ASTM B780 Alloy vs. C21000 Brass

ASTM B780 alloy belongs to the otherwise unclassified metals classification, while C21000 brass 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 17 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 C21000 brass.

ASTM B780 Silver-Copper-Nickel Electrical Contact Alloy UNS C21000 (CW500L) Gilding Brass

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		83
Elastic (Young's, Tensile) Modulus, GPa		110

Elongation at Break, %		1.1 to 9.1
Elongation at Break, %		2.9 to 50

Poisson's Ratio		0.36
Poisson's Ratio		0.34

Shear Modulus, GPa		30
Shear Modulus, GPa		43

Shear Strength, MPa		200 to 340
Shear Strength, MPa		180 to 280

Tensile Strength: Ultimate (UTS), MPa		330 to 590
Tensile Strength: Ultimate (UTS), MPa		240 to 450

Thermal Properties

Latent Heat of Fusion, J/g		140
Latent Heat of Fusion, J/g		200

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		18

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS		70 to 76
Electrical Conductivity: Equal Volume, % IACS		56

Electrical Conductivity: Equal Weight (Specific), % IACS		62 to 68
Electrical Conductivity: Equal Weight (Specific), % IACS		57

Otherwise Unclassified Properties

Density, g/cm³		10
Density, g/cm³		8.8

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		7.4 to 14

Strength to Weight: Bending, points		11 to 15
Strength to Weight: Bending, points		9.6 to 15

Thermal Shock Resistance, points		16 to 29
Thermal Shock Resistance, points		8.1 to 15

Alloy Composition

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

Copper (Cu), %		23.5 to 25.7
Copper (Cu), %		94 to 96

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

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

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

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

Zinc (Zn), %		0 to 0.060
Zinc (Zn), %		3.7 to 6.0

Residuals, %		0
Residuals, %		0 to 0.2