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8021 Aluminum vs. ACI-ASTM CB30 Steel

8021 aluminum belongs to the aluminum alloys classification, while ACI-ASTM CB30 steel belongs to the iron alloys. There are 26 material properties with values for both materials. Properties with values for just one material (6, 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 8021 aluminum and the bottom bar is ACI-ASTM CB30 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
200
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 26
77
Tensile Strength: Ultimate (UTS), MPa 160
500
Tensile Strength: Yield (Proof), MPa 130
230

Thermal Properties

Latent Heat of Fusion, J/g 400
290
Maximum Temperature: Mechanical, °C 170
940
Melting Completion (Liquidus), °C 650
1430
Melting Onset (Solidus), °C 640
1380
Specific Heat Capacity, J/kg-K 900
480
Thermal Conductivity, W/m-K 220
21
Thermal Expansion, µm/m-K 23
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 56
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 180
3.0

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
10
Density, g/cm3 2.8
7.7
Embodied Carbon, kg CO2/kg material 8.1
2.3
Embodied Energy, MJ/kg 150
33
Embodied Water, L/kg 1180
130

Common Calculations

Resilience: Unit (Modulus of Resilience), kJ/m3 130
140
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 49
25
Strength to Weight: Axial, points 16
18
Strength to Weight: Bending, points 23
18
Thermal Diffusivity, mm2/s 88
5.6
Thermal Shock Resistance, points 7.0
17

Alloy Composition


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Aluminum (Al), % 98 to 98.8
0
Carbon (C), % 0
0 to 0.3
Chromium (Cr), % 0
18 to 21
Copper (Cu), % 0 to 0.050
0 to 1.2
Iron (Fe), % 1.2 to 1.7
72.9 to 82
Manganese (Mn), % 0
0 to 1.0
Nickel (Ni), % 0
0 to 2.0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.15
0 to 1.5
Sulfur (S), % 0
0 to 0.040
Residuals, % 0 to 0.15
0