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5049 Aluminum vs. S31266 Stainless Steel

5049 aluminum belongs to the aluminum alloys classification, while S31266 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 5049 aluminum and the bottom bar is S31266 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
210
Elongation at Break, % 2.0 to 18
40
Fatigue Strength, MPa 79 to 130
400
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 26
81
Shear Strength, MPa 130 to 190
590
Tensile Strength: Ultimate (UTS), MPa 210 to 330
860
Tensile Strength: Yield (Proof), MPa 91 to 280
470

Thermal Properties

Latent Heat of Fusion, J/g 400
310
Maximum Temperature: Mechanical, °C 190
1100
Melting Completion (Liquidus), °C 650
1470
Melting Onset (Solidus), °C 620
1420
Specific Heat Capacity, J/kg-K 900
460
Thermal Conductivity, W/m-K 140
12
Thermal Expansion, µm/m-K 24
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 35
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 110
2.0

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
37
Density, g/cm3 2.7
8.2
Embodied Carbon, kg CO2/kg material 8.5
6.5
Embodied Energy, MJ/kg 150
89
Embodied Water, L/kg 1180
220

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 6.0 to 31
290
Resilience: Unit (Modulus of Resilience), kJ/m3 59 to 570
540
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
24
Strength to Weight: Axial, points 22 to 34
29
Strength to Weight: Bending, points 29 to 39
24
Thermal Diffusivity, mm2/s 56
3.1
Thermal Shock Resistance, points 9.3 to 15
18

Alloy Composition

Aluminum (Al), % 94.7 to 97.9
0
Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0 to 0.3
23 to 25
Copper (Cu), % 0 to 0.1
1.0 to 2.5
Iron (Fe), % 0 to 0.5
34.1 to 46
Magnesium (Mg), % 1.6 to 2.5
0
Manganese (Mn), % 0.5 to 1.1
2.0 to 4.0
Molybdenum (Mo), % 0
5.2 to 6.2
Nickel (Ni), % 0
21 to 24
Nitrogen (N), % 0
0.35 to 0.6
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0 to 0.4
0 to 1.0
Sulfur (S), % 0
0 to 0.020
Titanium (Ti), % 0 to 0.1
0
Tungsten (W), % 0
1.5 to 2.5
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.15
0