ASTM B780 Alloy vs. CR007A Copper

ASTM B780 alloy belongs to the otherwise unclassified metals classification, while CR007A 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 (13, in this case) are not shown.

For each property being compared, the top bar is ASTM B780 alloy and the bottom bar is CR007A copper.

ASTM B780 Silver-Copper-Nickel Electrical Contact Alloy EN CR007A (Cu-OF1) Oxygen-Free 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, %		15

Poisson's Ratio		0.36
Poisson's Ratio		0.34

Shear Modulus, GPa		30
Shear Modulus, GPa		43

Tensile Strength: Ultimate (UTS), MPa		330 to 590
Tensile Strength: Ultimate (UTS), MPa		230

Thermal Properties

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

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		100

Electrical Conductivity: Equal Weight (Specific), % IACS		62 to 68
Electrical Conductivity: Equal Weight (Specific), % IACS		100

Otherwise Unclassified Properties

Density, g/cm³		10
Density, g/cm³		9.0

Common Calculations

Stiffness to Weight: Axial, points		4.5
Stiffness to Weight: Axial, points		7.2

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		7.1

Strength to Weight: Bending, points		11 to 15
Strength to Weight: Bending, points		9.3

Thermal Shock Resistance, points		16 to 29
Thermal Shock Resistance, points		8.1

Alloy Composition

Antimony (Sb), %		0
Antimony (Sb), %		0 to 0.00040

Arsenic (As), %		0
Arsenic (As), %		0 to 0.00050

Bismuth (Bi), %		0
Bismuth (Bi), %		0 to 0.00020

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

Copper (Cu), %		23.5 to 25.7
Copper (Cu), %		99.994 to 100

Iron (Fe), %		0 to 0.050
Iron (Fe), %		0 to 0.0010

Lead (Pb), %		0 to 0.030
Lead (Pb), %		0 to 0.00050

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

Selenium (Se), %		0
Selenium (Se), %		0 to 0.00020

Silver (Ag), %		74 to 76
Silver (Ag), %		0 to 0.0025

Sulfur (S), %		0
Sulfur (S), %		0 to 0.0015

Tellurium (Te), %		0
Tellurium (Te), %		0 to 0.00020

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