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SAE-AISI 8640 Steel vs. AWS BVAu-8

SAE-AISI 8640 steel belongs to the iron alloys classification, while AWS BVAu-8 belongs to the otherwise unclassified metals. There are 15 material properties with values for both materials. Properties with values for just one material (17, 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 SAE-AISI 8640 steel and the bottom bar is AWS BVAu-8.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
100
Poisson's Ratio 0.29
0.42
Shear Modulus, GPa 73
36
Tensile Strength: Ultimate (UTS), MPa 570
140

Thermal Properties

Latent Heat of Fusion, J/g 250
71
Melting Completion (Liquidus), °C 1460
1240
Melting Onset (Solidus), °C 1420
1200
Specific Heat Capacity, J/kg-K 470
140
Thermal Expansion, µm/m-K 13
14

Otherwise Unclassified Properties

Density, g/cm3 7.8
19

Common Calculations

Stiffness to Weight: Axial, points 13
3.0
Stiffness to Weight: Bending, points 24
8.3
Strength to Weight: Axial, points 20
2.1
Strength to Weight: Bending, points 20
3.2
Thermal Shock Resistance, points 17
7.1

Alloy Composition

Cadmium (Cd), % 0
0 to 0.0010
Carbon (C), % 0.38 to 0.43
0 to 0.0050
Chromium (Cr), % 0.4 to 0.6
0
Gold (Au), % 0
91 to 93
Iron (Fe), % 96.6 to 97.8
0
Lead (Pb), % 0
0 to 0.0020
Manganese (Mn), % 0.75 to 1.0
0
Molybdenum (Mo), % 0.15 to 0.25
0
Nickel (Ni), % 0.4 to 0.7
0
Palladium (Pd), % 0
7.0 to 9.0
Phosphorus (P), % 0 to 0.035
0 to 0.0020
Silicon (Si), % 0.15 to 0.35
0
Sulfur (S), % 0 to 0.040
0
Zinc (Zn), % 0
0 to 0.0010