Annealed ASTM B780 Alloy vs. Annealed R30605 Cobalt

Annealed ASTM B780 alloy belongs to the otherwise unclassified metals classification, while annealed R30605 cobalt belongs to the cobalt alloys. There are 17 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is annealed ASTM B780 alloy and the bottom bar is annealed R30605 cobalt.

Annealed ASTM B780 Silver-Copper-Nickel Alloy Annealed R30605 Alloy

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		83
Elastic (Young's, Tensile) Modulus, GPa		210

Elongation at Break, %		9.1
Elongation at Break, %		34

Poisson's Ratio		0.36
Poisson's Ratio		0.29

Shear Modulus, GPa		30
Shear Modulus, GPa		81

Tensile Strength: Ultimate (UTS), MPa		330
Tensile Strength: Ultimate (UTS), MPa		1130

Thermal Properties

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

Melting Completion (Liquidus), °C		860
Melting Completion (Liquidus), °C		1410

Specific Heat Capacity, J/kg-K		270
Specific Heat Capacity, J/kg-K		410

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

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS		76
Electrical Conductivity: Equal Volume, % IACS		2.0

Electrical Conductivity: Equal Weight (Specific), % IACS		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		12

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

Strength to Weight: Axial, points		9.1
Strength to Weight: Axial, points		33

Strength to Weight: Bending, points		11
Strength to Weight: Bending, points		25

Thermal Shock Resistance, points		16
Thermal Shock Resistance, points		31

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 57

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), %		1.0 to 2.0

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

Phosphorus (P), %		0
Phosphorus (P), %		0 to 0.040

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

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

Sulfur (S), %		0
Sulfur (S), %		0 to 0.030

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

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