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ACI-ASTM CB6 Steel vs. 7020 Aluminum

ACI-ASTM CB6 steel belongs to the iron alloys classification, while 7020 aluminum belongs to the aluminum alloys. There are 29 material properties with values for both materials. Properties with values for just one material (5, 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 ACI-ASTM CB6 steel and the bottom bar is 7020 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
70
Elongation at Break, % 18
8.4 to 14
Fatigue Strength, MPa 410
110 to 130
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 77
26
Tensile Strength: Ultimate (UTS), MPa 880
190 to 390
Tensile Strength: Yield (Proof), MPa 660
120 to 310

Thermal Properties

Latent Heat of Fusion, J/g 280
380
Maximum Temperature: Mechanical, °C 870
210
Melting Completion (Liquidus), °C 1440
650
Melting Onset (Solidus), °C 1390
610
Specific Heat Capacity, J/kg-K 480
880
Thermal Conductivity, W/m-K 17
150
Thermal Expansion, µm/m-K 10
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
39
Electrical Conductivity: Equal Weight (Specific), % IACS 2.6
120

Otherwise Unclassified Properties

Base Metal Price, % relative 12
9.5
Density, g/cm3 7.8
2.9
Embodied Carbon, kg CO2/kg material 2.5
8.3
Embodied Energy, MJ/kg 36
150
Embodied Water, L/kg 130
1150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 150
23 to 46
Resilience: Unit (Modulus of Resilience), kJ/m3 1110
110 to 690
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
47
Strength to Weight: Axial, points 32
18 to 37
Strength to Weight: Bending, points 26
25 to 41
Thermal Diffusivity, mm2/s 4.6
59
Thermal Shock Resistance, points 31
8.3 to 17

Alloy Composition

Aluminum (Al), % 0
91.2 to 94.8
Carbon (C), % 0 to 0.060
0
Chromium (Cr), % 15.5 to 17.5
0.1 to 0.35
Copper (Cu), % 0
0 to 0.2
Iron (Fe), % 74.4 to 81
0 to 0.4
Magnesium (Mg), % 0
1.0 to 1.4
Manganese (Mn), % 0 to 1.0
0.050 to 0.5
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 3.5 to 5.5
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 0.35
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
0 to 0.25
Zinc (Zn), % 0
4.0 to 5.0
Zirconium (Zr), % 0
0.080 to 0.25
Residuals, % 0
0 to 0.15