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SAE-AISI 1140 Steel vs. 6012 Aluminum

SAE-AISI 1140 steel belongs to the iron alloys classification, while 6012 aluminum belongs to the aluminum alloys. There are 30 material properties with values for both materials. Properties with values for just one material (2, 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 6012 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
69
Elongation at Break, % 14 to 18
9.1 to 11
Fatigue Strength, MPa 230 to 370
55 to 100
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 72
26
Shear Strength, MPa 370 to 420
130 to 190
Tensile Strength: Ultimate (UTS), MPa 600 to 700
220 to 320
Tensile Strength: Yield (Proof), MPa 340 to 570
110 to 260

Thermal Properties

Latent Heat of Fusion, J/g 250
400
Maximum Temperature: Mechanical, °C 400
170
Melting Completion (Liquidus), °C 1460
640
Melting Onset (Solidus), °C 1420
570
Specific Heat Capacity, J/kg-K 470
890
Thermal Conductivity, W/m-K 51
160
Thermal Expansion, µm/m-K 13
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.0
45
Electrical Conductivity: Equal Weight (Specific), % IACS 8.1
140

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
9.5
Density, g/cm3 7.8
2.9
Embodied Carbon, kg CO2/kg material 1.4
8.2
Embodied Energy, MJ/kg 18
150
Embodied Water, L/kg 46
1170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 89 to 93
21 to 28
Resilience: Unit (Modulus of Resilience), kJ/m3 310 to 870
94 to 480
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
48
Strength to Weight: Axial, points 21 to 25
22 to 32
Strength to Weight: Bending, points 20 to 22
29 to 37
Thermal Diffusivity, mm2/s 14
62
Thermal Shock Resistance, points 18 to 21
10 to 14

Alloy Composition

Aluminum (Al), % 0
92.2 to 98
Bismuth (Bi), % 0
0 to 0.7
Carbon (C), % 0.37 to 0.44
0
Chromium (Cr), % 0
0 to 0.3
Copper (Cu), % 0
0 to 0.1
Iron (Fe), % 98.4 to 98.9
0 to 0.5
Lead (Pb), % 0
0.4 to 2.0
Magnesium (Mg), % 0
0.6 to 1.2
Manganese (Mn), % 0.7 to 1.0
0.4 to 1.0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0
0.6 to 1.4
Sulfur (S), % 0.080 to 0.13
0
Titanium (Ti), % 0
0 to 0.2
Zinc (Zn), % 0
0 to 0.3
Residuals, % 0
0 to 0.15