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SAE-AISI 1144 Steel vs. 2018 Aluminum

SAE-AISI 1144 steel belongs to the iron alloys classification, while 2018 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 1144 steel and the bottom bar is 2018 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220 to 230
120
Elastic (Young's, Tensile) Modulus, GPa 190
73
Elongation at Break, % 11 to 17
9.6
Fatigue Strength, MPa 280 to 430
120
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 72
27
Shear Strength, MPa 460 to 510
270
Tensile Strength: Ultimate (UTS), MPa 750 to 840
420
Tensile Strength: Yield (Proof), MPa 420 to 690
310

Thermal Properties

Latent Heat of Fusion, J/g 250
390
Maximum Temperature: Mechanical, °C 400
220
Melting Completion (Liquidus), °C 1450
640
Melting Onset (Solidus), °C 1410
510
Specific Heat Capacity, J/kg-K 470
870
Thermal Conductivity, W/m-K 51
150
Thermal Expansion, µm/m-K 13
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
40
Electrical Conductivity: Equal Weight (Specific), % IACS 8.2
120

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
11
Density, g/cm3 7.8
3.1
Embodied Carbon, kg CO2/kg material 1.4
8.1
Embodied Energy, MJ/kg 19
150
Embodied Water, L/kg 47
1130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 91 to 110
37
Resilience: Unit (Modulus of Resilience), kJ/m3 480 to 1290
670
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
45
Strength to Weight: Axial, points 27 to 30
38
Strength to Weight: Bending, points 23 to 25
41
Thermal Diffusivity, mm2/s 14
57
Thermal Shock Resistance, points 22 to 24
19

Alloy Composition

Aluminum (Al), % 0
89.7 to 94.4
Carbon (C), % 0.4 to 0.48
0
Chromium (Cr), % 0
0 to 0.1
Copper (Cu), % 0
3.5 to 4.5
Iron (Fe), % 97.5 to 98
0 to 1.0
Magnesium (Mg), % 0
0.45 to 0.9
Manganese (Mn), % 1.4 to 1.7
0 to 0.2
Nickel (Ni), % 0
1.7 to 2.3
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0
0 to 0.9
Sulfur (S), % 0.24 to 0.33
0
Zinc (Zn), % 0
0 to 0.25
Residuals, % 0
0 to 0.15