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SAE-AISI A4 Steel vs. EN AC-44400 Aluminum

SAE-AISI A4 steel belongs to the iron alloys classification, while EN AC-44400 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 A4 steel and the bottom bar is EN AC-44400 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
71
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 73
27
Tensile Strength: Ultimate (UTS), MPa 710 to 2050
210

Thermal Properties

Latent Heat of Fusion, J/g 250
540
Melting Completion (Liquidus), °C 1450
600
Melting Onset (Solidus), °C 1410
590
Specific Heat Capacity, J/kg-K 470
900
Thermal Conductivity, W/m-K 40
140
Thermal Expansion, µm/m-K 12
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
33
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
110

Otherwise Unclassified Properties

Base Metal Price, % relative 3.9
9.5
Density, g/cm3 7.8
2.6
Embodied Carbon, kg CO2/kg material 1.8
7.8
Embodied Energy, MJ/kg 24
150
Embodied Water, L/kg 59
1080

Common Calculations

Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 24
54
Strength to Weight: Axial, points 25 to 73
23
Strength to Weight: Bending, points 23 to 46
31
Thermal Diffusivity, mm2/s 11
60
Thermal Shock Resistance, points 23 to 67
9.8

Alloy Composition

Aluminum (Al), % 0
87.1 to 92
Carbon (C), % 1.0 to 1.1
0
Chromium (Cr), % 0.9 to 2.2
0
Copper (Cu), % 0 to 0.25
0 to 0.1
Iron (Fe), % 92 to 95.5
0 to 0.65
Lead (Pb), % 0
0 to 0.050
Magnesium (Mg), % 0
0 to 0.1
Manganese (Mn), % 1.8 to 2.2
0 to 0.5
Molybdenum (Mo), % 0.9 to 1.4
0
Nickel (Ni), % 0 to 0.3
0 to 0.050
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0 to 0.5
8.0 to 11
Sulfur (S), % 0 to 0.030
0
Tin (Sn), % 0
0 to 0.050
Titanium (Ti), % 0
0 to 0.15
Zinc (Zn), % 0
0 to 0.15
Residuals, % 0
0 to 0.15