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7050 Aluminum vs. ASTM A588 Steel

7050 aluminum belongs to the aluminum alloys classification, while ASTM A588 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 7050 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, % 2.2 to 12
22
Fatigue Strength, MPa 130 to 210
270
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 26
73
Shear Strength, MPa 280 to 330
350
Tensile Strength: Ultimate (UTS), MPa 490 to 570
550
Tensile Strength: Yield (Proof), MPa 390 to 500
390

Thermal Properties

Latent Heat of Fusion, J/g 370
250 to 260
Maximum Temperature: Mechanical, °C 190
410
Melting Completion (Liquidus), °C 630
1460
Melting Onset (Solidus), °C 490
1410 to 1420
Specific Heat Capacity, J/kg-K 860
470
Thermal Conductivity, W/m-K 140
43 to 44
Thermal Expansion, µm/m-K 24
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 35
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 100
8.5

Otherwise Unclassified Properties

Base Metal Price, % relative 10
2.3 to 2.5
Density, g/cm3 3.1
7.8
Embodied Carbon, kg CO2/kg material 8.2
1.5 to 1.6
Embodied Energy, MJ/kg 150
20 to 22
Embodied Water, L/kg 1120
50 to 51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 10 to 55
110
Resilience: Unit (Modulus of Resilience), kJ/m3 1110 to 1760
400
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 45
24
Strength to Weight: Axial, points 45 to 51
20
Strength to Weight: Bending, points 45 to 50
19
Thermal Diffusivity, mm2/s 54
12
Thermal Shock Resistance, points 21 to 25
16