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ACI-ASTM CN3M Steel vs. 2218 Aluminum

ACI-ASTM CN3M 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 CN3M steel and the bottom bar is 2218 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
95 to 110
Elastic (Young's, Tensile) Modulus, GPa 200
73
Elongation at Break, % 34
6.8 to 10
Fatigue Strength, MPa 150
110
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 80
27
Tensile Strength: Ultimate (UTS), MPa 500
330 to 430
Tensile Strength: Yield (Proof), MPa 190
260 to 310

Thermal Properties

Latent Heat of Fusion, J/g 310
390
Maximum Temperature: Mechanical, °C 1100
220
Melting Completion (Liquidus), °C 1450
640
Melting Onset (Solidus), °C 1400
510
Specific Heat Capacity, J/kg-K 470
870
Thermal Conductivity, W/m-K 13
140
Thermal Expansion, µm/m-K 16
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.7
37
Electrical Conductivity: Equal Weight (Specific), % IACS 1.9
110

Otherwise Unclassified Properties

Base Metal Price, % relative 31
11
Density, g/cm3 8.1
3.1
Embodied Carbon, kg CO2/kg material 5.9
8.2
Embodied Energy, MJ/kg 80
150
Embodied Water, L/kg 200
1130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
27 to 31
Resilience: Unit (Modulus of Resilience), kJ/m3 89
450 to 650
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
45
Strength to Weight: Axial, points 17
30 to 39
Strength to Weight: Bending, points 17
34 to 41
Thermal Diffusivity, mm2/s 3.4
52
Thermal Shock Resistance, points 11
15 to 19

Alloy Composition

Aluminum (Al), % 0
88.8 to 93.6
Carbon (C), % 0 to 0.030
0
Chromium (Cr), % 20 to 22
0 to 0.1
Copper (Cu), % 0
3.5 to 4.5
Iron (Fe), % 42.4 to 52.5
0 to 1.0
Magnesium (Mg), % 0
1.2 to 1.8
Manganese (Mn), % 0 to 2.0
0 to 0.2
Molybdenum (Mo), % 4.5 to 5.5
0
Nickel (Ni), % 23 to 27
1.7 to 2.3
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0 to 1.0
0 to 0.9
Sulfur (S), % 0 to 0.030
0
Zinc (Zn), % 0
0 to 0.25
Residuals, % 0
0 to 0.15