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ASTM A356 Grade 9 vs. ASTM B477 Au-Ni-Ag

ASTM A356 grade 9 belongs to the iron alloys classification, while ASTM B477 Au-Ni-Ag belongs to the otherwise unclassified metals. There are 18 material properties with values for both materials. Properties with values for just one material (16, 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 A356 grade 9 and the bottom bar is ASTM B477 Au-Ni-Ag.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
95
Elongation at Break, % 17
5.5 to 11
Poisson's Ratio 0.29
0.41
Shear Modulus, GPa 73
34
Tensile Strength: Ultimate (UTS), MPa 670
310 to 550

Thermal Properties

Latent Heat of Fusion, J/g 260
80
Melting Completion (Liquidus), °C 1470
1010
Melting Onset (Solidus), °C 1430
930
Specific Heat Capacity, J/kg-K 470
160
Thermal Expansion, µm/m-K 13
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.5
14
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
7.5

Otherwise Unclassified Properties

Density, g/cm3 7.8
17

Common Calculations

Stiffness to Weight: Axial, points 13
3.1
Stiffness to Weight: Bending, points 24
8.9
Strength to Weight: Axial, points 24
5.0 to 9.0
Strength to Weight: Bending, points 22
6.0 to 8.8
Thermal Shock Resistance, points 19
16 to 28

Alloy Composition

Carbon (C), % 0 to 0.2
0
Chromium (Cr), % 1.0 to 1.5
0
Gold (Au), % 0
74.2 to 75.8
Iron (Fe), % 95.2 to 97.2
0
Manganese (Mn), % 0.5 to 0.9
0
Molybdenum (Mo), % 0.9 to 1.2
0
Nickel (Ni), % 0
2.6 to 3.4
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0.2 to 0.6
0
Silver (Ag), % 0
21.4 to 22.6
Sulfur (S), % 0 to 0.030
0
Vanadium (V), % 0.2 to 0.35
0
Residuals, % 0
0 to 0.3