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7129 Aluminum vs. ASTM A588 Steel

7129 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 7129 Aluminum and the bottom bar is ASTM A588 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
190
Elongation at Break, % 9.0 to 9.1
22
Fatigue Strength, MPa 150 to 190
270
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
73
Shear Strength, MPa 250 to 260
350
Tensile Strength: Ultimate (UTS), MPa 430
550
Tensile Strength: Yield (Proof), MPa 380 to 390
390

Thermal Properties

Latent Heat of Fusion, J/g 380
250 to 260
Maximum Temperature: Mechanical, °C 180
410
Melting Completion (Liquidus), °C 630
1460
Melting Onset (Solidus), °C 510
1410 to 1420
Specific Heat Capacity, J/kg-K 880
470
Thermal Conductivity, W/m-K 150
43 to 44
Thermal Expansion, µm/m-K 24
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 120
8.5

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
2.3 to 2.5
Density, g/cm3 2.9
7.8
Embodied Carbon, kg CO2/kg material 8.3
1.5 to 1.6
Embodied Energy, MJ/kg 150
20 to 22
Embodied Water, L/kg 1150
50 to 51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 37 to 38
110
Resilience: Unit (Modulus of Resilience), kJ/m3 1050 to 1090
400
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 47
24
Strength to Weight: Axial, points 41
20
Strength to Weight: Bending, points 43 to 44
19
Thermal Diffusivity, mm2/s 58
12
Thermal Shock Resistance, points 19
16