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7021 Aluminum vs. ASTM A203 Steel

7021 aluminum belongs to the aluminum alloys classification, while ASTM A203 steel belongs to the iron alloys. There are 30 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 7021 aluminum and the bottom bar is ASTM A203 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
190
Elongation at Break, % 9.4
22 to 26
Fatigue Strength, MPa 150
210 to 280
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 26
73
Shear Strength, MPa 270
330 to 370
Tensile Strength: Ultimate (UTS), MPa 460
520 to 590
Tensile Strength: Yield (Proof), MPa 390
290 to 390

Thermal Properties

Latent Heat of Fusion, J/g 380
250
Maximum Temperature: Mechanical, °C 200
410
Melting Completion (Liquidus), °C 630
1460
Melting Onset (Solidus), °C 510
1420
Specific Heat Capacity, J/kg-K 870
470
Thermal Conductivity, W/m-K 150
52
Thermal Expansion, µm/m-K 24
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 38
7.4 to 7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 120
8.5 to 8.7

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
3.2 to 4.0
Density, g/cm3 2.9
7.9
Embodied Carbon, kg CO2/kg material 8.3
1.6 to 1.7
Embodied Energy, MJ/kg 150
21 to 23
Embodied Water, L/kg 1140
50 to 52

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 41
110 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 1110
230 to 410
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 47
24
Strength to Weight: Axial, points 44
18 to 21
Strength to Weight: Bending, points 45
18 to 20
Thermal Diffusivity, mm2/s 59
14
Thermal Shock Resistance, points 20
15 to 17