CC750S Brass vs. ASTM B780 Alloy

CC750S brass 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 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 CC750S brass and the bottom bar is ASTM B780 alloy.

EN CC750S (CuZn33Pb2-C) Leaded Brass ASTM B780 Silver-Copper-Nickel Electrical Contact Alloy

Metric UnitsUS Customary Units

Mechanical Properties

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

Elongation at Break, %		13
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

Tensile Strength: Ultimate (UTS), MPa		200
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		20
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		26
Electrical Conductivity: Equal Weight (Specific), % IACS		62 to 68

Otherwise Unclassified Properties

Density, g/cm³		8.2
Density, g/cm³		10

Common Calculations

Stiffness to Weight: Axial, points		7.1
Stiffness to Weight: Axial, points		4.5

Stiffness to Weight: Bending, points		19
Stiffness to Weight: Bending, points		14

Strength to Weight: Axial, points		6.8
Strength to Weight: Axial, points		9.1 to 16

Strength to Weight: Bending, points		9.3
Strength to Weight: Bending, points		11 to 15

Thermal Shock Resistance, points		6.7
Thermal Shock Resistance, points		16 to 29

Alloy Composition

Aluminum (Al), %		0 to 0.1
Aluminum (Al), %		0

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

Copper (Cu), %		62 to 67
Copper (Cu), %		23.5 to 25.7

Iron (Fe), %		0 to 0.8
Iron (Fe), %		0 to 0.050

Lead (Pb), %		1.0 to 3.0
Lead (Pb), %		0 to 0.030

Manganese (Mn), %		0 to 0.2
Manganese (Mn), %		0

Nickel (Ni), %		0 to 1.0
Nickel (Ni), %		0.35 to 0.65

Phosphorus (P), %		0 to 0.050
Phosphorus (P), %		0

Silicon (Si), %		0 to 0.050
Silicon (Si), %		0

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

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

Zinc (Zn), %		26.3 to 36
Zinc (Zn), %		0 to 0.060