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SAE-AISI A9 Steel vs. A390.0 Aluminum

SAE-AISI A9 steel belongs to the iron alloys classification, while A390.0 aluminum belongs to the aluminum alloys. There are 23 material properties with values for both materials. Properties with values for just one material (8, 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 A390.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
75
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 74
28
Tensile Strength: Ultimate (UTS), MPa 770 to 2030
190 to 290

Thermal Properties

Latent Heat of Fusion, J/g 280
640
Melting Completion (Liquidus), °C 1460
580
Melting Onset (Solidus), °C 1410
480
Specific Heat Capacity, J/kg-K 470
880
Thermal Conductivity, W/m-K 35
130
Thermal Expansion, µm/m-K 12
20

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.9
20
Electrical Conductivity: Equal Weight (Specific), % IACS 9.2
67

Otherwise Unclassified Properties

Base Metal Price, % relative 7.0
11
Density, g/cm3 7.8
2.7
Embodied Carbon, kg CO2/kg material 4.7
7.3
Embodied Energy, MJ/kg 70
140
Embodied Water, L/kg 82
950

Common Calculations

Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
52
Strength to Weight: Axial, points 28 to 73
19 to 30
Strength to Weight: Bending, points 24 to 46
27 to 36
Thermal Diffusivity, mm2/s 9.6
56
Thermal Shock Resistance, points 25 to 66
9.0 to 14

Alloy Composition


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Aluminum (Al), % 0
75.3 to 79.6
Carbon (C), % 0.45 to 0.55
0
Chromium (Cr), % 4.8 to 5.5
0
Copper (Cu), % 0 to 0.25
4.0 to 5.0
Iron (Fe), % 87 to 90.5
0 to 0.5
Magnesium (Mg), % 0
0.45 to 0.65
Manganese (Mn), % 0 to 0.5
0 to 0.1
Molybdenum (Mo), % 1.3 to 1.8
0
Nickel (Ni), % 1.3 to 1.8
0
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 1.0 to 1.2
16 to 18
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
0 to 0.2
Vanadium (V), % 0.8 to 1.4
0
Zinc (Zn), % 0
0 to 0.1
Residuals, % 0
0 to 0.2