, while ASTM B628 Ag-Cu belongs to the otherwise unclassified metals. They have a modest 28% of their average alloy composition in common, which, by itself, doesn't mean much. There are 18 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 C81400 copper and the bottom bar is ASTM B628 Ag-Cu.

UNS C81400 (Alloy 70C) Beryllium Copper ASTM B628 Silver-Copper Eutectic Electrical Contact Alloy

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		120
Elastic (Young's, Tensile) Modulus, GPa		83

Elongation at Break, %		11
Elongation at Break, %		1.1 to 17

Poisson's Ratio		0.34
Poisson's Ratio		0.36

Shear Modulus, GPa		41
Shear Modulus, GPa		31

Tensile Strength: Ultimate (UTS), MPa		370
Tensile Strength: Ultimate (UTS), MPa		350 to 760

Thermal Properties

Latent Heat of Fusion, J/g		210
Latent Heat of Fusion, J/g		140

Melting Completion (Liquidus), °C		1090
Melting Completion (Liquidus), °C		780

Melting Onset (Solidus), °C		1070
Melting Onset (Solidus), °C		780

Specific Heat Capacity, J/kg-K		390
Specific Heat Capacity, J/kg-K		280

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

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS		60
Electrical Conductivity: Equal Volume, % IACS		84

Electrical Conductivity: Equal Weight (Specific), % IACS		61
Electrical Conductivity: Equal Weight (Specific), % IACS		75

Otherwise Unclassified Properties

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

Common Calculations

Stiffness to Weight: Axial, points		7.3
Stiffness to Weight: Axial, points		4.6

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

Strength to Weight: Axial, points		11
Strength to Weight: Axial, points		9.5 to 21

Strength to Weight: Bending, points		13
Strength to Weight: Bending, points		11 to 18

Thermal Shock Resistance, points		13
Thermal Shock Resistance, points		16 to 34

Alloy Composition

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

Beryllium (Be), %		0.020 to 0.1
Beryllium (Be), %		0

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

Chromium (Cr), %		0.6 to 1.0
Chromium (Cr), %		0

Copper (Cu), %		98.4 to 99.38
Copper (Cu), %		26.6 to 29

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

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

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

Phosphorus (P), %		0
Phosphorus (P), %		0 to 0.030

Silver (Ag), %		0
Silver (Ag), %		71 to 73

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

Residuals, %		0
Residuals, %		0 to 0.21