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ACI-ASTM CG12 Steel vs. 2218 Aluminum

ACI-ASTM CG12 steel belongs to the iron alloys classification, while 2218 aluminum belongs to the aluminum 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 ACI-ASTM CG12 steel and the bottom bar is 2218 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
95 to 110
Elastic (Young's, Tensile) Modulus, GPa 200
73
Elongation at Break, % 40
6.8 to 10
Fatigue Strength, MPa 190
110
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 78
27
Tensile Strength: Ultimate (UTS), MPa 550
330 to 430
Tensile Strength: Yield (Proof), MPa 220
260 to 310

Thermal Properties

Latent Heat of Fusion, J/g 300
390
Maximum Temperature: Mechanical, °C 1040
220
Melting Completion (Liquidus), °C 1410
640
Melting Onset (Solidus), °C 1370
510
Specific Heat Capacity, J/kg-K 480
870
Thermal Conductivity, W/m-K 15
140
Thermal Expansion, µm/m-K 16
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.1
37
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
110

Otherwise Unclassified Properties

Base Metal Price, % relative 18
11
Density, g/cm3 7.8
3.1
Embodied Carbon, kg CO2/kg material 3.3
8.2
Embodied Energy, MJ/kg 48
150
Embodied Water, L/kg 160
1130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
27 to 31
Resilience: Unit (Modulus of Resilience), kJ/m3 120
450 to 650
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
45
Strength to Weight: Axial, points 20
30 to 39
Strength to Weight: Bending, points 19
34 to 41
Thermal Diffusivity, mm2/s 4.0
52
Thermal Shock Resistance, points 12
15 to 19

Alloy Composition

Aluminum (Al), % 0
88.8 to 93.6
Carbon (C), % 0 to 0.12
0
Chromium (Cr), % 20 to 23
0 to 0.1
Copper (Cu), % 0
3.5 to 4.5
Iron (Fe), % 60.3 to 70
0 to 1.0
Magnesium (Mg), % 0
1.2 to 1.8
Manganese (Mn), % 0 to 1.5
0 to 0.2
Nickel (Ni), % 10 to 13
1.7 to 2.3
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 2.0
0 to 0.9
Sulfur (S), % 0 to 0.040
0
Zinc (Zn), % 0
0 to 0.25
Residuals, % 0
0 to 0.15