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8021 Aluminum vs. EN 1.7390 Steel

8021 aluminum belongs to the aluminum alloys classification, while EN 1.7390 steel belongs to the iron alloys. There are 29 material properties with values for both materials. Properties with values for just one material (5, 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 EN 1.7390 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
190
Elongation at Break, % 2.3
16
Fatigue Strength, MPa 61
310
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
74
Tensile Strength: Ultimate (UTS), MPa 160
710
Tensile Strength: Yield (Proof), MPa 130
480

Thermal Properties

Latent Heat of Fusion, J/g 400
260
Maximum Temperature: Mechanical, °C 170
510
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
40
Thermal Expansion, µm/m-K 23
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 56
8.1
Electrical Conductivity: Equal Weight (Specific), % IACS 180
9.3

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
4.3
Density, g/cm3 2.8
7.8
Embodied Carbon, kg CO2/kg material 8.1
1.7
Embodied Energy, MJ/kg 150
23
Embodied Water, L/kg 1180
69

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 3.4
100
Resilience: Unit (Modulus of Resilience), kJ/m3 130
600
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 49
25
Strength to Weight: Axial, points 16
25
Strength to Weight: Bending, points 23
23
Thermal Diffusivity, mm2/s 88
11
Thermal Shock Resistance, points 7.0
20

Alloy Composition

Aluminum (Al), % 98 to 98.8
0
Carbon (C), % 0
0 to 0.18
Chromium (Cr), % 0
4.0 to 6.0
Copper (Cu), % 0 to 0.050
0
Iron (Fe), % 1.2 to 1.7
91.9 to 95.3
Manganese (Mn), % 0
0.3 to 0.8
Molybdenum (Mo), % 0
0.45 to 0.65
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0 to 0.15
0 to 0.4
Sulfur (S), % 0
0 to 0.015
Residuals, % 0 to 0.15
0