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7075 Aluminum vs. ASTM A216 Cast Steel

7075 aluminum belongs to the aluminum alloys classification, while ASTM A216 cast steel belongs to the iron 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 7075 aluminum and the bottom bar is ASTM A216 cast steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
190
Elongation at Break, % 1.8 to 12
25 to 27
Fatigue Strength, MPa 110 to 190
170 to 230
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 26
72
Tensile Strength: Ultimate (UTS), MPa 240 to 590
500 to 570
Tensile Strength: Yield (Proof), MPa 120 to 510
230 to 310

Thermal Properties

Latent Heat of Fusion, J/g 380
250
Maximum Temperature: Mechanical, °C 200
400
Melting Completion (Liquidus), °C 640
1450 to 1460
Melting Onset (Solidus), °C 480
1410
Specific Heat Capacity, J/kg-K 870
470
Thermal Conductivity, W/m-K 130
49 to 52
Thermal Expansion, µm/m-K 23
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 33
7.1 to 7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 98
8.2 to 8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 10
1.8
Density, g/cm3 3.0
7.8
Embodied Carbon, kg CO2/kg material 8.3
1.4
Embodied Energy, MJ/kg 150
18
Embodied Water, L/kg 1120
45

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.8 to 44
110 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 1870
140 to 250
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 46
24
Strength to Weight: Axial, points 22 to 54
18 to 20
Strength to Weight: Bending, points 28 to 52
18 to 20
Thermal Diffusivity, mm2/s 50
13 to 14
Thermal Shock Resistance, points 10 to 25
16 to 18