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8021 Aluminum vs. ASTM A588 Steel

8021 aluminum belongs to the aluminum alloys classification, while ASTM A588 steel belongs to the iron alloys. There are 29 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 8021 aluminum and the bottom bar is ASTM A588 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
190
Elongation at Break, % 2.3
22
Fatigue Strength, MPa 61
270
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
73
Tensile Strength: Ultimate (UTS), MPa 160
550
Tensile Strength: Yield (Proof), MPa 130
390

Thermal Properties

Latent Heat of Fusion, J/g 400
250 to 260
Maximum Temperature: Mechanical, °C 170
410
Melting Completion (Liquidus), °C 650
1460
Melting Onset (Solidus), °C 640
1410 to 1420
Specific Heat Capacity, J/kg-K 900
470
Thermal Conductivity, W/m-K 220
43 to 44
Thermal Expansion, µm/m-K 23
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 56
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 180
8.5

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
2.3 to 2.5
Density, g/cm3 2.8
7.8
Embodied Carbon, kg CO2/kg material 8.1
1.5 to 1.6
Embodied Energy, MJ/kg 150
20 to 22
Embodied Water, L/kg 1180
50 to 51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 3.4
110
Resilience: Unit (Modulus of Resilience), kJ/m3 130
400
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 49
24
Strength to Weight: Axial, points 16
20
Strength to Weight: Bending, points 23
19
Thermal Diffusivity, mm2/s 88
12
Thermal Shock Resistance, points 7.0
16