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6261 Aluminum vs. S39277 Stainless Steel

6261 aluminum belongs to the aluminum alloys classification, while S39277 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 6261 aluminum and the bottom bar is S39277 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
200
Elongation at Break, % 9.0 to 16
28
Fatigue Strength, MPa 60 to 120
480
Poisson's Ratio 0.33
0.27
Shear Modulus, GPa 26
80
Shear Strength, MPa 90 to 180
600
Tensile Strength: Ultimate (UTS), MPa 150 to 300
930
Tensile Strength: Yield (Proof), MPa 100 to 260
660

Thermal Properties

Latent Heat of Fusion, J/g 400
300
Maximum Temperature: Mechanical, °C 160
1100
Melting Completion (Liquidus), °C 640
1460
Melting Onset (Solidus), °C 610
1410
Specific Heat Capacity, J/kg-K 900
470
Thermal Conductivity, W/m-K 180
16
Thermal Expansion, µm/m-K 23
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 48
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 160
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
23
Density, g/cm3 2.7
7.9
Embodied Carbon, kg CO2/kg material 8.3
4.2
Embodied Energy, MJ/kg 150
59
Embodied Water, L/kg 1180
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 21 to 27
240
Resilience: Unit (Modulus of Resilience), kJ/m3 77 to 500
1070
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
25
Strength to Weight: Axial, points 15 to 31
33
Strength to Weight: Bending, points 23 to 37
27
Thermal Diffusivity, mm2/s 75
4.2
Thermal Shock Resistance, points 6.5 to 13
26

Alloy Composition

Aluminum (Al), % 96.6 to 98.6
0
Carbon (C), % 0
0 to 0.025
Chromium (Cr), % 0 to 0.1
24 to 26
Copper (Cu), % 0.15 to 0.4
1.2 to 2.0
Iron (Fe), % 0 to 0.4
56.8 to 64.3
Magnesium (Mg), % 0.7 to 1.0
0
Manganese (Mn), % 0.2 to 0.35
0 to 0.8
Molybdenum (Mo), % 0
3.0 to 4.0
Nickel (Ni), % 0
6.5 to 8.0
Nitrogen (N), % 0
0.23 to 0.33
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0.4 to 0.7
0 to 0.8
Sulfur (S), % 0
0 to 0.0020
Titanium (Ti), % 0 to 0.1
0
Tungsten (W), % 0
0.8 to 1.2
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.15
0