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C68300 Brass vs. ASTM B780 Alloy

C68300 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 15 material properties with values for both materials. Properties with values for just one material (15, in this case) are not shown.

For each property being compared, the top bar is C68300 brass and the bottom bar is ASTM B780 alloy.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 100
83
Elongation at Break, % 15
1.1 to 9.1
Poisson's Ratio 0.31
0.36
Shear Modulus, GPa 40
30
Shear Strength, MPa 260
200 to 340
Tensile Strength: Ultimate (UTS), MPa 430
330 to 590

Thermal Properties

Latent Heat of Fusion, J/g 180
140
Specific Heat Capacity, J/kg-K 390
270
Thermal Expansion, µm/m-K 20
18

Otherwise Unclassified Properties

Density, g/cm3 8.0
10

Common Calculations

Stiffness to Weight: Axial, points 7.3
4.5
Stiffness to Weight: Bending, points 20
14
Strength to Weight: Axial, points 15
9.1 to 16
Strength to Weight: Bending, points 16
11 to 15
Thermal Shock Resistance, points 14
16 to 29

Alloy Composition

Antimony (Sb), % 0.3 to 1.0
0
Cadmium (Cd), % 0 to 0.010
0 to 0.050
Copper (Cu), % 59 to 63
23.5 to 25.7
Iron (Fe), % 0
0 to 0.050
Lead (Pb), % 0 to 0.090
0 to 0.030
Nickel (Ni), % 0
0.35 to 0.65
Silicon (Si), % 0.3 to 1.0
0
Silver (Ag), % 0
74 to 76
Tin (Sn), % 0.050 to 0.2
0
Zinc (Zn), % 34.2 to 40.4
0 to 0.060
Residuals, % 0 to 0.5
0