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ACI-ASTM CK20 Steel vs. 2030 Aluminum

ACI-ASTM CK20 steel belongs to the iron alloys classification, while 2030 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 CK20 steel and the bottom bar is 2030 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
70
Elongation at Break, % 37
5.6 to 8.0
Fatigue Strength, MPa 220
91 to 110
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 78
26
Tensile Strength: Ultimate (UTS), MPa 530
370 to 420
Tensile Strength: Yield (Proof), MPa 260
240 to 270

Thermal Properties

Latent Heat of Fusion, J/g 310
390
Maximum Temperature: Mechanical, °C 1100
190
Melting Completion (Liquidus), °C 1400
640
Melting Onset (Solidus), °C 1430
510
Specific Heat Capacity, J/kg-K 480
870
Thermal Conductivity, W/m-K 14
130
Thermal Expansion, µm/m-K 15
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
34
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
99

Otherwise Unclassified Properties

Base Metal Price, % relative 25
10
Density, g/cm3 7.8
3.1
Embodied Carbon, kg CO2/kg material 4.4
8.0
Embodied Energy, MJ/kg 62
150
Embodied Water, L/kg 190
1140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 160
21 to 26
Resilience: Unit (Modulus of Resilience), kJ/m3 170
390 to 530
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
45
Strength to Weight: Axial, points 19
33 to 38
Strength to Weight: Bending, points 19
37 to 40
Thermal Diffusivity, mm2/s 3.7
50
Thermal Shock Resistance, points 13
16 to 19

Alloy Composition

Aluminum (Al), % 0
88.9 to 95.2
Bismuth (Bi), % 0
0 to 0.2
Carbon (C), % 0 to 0.2
0
Chromium (Cr), % 23 to 27
0 to 0.1
Copper (Cu), % 0
3.3 to 4.5
Iron (Fe), % 46.7 to 58
0 to 0.7
Lead (Pb), % 0
0.8 to 1.5
Magnesium (Mg), % 0
0.5 to 1.3
Manganese (Mn), % 0 to 2.0
0.2 to 1.0
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 19 to 22
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 2.0
0 to 0.8
Sulfur (S), % 0 to 0.040
0
Titanium (Ti), % 0
0 to 0.2
Zinc (Zn), % 0
0 to 0.5
Residuals, % 0
0 to 0.3