ASTM B780 Alloy vs. C82000 Copper

ASTM B780 alloy belongs to the otherwise unclassified metals classification, while C82000 copper belongs to the copper alloys. 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 ASTM B780 alloy and the bottom bar is C82000 copper.

ASTM B780 Silver-Copper-Nickel Electrical Contact Alloy UNS C82000 (Alloy 10C) Cobalt-Beryllium Copper

Metric UnitsUS Customary Units

Mechanical Properties

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

Elongation at Break, %		1.1 to 9.1
Elongation at Break, %		8.0 to 20

Poisson's Ratio		0.36
Poisson's Ratio		0.34

Shear Modulus, GPa		30
Shear Modulus, GPa		45

Tensile Strength: Ultimate (UTS), MPa		330 to 590
Tensile Strength: Ultimate (UTS), MPa		350 to 690

Thermal Properties

Latent Heat of Fusion, J/g		140
Latent Heat of Fusion, J/g		220

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

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

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS		70 to 76
Electrical Conductivity: Equal Volume, % IACS		45

Electrical Conductivity: Equal Weight (Specific), % IACS		62 to 68
Electrical Conductivity: Equal Weight (Specific), % IACS		46

Otherwise Unclassified Properties

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

Common Calculations

Stiffness to Weight: Axial, points		4.5
Stiffness to Weight: Axial, points		7.5

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

Strength to Weight: Axial, points		9.1 to 16
Strength to Weight: Axial, points		11 to 22

Strength to Weight: Bending, points		11 to 15
Strength to Weight: Bending, points		12 to 20

Thermal Shock Resistance, points		16 to 29
Thermal Shock Resistance, points		12 to 24

Alloy Composition

Aluminum (Al), %		0
Aluminum (Al), %		0 to 0.1

Beryllium (Be), %		0
Beryllium (Be), %		0.45 to 0.8

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

Chromium (Cr), %		0
Chromium (Cr), %		0 to 0.1

Cobalt (Co), %		0
Cobalt (Co), %		2.2 to 2.7

Copper (Cu), %		23.5 to 25.7
Copper (Cu), %		95.2 to 97.4

Iron (Fe), %		0 to 0.050
Iron (Fe), %		0 to 0.1

Lead (Pb), %		0 to 0.030
Lead (Pb), %		0 to 0.020

Nickel (Ni), %		0.35 to 0.65
Nickel (Ni), %		0 to 0.2

Silicon (Si), %		0
Silicon (Si), %		0 to 0.15

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

Tin (Sn), %		0
Tin (Sn), %		0 to 0.1

Zinc (Zn), %		0 to 0.060
Zinc (Zn), %		0 to 0.1

Residuals, %		0
Residuals, %		0 to 0.5