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1080A Aluminum vs. ACI-ASTM CK20 Steel

1080A aluminum belongs to the aluminum alloys classification, while ACI-ASTM CK20 steel belongs to the iron alloys. There are 30 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 1080A aluminum and the bottom bar is ACI-ASTM CK20 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 18 to 40
150
Elastic (Young's, Tensile) Modulus, GPa 68
200
Elongation at Break, % 2.3 to 34
37
Fatigue Strength, MPa 18 to 50
220
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 26
78
Tensile Strength: Ultimate (UTS), MPa 74 to 140
530
Tensile Strength: Yield (Proof), MPa 17 to 120
260

Thermal Properties

Latent Heat of Fusion, J/g 400
310
Maximum Temperature: Mechanical, °C 170
1100
Melting Completion (Liquidus), °C 640
1400
Melting Onset (Solidus), °C 640
1430
Specific Heat Capacity, J/kg-K 900
480
Thermal Conductivity, W/m-K 230
14
Thermal Expansion, µm/m-K 23
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 62
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 200
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 160
62
Embodied Water, L/kg 1200
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 3.1 to 19
160
Resilience: Unit (Modulus of Resilience), kJ/m3 2.1 to 100
170
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
25
Strength to Weight: Axial, points 7.6 to 15
19
Strength to Weight: Bending, points 14 to 22
19
Thermal Diffusivity, mm2/s 94
3.7
Thermal Shock Resistance, points 3.3 to 6.4
13

Alloy Composition

Aluminum (Al), % 99.8 to 100
0
Carbon (C), % 0
0 to 0.2
Chromium (Cr), % 0
23 to 27
Copper (Cu), % 0 to 0.030
0
Gallium (Ga), % 0 to 0.030
0
Iron (Fe), % 0 to 0.15
46.7 to 58
Magnesium (Mg), % 0 to 0.020
0
Manganese (Mn), % 0 to 0.020
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 to 0.15
0 to 2.0
Sulfur (S), % 0
0 to 0.040
Titanium (Ti), % 0 to 0.020
0
Zinc (Zn), % 0 to 0.060
0