C67600 Bronze vs. ASTM B780 Alloy

C67600 bronze belongs to the copper alloys classification, while ASTM B780 alloy belongs to the otherwise unclassified metals. 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 (12, in this case) are not shown.

For each property being compared, the top bar is C67600 bronze and the bottom bar is ASTM B780 alloy.

UNS C67600 Leaded Manganese Bronze ASTM B780 Silver-Copper-Nickel Electrical Contact Alloy

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		100
Elastic (Young's, Tensile) Modulus, GPa		83

Elongation at Break, %		13 to 33
Elongation at Break, %		1.1 to 9.1

Poisson's Ratio		0.31
Poisson's Ratio		0.36

Shear Modulus, GPa		40
Shear Modulus, GPa		30

Shear Strength, MPa		270 to 350
Shear Strength, MPa		200 to 340

Tensile Strength: Ultimate (UTS), MPa		430 to 570
Tensile Strength: Ultimate (UTS), MPa		330 to 590

Thermal Properties

Latent Heat of Fusion, J/g		170
Latent Heat of Fusion, J/g		140

Specific Heat Capacity, J/kg-K		380
Specific Heat Capacity, J/kg-K		270

Thermal Expansion, µm/m-K		21
Thermal Expansion, µm/m-K		18

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS		24
Electrical Conductivity: Equal Volume, % IACS		70 to 76

Electrical Conductivity: Equal Weight (Specific), % IACS		27
Electrical Conductivity: Equal Weight (Specific), % IACS		62 to 68

Otherwise Unclassified Properties

Density, g/cm³		8.0
Density, g/cm³		10

Common Calculations

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

Stiffness to Weight: Bending, points		20
Stiffness to Weight: Bending, points		14

Strength to Weight: Axial, points		15 to 20
Strength to Weight: Axial, points		9.1 to 16

Strength to Weight: Bending, points		16 to 19
Strength to Weight: Bending, points		11 to 15

Thermal Shock Resistance, points		14 to 19
Thermal Shock Resistance, points		16 to 29

Alloy Composition

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

Copper (Cu), %		57 to 60
Copper (Cu), %		23.5 to 25.7

Iron (Fe), %		0.4 to 1.3
Iron (Fe), %		0 to 0.050

Lead (Pb), %		0.5 to 1.0
Lead (Pb), %		0 to 0.030

Manganese (Mn), %		0.050 to 0.5
Manganese (Mn), %		0

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

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

Tin (Sn), %		0.5 to 1.5
Tin (Sn), %		0

Zinc (Zn), %		35.2 to 41.6
Zinc (Zn), %		0 to 0.060

Residuals, %		0 to 0.5
Residuals, %		0