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7021 Aluminum vs. ASTM A514 Steel

7021 aluminum belongs to the aluminum alloys classification, while ASTM A514 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 A514 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
190
Elongation at Break, % 9.4
18 to 21
Fatigue Strength, MPa 150
470 to 540
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 26
73
Shear Strength, MPa 270
490 to 520
Tensile Strength: Ultimate (UTS), MPa 460
790 to 830
Tensile Strength: Yield (Proof), MPa 390
690 to 770

Thermal Properties

Latent Heat of Fusion, J/g 380
250 to 260
Maximum Temperature: Mechanical, °C 200
400 to 440
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
37 to 51
Thermal Expansion, µm/m-K 24
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 38
7.2 to 7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 120
8.3 to 8.8

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
2.3 to 3.8
Density, g/cm3 2.9
7.8 to 7.9
Embodied Carbon, kg CO2/kg material 8.3
1.6 to 1.8
Embodied Energy, MJ/kg 150
21 to 25
Embodied Water, L/kg 1140
48 to 57

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 41
140 to 170
Resilience: Unit (Modulus of Resilience), kJ/m3 1110
1280 to 1590
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 47
24
Strength to Weight: Axial, points 44
28 to 29
Strength to Weight: Bending, points 45
24 to 25
Thermal Diffusivity, mm2/s 59
10 to 14
Thermal Shock Resistance, points 20
23 to 24