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ASTM A148 Cast Steel vs. 7021 Aluminum

ASTM A148 cast steel belongs to the iron alloys classification, while 7021 aluminum belongs to the aluminum alloys. There are 29 material properties with values for both materials. Properties with values for just one material (3, 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 ASTM A148 cast steel and the bottom bar is 7021 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
69
Elongation at Break, % 5.7 to 25
9.4
Fatigue Strength, MPa 280 to 670
150
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 73
26
Tensile Strength: Ultimate (UTS), MPa 630 to 1300
460
Tensile Strength: Yield (Proof), MPa 390 to 1160
390

Thermal Properties

Latent Heat of Fusion, J/g 250
380
Maximum Temperature: Mechanical, °C 400 to 430
200
Melting Completion (Liquidus), °C 1460
630
Melting Onset (Solidus), °C 1420
510
Specific Heat Capacity, J/kg-K 470
870
Thermal Conductivity, W/m-K 37 to 47
150
Thermal Expansion, µm/m-K 13
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3 to 7.5
38
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3 to 8.6
120

Otherwise Unclassified Properties

Base Metal Price, % relative 2.3 to 3.3
9.5
Density, g/cm3 7.8
2.9
Embodied Carbon, kg CO2/kg material 1.5 to 1.7
8.3
Embodied Energy, MJ/kg 20 to 22
150
Embodied Water, L/kg 48 to 53
1140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 71 to 150
41
Resilience: Unit (Modulus of Resilience), kJ/m3 400 to 3570
1110
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
47
Strength to Weight: Axial, points 22 to 46
44
Strength to Weight: Bending, points 21 to 34
45
Thermal Diffusivity, mm2/s 9.9 to 13
59
Thermal Shock Resistance, points 18 to 38
20