C81400 Copper vs. ASTM B780 Alloy

C81400 copper belongs to the copper alloys classification, while ASTM B780 alloy belongs to the otherwise unclassified metals. They have a modest 25% of their average alloy composition in common, which, by itself, doesn't mean much. There are 16 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.

For each property being compared, the top bar is C81400 copper and the bottom bar is ASTM B780 alloy.

UNS C81400 (Alloy 70C) Beryllium Copper ASTM B780 Silver-Copper-Nickel 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 9.1

Poisson's Ratio		0.34
Poisson's Ratio		0.36

Shear Modulus, GPa		41
Shear Modulus, GPa		30

Tensile Strength: Ultimate (UTS), MPa		370
Tensile Strength: Ultimate (UTS), MPa		330 to 590

Thermal Properties

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

Specific Heat Capacity, J/kg-K		390
Specific Heat Capacity, J/kg-K		270

Thermal Expansion, µm/m-K		17
Thermal Expansion, µm/m-K		18

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS		60
Electrical Conductivity: Equal Volume, % IACS		70 to 76

Electrical Conductivity: Equal Weight (Specific), % IACS		61
Electrical Conductivity: Equal Weight (Specific), % IACS		62 to 68

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		4.5

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

Strength to Weight: Axial, points		11
Strength to Weight: Axial, points		9.1 to 16

Strength to Weight: Bending, points		13
Strength to Weight: Bending, points		11 to 15

Thermal Shock Resistance, points		13
Thermal Shock Resistance, points		16 to 29

Alloy Composition

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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), %		23.5 to 25.7

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

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

Nickel (Ni), %		0
Nickel (Ni), %		0.35 to 0.65

Silver (Ag), %		0
Silver (Ag), %		74 to 76

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

Residuals, %		0 to 0.5
Residuals, %		0