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ASTM B477 Au-Ni-Ag vs. C27400 Brass

ASTM B477 Au-Ni-Ag belongs to the otherwise unclassified metals classification, while C27400 brass belongs to the copper alloys. There are 17 material properties with values for both materials. Properties with values for just one material (12, 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 ASTM B477 Au-Ni-Ag and the bottom bar is C27400 brass.

ASTM B477 Gold-Nickel-Silver Electrical Contact AlloyUNS C27400 (CW508L) Yellow Brass
Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 95
110
Poisson's Ratio 0.41
0.31
Shear Modulus, GPa 34
40
Tensile Strength: Ultimate (UTS), MPa 310 to 550
370 to 650

Thermal Properties

Latent Heat of Fusion, J/g 80
170
Melting Completion (Liquidus), °C 1010
920
Melting Onset (Solidus), °C 930
870
Specific Heat Capacity, J/kg-K 160
390
Thermal Expansion, µm/m-K 15
21

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 14
28
Electrical Conductivity: Equal Weight (Specific), % IACS 7.5
31

Otherwise Unclassified Properties

Density, g/cm3 17
8.0

Common Calculations

Stiffness to Weight: Axial, points 3.1
7.2
Stiffness to Weight: Bending, points 8.9
20
Strength to Weight: Axial, points 5.0 to 9.0
13 to 23
Strength to Weight: Bending, points 6.0 to 8.8
14 to 21
Thermal Shock Resistance, points 16 to 28
12 to 22

Alloy Composition

Copper (Cu), % 0
61 to 64
Gold (Au), % 74.2 to 75.8
0
Iron (Fe), % 0
0 to 0.1
Lead (Pb), % 0
0 to 0.050
Nickel (Ni), % 2.6 to 3.4
0
Silver (Ag), % 21.4 to 22.6
0
Zinc (Zn), % 0
35.6 to 39
Residuals, % 0
0 to 0.3