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6066 Aluminum vs. S39274 Stainless Steel

6066 aluminum belongs to the aluminum alloys classification, while S39274 stainless steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (5, 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 6066 aluminum and the bottom bar is S39274 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
210
Elongation at Break, % 7.8 to 17
17
Fatigue Strength, MPa 94 to 130
380
Poisson's Ratio 0.33
0.27
Shear Modulus, GPa 26
81
Shear Strength, MPa 95 to 240
560
Tensile Strength: Ultimate (UTS), MPa 160 to 400
900
Tensile Strength: Yield (Proof), MPa 93 to 360
620

Thermal Properties

Latent Heat of Fusion, J/g 410
300
Maximum Temperature: Mechanical, °C 170
1100
Melting Completion (Liquidus), °C 650
1480
Melting Onset (Solidus), °C 560
1430
Specific Heat Capacity, J/kg-K 890
470
Thermal Conductivity, W/m-K 150
16
Thermal Expansion, µm/m-K 23
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 130
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
24
Density, g/cm3 2.8
8.0
Embodied Carbon, kg CO2/kg material 8.3
4.3
Embodied Energy, MJ/kg 150
60
Embodied Water, L/kg 1160
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 23 to 52
140
Resilience: Unit (Modulus of Resilience), kJ/m3 61 to 920
940
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 49
25
Strength to Weight: Axial, points 16 to 39
32
Strength to Weight: Bending, points 23 to 43
26
Thermal Diffusivity, mm2/s 61
4.2
Thermal Shock Resistance, points 6.9 to 17
25

Alloy Composition

Aluminum (Al), % 93 to 97
0
Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0 to 0.4
24 to 26
Copper (Cu), % 0.7 to 1.2
0.2 to 0.8
Iron (Fe), % 0 to 0.5
57 to 65.6
Magnesium (Mg), % 0.8 to 1.4
0
Manganese (Mn), % 0.6 to 1.1
0 to 1.0
Molybdenum (Mo), % 0
2.5 to 3.5
Nickel (Ni), % 0
6.0 to 8.0
Nitrogen (N), % 0
0.24 to 0.32
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0.9 to 1.8
0 to 0.8
Sulfur (S), % 0
0 to 0.020
Titanium (Ti), % 0 to 0.2
0
Tungsten (W), % 0
1.5 to 2.5
Zinc (Zn), % 0 to 0.25
0
Residuals, % 0 to 0.15
0