SAE-AISI 1108 Steel vs. 2218 Aluminum
SAE-AISI 1108 steel belongs to the iron alloys classification, while 2218 aluminum belongs to the aluminum alloys. There are 31 material properties with values for both materials. Properties with values for just one material (1, 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 SAE-AISI 1108 steel and the bottom bar is 2218 aluminum.
Metric UnitsUS Customary Units
Mechanical Properties
Brinell Hardness | 110 to 140 | |
95 to 110 |
Elastic (Young's, Tensile) Modulus, GPa | 190 | |
73 |
Elongation at Break, % | 23 to 34 | |
6.8 to 10 |
Fatigue Strength, MPa | 170 to 260 | |
110 |
Poisson's Ratio | 0.29 | |
0.33 |
Shear Modulus, GPa | 73 | |
27 |
Shear Strength, MPa | 250 to 280 | |
210 to 250 |
Tensile Strength: Ultimate (UTS), MPa | 380 to 440 | |
330 to 430 |
Tensile Strength: Yield (Proof), MPa | 220 to 360 | |
260 to 310 |
Thermal Properties
Latent Heat of Fusion, J/g | 250 | |
390 |
Maximum Temperature: Mechanical, °C | 400 | |
220 |
Melting Completion (Liquidus), °C | 1460 | |
640 |
Melting Onset (Solidus), °C | 1420 | |
510 |
Specific Heat Capacity, J/kg-K | 470 | |
870 |
Thermal Conductivity, W/m-K | 52 | |
140 |
Thermal Expansion, µm/m-K | 12 | |
22 |
Electrical Properties
Electrical Conductivity: Equal Volume, % IACS | 7.0 | |
37 |
Electrical Conductivity: Equal Weight (Specific), % IACS | 8.0 | |
110 |
Otherwise Unclassified Properties
Base Metal Price, % relative | 1.8 | |
11 |
Density, g/cm3 | 7.9 | |
3.1 |
Embodied Carbon, kg CO2/kg material | 1.4 | |
8.2 |
Embodied Energy, MJ/kg | 18 | |
150 |
Embodied Water, L/kg | 46 | |
1130 |
Common Calculations
Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 95 to 110 | |
27 to 31 |
Resilience: Unit (Modulus of Resilience), kJ/m3 | 130 to 340 | |
450 to 650 |
Stiffness to Weight: Axial, points | 13 | |
13 |
Stiffness to Weight: Bending, points | 24 | |
45 |
Strength to Weight: Axial, points | 13 to 16 | |
30 to 39 |
Strength to Weight: Bending, points | 15 to 16 | |
34 to 41 |
Thermal Diffusivity, mm2/s | 14 | |
52 |
Thermal Shock Resistance, points | 12 to 14 | |
15 to 19 |
Alloy Composition
Aluminum (Al), % | 0 | |
88.8 to 93.6 |
Carbon (C), % | 0.080 to 0.13 | |
0 |
Chromium (Cr), % | 0 | |
0 to 0.1 |
Copper (Cu), % | 0 | |
3.5 to 4.5 |
Iron (Fe), % | 98.9 to 99.24 | |
0 to 1.0 |
Magnesium (Mg), % | 0 | |
1.2 to 1.8 |
Manganese (Mn), % | 0.6 to 0.8 | |
0 to 0.2 |
Nickel (Ni), % | 0 | |
1.7 to 2.3 |
Phosphorus (P), % | 0 to 0.040 | |
0 |
Silicon (Si), % | 0 | |
0 to 0.9 |
Sulfur (S), % | 0.080 to 0.13 | |
0 |
Zinc (Zn), % | 0 | |
0 to 0.25 |
Residuals, % | 0 | |
0 to 0.15 |