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8021 Aluminum vs. SAE-AISI 1018 Steel

8021 aluminum belongs to the aluminum alloys classification, while SAE-AISI 1018 steel belongs to the iron alloys. There are 29 material properties with values for both materials. Properties with values for just one material (3, 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 8021 aluminum and the bottom bar is SAE-AISI 1018 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
190
Elongation at Break, % 2.3
17 to 27
Fatigue Strength, MPa 61
180 to 270
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
73
Tensile Strength: Ultimate (UTS), MPa 160
430 to 480
Tensile Strength: Yield (Proof), MPa 130
240 to 400

Thermal Properties

Latent Heat of Fusion, J/g 400
250
Maximum Temperature: Mechanical, °C 170
400
Melting Completion (Liquidus), °C 650
1460
Melting Onset (Solidus), °C 640
1420
Specific Heat Capacity, J/kg-K 900
470
Thermal Conductivity, W/m-K 220
52
Thermal Expansion, µm/m-K 23
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 56
7.0
Electrical Conductivity: Equal Weight (Specific), % IACS 180
8.0

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
1.8
Density, g/cm3 2.8
7.9
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 3.4
75 to 100
Resilience: Unit (Modulus of Resilience), kJ/m3 130
150 to 430
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 49
24
Strength to Weight: Axial, points 16
15 to 17
Strength to Weight: Bending, points 23
16 to 17
Thermal Diffusivity, mm2/s 88
14
Thermal Shock Resistance, points 7.0
14 to 15

Alloy Composition

Aluminum (Al), % 98 to 98.8
0
Carbon (C), % 0
0.15 to 0.2
Copper (Cu), % 0 to 0.050
0
Iron (Fe), % 1.2 to 1.7
98.8 to 99.25
Manganese (Mn), % 0
0.6 to 0.9
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.15
0
Sulfur (S), % 0
0 to 0.050
Residuals, % 0 to 0.15
0