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SAE-AISI P21 Steel vs. 2618A Aluminum

SAE-AISI P21 steel belongs to the iron alloys classification, while 2618A aluminum belongs to the aluminum alloys. There are 23 material properties with values for both materials. Properties with values for just one material (8, 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 P21 steel and the bottom bar is 2618A aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
72
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 73
27
Tensile Strength: Ultimate (UTS), MPa 1130
440

Thermal Properties

Latent Heat of Fusion, J/g 250
390
Melting Completion (Liquidus), °C 1450
670
Melting Onset (Solidus), °C 1410
560
Specific Heat Capacity, J/kg-K 470
880
Thermal Conductivity, W/m-K 41
150
Thermal Expansion, µm/m-K 12
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.9
37
Electrical Conductivity: Equal Weight (Specific), % IACS 9.0
110

Otherwise Unclassified Properties

Base Metal Price, % relative 6.5
11
Density, g/cm3 7.9
3.0
Embodied Carbon, kg CO2/kg material 2.3
8.4
Embodied Energy, MJ/kg 32
150
Embodied Water, L/kg 62
1150

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
47
Strength to Weight: Axial, points 40
41
Strength to Weight: Bending, points 31
44
Thermal Diffusivity, mm2/s 11
59
Thermal Shock Resistance, points 37
19

Alloy Composition

Aluminum (Al), % 0
91.5 to 95.2
Carbon (C), % 0.18 to 0.22
0
Chromium (Cr), % 0 to 0.5
0
Cobalt (Co), % 1.1 to 1.3
0
Copper (Cu), % 0 to 0.25
1.8 to 2.7
Iron (Fe), % 92.1 to 94.2
0.9 to 1.4
Magnesium (Mg), % 0
1.2 to 1.8
Manganese (Mn), % 0.35 to 0.72
0 to 0.25
Nickel (Ni), % 3.9 to 4.3
0.8 to 1.4
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0.2 to 0.4
0.15 to 0.25
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
0 to 0.2
Vanadium (V), % 0.15 to 0.25
0
Zinc (Zn), % 0
0 to 0.15
Zirconium (Zr), % 0
0 to 0.25
Residuals, % 0
0 to 0.15