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ACI-ASTM CH20 Steel vs. 5021 Aluminum

ACI-ASTM CH20 steel belongs to the iron alloys classification, while 5021 aluminum belongs to the aluminum alloys. There are 29 material properties with values for both materials. Properties with values for just one material (4, 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 CH20 steel and the bottom bar is 5021 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
68
Elongation at Break, % 38
1.1 to 3.4
Fatigue Strength, MPa 290
85 to 110
Poisson's Ratio 0.27
0.33
Shear Modulus, GPa 78
26
Tensile Strength: Ultimate (UTS), MPa 610
300 to 310
Tensile Strength: Yield (Proof), MPa 350
240 to 270

Thermal Properties

Latent Heat of Fusion, J/g 310
400
Maximum Temperature: Mechanical, °C 1100
180
Melting Completion (Liquidus), °C 1410
640
Melting Onset (Solidus), °C 1430
590
Specific Heat Capacity, J/kg-K 480
900
Thermal Conductivity, W/m-K 14
140
Thermal Expansion, µm/m-K 15
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
35
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
120

Otherwise Unclassified Properties

Base Metal Price, % relative 20
9.5
Density, g/cm3 7.8
2.7
Embodied Carbon, kg CO2/kg material 3.7
8.6
Embodied Energy, MJ/kg 53
150
Embodied Water, L/kg 180
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200
3.1 to 10
Resilience: Unit (Modulus of Resilience), kJ/m3 300
440 to 550
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
50
Strength to Weight: Axial, points 22
30 to 32
Strength to Weight: Bending, points 21
37
Thermal Diffusivity, mm2/s 3.7
57
Thermal Shock Resistance, points 15
13 to 14

Alloy Composition

Aluminum (Al), % 0
95.2 to 97.7
Carbon (C), % 0 to 0.2
0
Chromium (Cr), % 22 to 26
0 to 0.15
Copper (Cu), % 0
0 to 0.15
Iron (Fe), % 54.7 to 66
0 to 0.5
Magnesium (Mg), % 0
2.2 to 2.8
Manganese (Mn), % 0 to 1.5
0.1 to 0.5
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 12 to 15
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 2.0
0 to 0.4
Sulfur (S), % 0 to 0.040
0
Zinc (Zn), % 0
0 to 0.15
Residuals, % 0
0 to 0.15