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ASTM B477 Au-Ni-Ag vs. C69300 Brass

ASTM B477 Au-Ni-Ag belongs to the otherwise unclassified metals classification, while C69300 brass belongs to the copper alloys. There are 19 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 C69300 brass.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 95
110
Elongation at Break, % 5.5 to 11
8.5 to 15
Poisson's Ratio 0.41
0.32
Shear Modulus, GPa 34
41
Shear Strength, MPa 190 to 320
330 to 370
Tensile Strength: Ultimate (UTS), MPa 310 to 550
550 to 630

Thermal Properties

Latent Heat of Fusion, J/g 80
240
Melting Completion (Liquidus), °C 1010
880
Melting Onset (Solidus), °C 930
860
Specific Heat Capacity, J/kg-K 160
400
Thermal Expansion, µm/m-K 15
19

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 14
8.0
Electrical Conductivity: Equal Weight (Specific), % IACS 7.5
8.8

Otherwise Unclassified Properties

Density, g/cm3 17
8.2

Common Calculations

Stiffness to Weight: Axial, points 3.1
7.4
Stiffness to Weight: Bending, points 8.9
19
Strength to Weight: Axial, points 5.0 to 9.0
19 to 21
Strength to Weight: Bending, points 6.0 to 8.8
18 to 20
Thermal Shock Resistance, points 16 to 28
19 to 22

Alloy Composition

Copper (Cu), % 0
73 to 77
Gold (Au), % 74.2 to 75.8
0
Iron (Fe), % 0
0 to 0.1
Lead (Pb), % 0
0 to 0.090
Manganese (Mn), % 0
0 to 0.1
Nickel (Ni), % 2.6 to 3.4
0 to 0.1
Phosphorus (P), % 0
0.040 to 0.15
Silicon (Si), % 0
2.7 to 3.4
Silver (Ag), % 21.4 to 22.6
0
Tin (Sn), % 0
0 to 0.2
Zinc (Zn), % 0
18.4 to 24.3
Residuals, % 0
0 to 0.5