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6066 Aluminum vs. S35140 Stainless Steel

6066 aluminum belongs to the aluminum alloys classification, while S35140 stainless steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (4, 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 S35140 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
200
Elongation at Break, % 7.8 to 17
34
Fatigue Strength, MPa 94 to 130
250
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 26
78
Shear Strength, MPa 95 to 240
460
Tensile Strength: Ultimate (UTS), MPa 160 to 400
690
Tensile Strength: Yield (Proof), MPa 93 to 360
310

Thermal Properties

Latent Heat of Fusion, J/g 410
300
Maximum Temperature: Mechanical, °C 170
1100
Melting Completion (Liquidus), °C 650
1420
Melting Onset (Solidus), °C 560
1370
Specific Heat Capacity, J/kg-K 890
470
Thermal Conductivity, W/m-K 150
14
Thermal Expansion, µm/m-K 23
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 130
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
31
Density, g/cm3 2.8
8.0
Embodied Carbon, kg CO2/kg material 8.3
5.5
Embodied Energy, MJ/kg 150
78
Embodied Water, L/kg 1160
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 23 to 52
190
Resilience: Unit (Modulus of Resilience), kJ/m3 61 to 920
250
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 49
24
Strength to Weight: Axial, points 16 to 39
24
Strength to Weight: Bending, points 23 to 43
22
Thermal Diffusivity, mm2/s 61
3.7
Thermal Shock Resistance, points 6.9 to 17
16

Alloy Composition

Aluminum (Al), % 93 to 97
0
Carbon (C), % 0
0 to 0.1
Chromium (Cr), % 0 to 0.4
20 to 22
Copper (Cu), % 0.7 to 1.2
0
Iron (Fe), % 0 to 0.5
44.1 to 52.7
Magnesium (Mg), % 0.8 to 1.4
0
Manganese (Mn), % 0.6 to 1.1
1.0 to 3.0
Molybdenum (Mo), % 0
1.0 to 2.0
Nickel (Ni), % 0
25 to 27
Niobium (Nb), % 0
0.25 to 0.75
Nitrogen (N), % 0
0.080 to 0.2
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0.9 to 1.8
0 to 0.75
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 0 to 0.25
0
Residuals, % 0 to 0.15
0