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SAE-AISI 1118 Steel vs. 2618 Aluminum

SAE-AISI 1118 steel belongs to the iron alloys classification, while 2618 aluminum belongs to the aluminum alloys. 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 1118 steel and the bottom bar is 2618 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
120
Elastic (Young's, Tensile) Modulus, GPa 190
71
Elongation at Break, % 13
5.8
Fatigue Strength, MPa 260
110
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 73
27
Shear Strength, MPa 300
260
Tensile Strength: Ultimate (UTS), MPa 490
420
Tensile Strength: Yield (Proof), MPa 410
350

Thermal Properties

Latent Heat of Fusion, J/g 250
390
Maximum Temperature: Mechanical, °C 400
210
Melting Completion (Liquidus), °C 1460
640
Melting Onset (Solidus), °C 1420
550
Specific Heat Capacity, J/kg-K 470
880
Thermal Conductivity, W/m-K 52
160
Thermal Expansion, µm/m-K 12
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.1
37
Electrical Conductivity: Equal Weight (Specific), % IACS 8.1
110

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
11
Density, g/cm3 7.8
2.9
Embodied Carbon, kg CO2/kg material 1.4
8.3
Embodied Energy, MJ/kg 19
150
Embodied Water, L/kg 47
1150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 61
23
Resilience: Unit (Modulus of Resilience), kJ/m3 450
850
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
47
Strength to Weight: Axial, points 17
40
Strength to Weight: Bending, points 18
42
Thermal Diffusivity, mm2/s 14
62
Thermal Shock Resistance, points 15
19

Alloy Composition

Aluminum (Al), % 0
92.4 to 94.9
Carbon (C), % 0.14 to 0.2
0
Copper (Cu), % 0
1.9 to 2.7
Iron (Fe), % 98 to 98.5
0.9 to 1.3
Magnesium (Mg), % 0
1.3 to 1.8
Manganese (Mn), % 1.3 to 1.6
0
Nickel (Ni), % 0
0.9 to 1.2
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0
0.1 to 0.25
Sulfur (S), % 0.080 to 0.13
0
Titanium (Ti), % 0
0.040 to 0.1
Zinc (Zn), % 0
0 to 0.1
Residuals, % 0
0 to 0.15