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SAE-AISI A9 Steel vs. AWS BAu-4

SAE-AISI A9 steel belongs to the iron alloys classification, while AWS BAu-4 belongs to the otherwise unclassified metals. There are 15 material properties with values for both materials. Properties with values for just one material (10, 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 A9 steel and the bottom bar is AWS BAu-4.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
110
Poisson's Ratio 0.29
0.4
Shear Modulus, GPa 74
41
Tensile Strength: Ultimate (UTS), MPa 770 to 2030
200

Thermal Properties

Latent Heat of Fusion, J/g 280
100
Melting Completion (Liquidus), °C 1460
950
Melting Onset (Solidus), °C 1410
950
Specific Heat Capacity, J/kg-K 470
190
Thermal Expansion, µm/m-K 12
14

Otherwise Unclassified Properties

Density, g/cm3 7.8
17

Common Calculations

Stiffness to Weight: Axial, points 14
3.6
Stiffness to Weight: Bending, points 25
9.3
Strength to Weight: Axial, points 28 to 73
3.2
Strength to Weight: Bending, points 24 to 46
4.4
Thermal Shock Resistance, points 25 to 66
9.2

Alloy Composition


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Carbon (C), % 0.45 to 0.55
0
Chromium (Cr), % 4.8 to 5.5
0
Copper (Cu), % 0 to 0.25
0
Gold (Au), % 0
81.5 to 82.5
Iron (Fe), % 87 to 90.5
0
Manganese (Mn), % 0 to 0.5
0
Molybdenum (Mo), % 1.3 to 1.8
0
Nickel (Ni), % 1.3 to 1.8
17.4 to 18.5
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 1.0 to 1.2
0
Sulfur (S), % 0 to 0.030
0
Vanadium (V), % 0.8 to 1.4
0
Residuals, % 0
0 to 0.15