ASTM B780 Alloy vs. EN 2.4964 Cobalt

ASTM B780 alloy belongs to the otherwise unclassified metals classification, while EN 2.4964 cobalt belongs to the cobalt alloys. There are 16 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 ASTM B780 alloy and the bottom bar is EN 2.4964 cobalt.

ASTM B780 Silver-Copper-Nickel Electrical Contact Alloy EN 2.4964 (CoCr20W15Ni) Cobalt Alloy

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		83
Elastic (Young's, Tensile) Modulus, GPa		220

Elongation at Break, %		1.1 to 9.1
Elongation at Break, %		40

Poisson's Ratio		0.36
Poisson's Ratio		0.29

Shear Modulus, GPa		30
Shear Modulus, GPa		86

Tensile Strength: Ultimate (UTS), MPa		330 to 590
Tensile Strength: Ultimate (UTS), MPa		960

Thermal Properties

Latent Heat of Fusion, J/g		140
Latent Heat of Fusion, J/g		290

Specific Heat Capacity, J/kg-K		270
Specific Heat Capacity, J/kg-K		400

Thermal Expansion, µm/m-K		18
Thermal Expansion, µm/m-K		12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS		70 to 76
Electrical Conductivity: Equal Volume, % IACS		1.9

Electrical Conductivity: Equal Weight (Specific), % IACS		62 to 68
Electrical Conductivity: Equal Weight (Specific), % IACS		1.8

Otherwise Unclassified Properties

Density, g/cm³		10
Density, g/cm³		9.6

Common Calculations

Stiffness to Weight: Axial, points		4.5
Stiffness to Weight: Axial, points		13

Stiffness to Weight: Bending, points		14
Stiffness to Weight: Bending, points		21

Strength to Weight: Axial, points		9.1 to 16
Strength to Weight: Axial, points		28

Strength to Weight: Bending, points		11 to 15
Strength to Weight: Bending, points		23

Thermal Shock Resistance, points		16 to 29
Thermal Shock Resistance, points		25

Alloy Composition

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

Carbon (C), %		0
Carbon (C), %		0.050 to 0.15

Chromium (Cr), %		0
Chromium (Cr), %		19 to 21

Cobalt (Co), %		0
Cobalt (Co), %		46.4 to 58

Copper (Cu), %		23.5 to 25.7
Copper (Cu), %		0

Iron (Fe), %		0 to 0.050
Iron (Fe), %		0 to 3.0

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

Manganese (Mn), %		0
Manganese (Mn), %		0 to 2.0

Nickel (Ni), %		0.35 to 0.65
Nickel (Ni), %		9.0 to 11

Phosphorus (P), %		0
Phosphorus (P), %		0 to 0.020

Silicon (Si), %		0
Silicon (Si), %		0 to 0.4

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

Sulfur (S), %		0
Sulfur (S), %		0 to 0.015

Tungsten (W), %		0
Tungsten (W), %		14 to 16

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