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6081 Aluminum vs. ACI-ASTM CK20 Steel

6081 aluminum belongs to the aluminum alloys classification, while ACI-ASTM CK20 steel belongs to the iron 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 6081 aluminum and the bottom bar is ACI-ASTM CK20 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
200
Elongation at Break, % 9.0
37
Fatigue Strength, MPa 110
220
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 26
78
Tensile Strength: Ultimate (UTS), MPa 310
530
Tensile Strength: Yield (Proof), MPa 270
260

Thermal Properties

Latent Heat of Fusion, J/g 410
310
Maximum Temperature: Mechanical, °C 160
1100
Melting Completion (Liquidus), °C 640
1400
Melting Onset (Solidus), °C 610
1430
Specific Heat Capacity, J/kg-K 900
480
Thermal Conductivity, W/m-K 180
14
Thermal Expansion, µm/m-K 23
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 47
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 160
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
25
Density, g/cm3 2.7
7.8
Embodied Carbon, kg CO2/kg material 8.3
4.4
Embodied Energy, MJ/kg 150
62
Embodied Water, L/kg 1180
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 27
160
Resilience: Unit (Modulus of Resilience), kJ/m3 540
170
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
25
Strength to Weight: Axial, points 32
19
Strength to Weight: Bending, points 37
19
Thermal Diffusivity, mm2/s 74
3.7
Thermal Shock Resistance, points 14
13

Alloy Composition

Aluminum (Al), % 96.3 to 98.6
0
Carbon (C), % 0
0 to 0.2
Chromium (Cr), % 0 to 0.1
23 to 27
Copper (Cu), % 0 to 0.1
0
Iron (Fe), % 0 to 0.5
46.7 to 58
Magnesium (Mg), % 0.6 to 1.0
0
Manganese (Mn), % 0.1 to 0.45
0 to 2.0
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0
19 to 22
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0.7 to 1.1
0 to 2.0
Sulfur (S), % 0
0 to 0.040
Titanium (Ti), % 0 to 0.15
0
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.15
0