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C68700 Brass vs. ASTM B596 Au-Cu

C68700 brass belongs to the copper alloys classification, while ASTM B596 Au-Cu belongs to the otherwise unclassified metals. There are 17 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is C68700 brass and the bottom bar is ASTM B596 Au-Cu.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
100
Poisson's Ratio 0.32
0.41
Shear Modulus, GPa 41
36
Tensile Strength: Ultimate (UTS), MPa 390
450 to 620

Thermal Properties

Latent Heat of Fusion, J/g 190
77
Melting Completion (Liquidus), °C 970
1060
Melting Onset (Solidus), °C 930
930
Specific Heat Capacity, J/kg-K 400
150
Thermal Expansion, µm/m-K 19
14

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 23
14
Electrical Conductivity: Equal Weight (Specific), % IACS 25
6.7

Otherwise Unclassified Properties

Density, g/cm3 8.3
18

Common Calculations

Stiffness to Weight: Axial, points 7.3
3.1
Stiffness to Weight: Bending, points 19
8.5
Strength to Weight: Axial, points 13
6.8 to 9.4
Strength to Weight: Bending, points 14
7.1 to 8.8
Thermal Shock Resistance, points 13
22 to 30

Alloy Composition

Aluminum (Al), % 1.8 to 2.5
0
Arsenic (As), % 0.020 to 0.1
0
Copper (Cu), % 76 to 79
9.0 to 11
Gold (Au), % 0
89 to 91
Iron (Fe), % 0 to 0.060
0
Lead (Pb), % 0 to 0.070
0
Zinc (Zn), % 17.8 to 22.2
0
Residuals, % 0
0 to 0.4