C99300 Copper vs. ASTM B780 Alloy

C99300 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 C99300 copper and the bottom bar is ASTM B780 alloy.

UNS C99300 Nickel-Aluminum 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, %		2.0
Elongation at Break, %		1.1 to 9.1

Poisson's Ratio		0.33
Poisson's Ratio		0.36

Shear Modulus, GPa		46
Shear Modulus, GPa		30

Tensile Strength: Ultimate (UTS), MPa		660
Tensile Strength: Ultimate (UTS), MPa		330 to 590

Thermal Properties

Latent Heat of Fusion, J/g		240
Latent Heat of Fusion, J/g		140

Specific Heat Capacity, J/kg-K		450
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		9.0
Electrical Conductivity: Equal Volume, % IACS		70 to 76

Electrical Conductivity: Equal Weight (Specific), % IACS		9.8
Electrical Conductivity: Equal Weight (Specific), % IACS		62 to 68

Otherwise Unclassified Properties

Density, g/cm³		8.2
Density, g/cm³		10

Common Calculations

Stiffness to Weight: Axial, points		8.3
Stiffness to Weight: Axial, points		4.5

Stiffness to Weight: Bending, points		20
Stiffness to Weight: Bending, points		14

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

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

Thermal Shock Resistance, points		22
Thermal Shock Resistance, points		16 to 29

Alloy Composition

Aluminum (Al), %		10.7 to 11.5
Aluminum (Al), %		0

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

Cobalt (Co), %		1.0 to 2.0
Cobalt (Co), %		0

Copper (Cu), %		68.6 to 74.4
Copper (Cu), %		23.5 to 25.7

Iron (Fe), %		0.4 to 1.0
Iron (Fe), %		0 to 0.050

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

Nickel (Ni), %		13.5 to 16.5
Nickel (Ni), %		0.35 to 0.65

Silicon (Si), %		0 to 0.020
Silicon (Si), %		0

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

Tin (Sn), %		0 to 0.050
Tin (Sn), %		0

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

Residuals, %		0 to 0.3
Residuals, %		0