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SAE-AISI 1140 Steel vs. 4006 Aluminum

SAE-AISI 1140 steel belongs to the iron alloys classification, while 4006 aluminum belongs to the aluminum 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 SAE-AISI 1140 steel and the bottom bar is 4006 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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