ASTM B780 Alloy vs. Grade CW6MC Nickel

ASTM B780 alloy belongs to the otherwise unclassified metals classification, while grade CW6MC nickel belongs to the nickel alloys. 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 grade CW6MC nickel.

ASTM B780 Silver-Copper-Nickel Electrical Contact Alloy Grade CW6MC (J26625) Cast Nickel

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		83
Elastic (Young's, Tensile) Modulus, GPa		200

Elongation at Break, %		1.1 to 9.1
Elongation at Break, %		28

Poisson's Ratio		0.36
Poisson's Ratio		0.29

Shear Modulus, GPa		30
Shear Modulus, GPa		79

Tensile Strength: Ultimate (UTS), MPa		330 to 590
Tensile Strength: Ultimate (UTS), MPa		540

Thermal Properties

Latent Heat of Fusion, J/g		140
Latent Heat of Fusion, J/g		330

Specific Heat Capacity, J/kg-K		270
Specific Heat Capacity, J/kg-K		440

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		1.3

Electrical Conductivity: Equal Weight (Specific), % IACS		62 to 68
Electrical Conductivity: Equal Weight (Specific), % IACS		1.4

Otherwise Unclassified Properties

Density, g/cm³		10
Density, g/cm³		8.6

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		23

Strength to Weight: Axial, points		9.1 to 16
Strength to Weight: Axial, points		18

Strength to Weight: Bending, points		11 to 15
Strength to Weight: Bending, points		17

Thermal Shock Resistance, points		16 to 29
Thermal Shock Resistance, points		15

Alloy Composition

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

Carbon (C), %		0
Carbon (C), %		0 to 0.060

Chromium (Cr), %		0
Chromium (Cr), %		20 to 23

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

Iron (Fe), %		0 to 0.050
Iron (Fe), %		0 to 5.0

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

Manganese (Mn), %		0
Manganese (Mn), %		0 to 1.0

Molybdenum (Mo), %		0
Molybdenum (Mo), %		8.0 to 10

Nickel (Ni), %		0.35 to 0.65
Nickel (Ni), %		55.4 to 68.9

Niobium (Nb), %		0
Niobium (Nb), %		3.2 to 4.5

Phosphorus (P), %		0
Phosphorus (P), %		0 to 0.015

Silicon (Si), %		0
Silicon (Si), %		0 to 1.0

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

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

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