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4006 Aluminum vs. SAE-AISI 1140 Steel

4006 aluminum belongs to the aluminum alloys classification, while SAE-AISI 1140 steel belongs to the iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (1, 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 4006 aluminum and the bottom bar is SAE-AISI 1140 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 28 to 45
170 to 180
Elastic (Young's, Tensile) Modulus, GPa 69
190
Elongation at Break, % 3.4 to 24
14 to 18
Fatigue Strength, MPa 35 to 110
230 to 370
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
72
Shear Strength, MPa 70 to 91
370 to 420
Tensile Strength: Ultimate (UTS), MPa 110 to 160
600 to 700
Tensile Strength: Yield (Proof), MPa 62 to 140
340 to 570

Thermal Properties

Latent Heat of Fusion, J/g 410
250
Maximum Temperature: Mechanical, °C 160
400
Melting Completion (Liquidus), °C 640
1460
Melting Onset (Solidus), °C 620
1420
Specific Heat Capacity, J/kg-K 900
470
Thermal Conductivity, W/m-K 220
51
Thermal Expansion, µm/m-K 23
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 56
7.0
Electrical Conductivity: Equal Weight (Specific), % IACS 180
8.1

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
1.8
Density, g/cm3 2.7
7.8
Embodied Carbon, kg CO2/kg material 8.1
1.4
Embodied Energy, MJ/kg 150
18
Embodied Water, L/kg 1180
46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 5.1 to 26
89 to 93
Resilience: Unit (Modulus of Resilience), kJ/m3 28 to 130
310 to 870
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 50
24
Strength to Weight: Axial, points 11 to 16
21 to 25
Strength to Weight: Bending, points 19 to 24
20 to 22
Thermal Diffusivity, mm2/s 89
14
Thermal Shock Resistance, points 4.9 to 7.0
18 to 21

Alloy Composition

Aluminum (Al), % 97.4 to 98.7
0
Carbon (C), % 0
0.37 to 0.44
Chromium (Cr), % 0 to 0.2
0
Copper (Cu), % 0 to 0.1
0
Iron (Fe), % 0.5 to 0.8
98.4 to 98.9
Magnesium (Mg), % 0 to 0.010
0
Manganese (Mn), % 0 to 0.050
0.7 to 1.0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0.8 to 1.2
0
Sulfur (S), % 0
0.080 to 0.13
Zinc (Zn), % 0 to 0.050
0
Residuals, % 0 to 0.15
0