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2011 Aluminum vs. S21900 Stainless Steel

2011 aluminum belongs to the aluminum alloys classification, while S21900 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 2011 aluminum and the bottom bar is S21900 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
200
Elongation at Break, % 8.5 to 18
50
Fatigue Strength, MPa 74 to 120
380
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 27
78
Shear Strength, MPa 190 to 250
510
Tensile Strength: Ultimate (UTS), MPa 310 to 420
710
Tensile Strength: Yield (Proof), MPa 140 to 310
390

Thermal Properties

Latent Heat of Fusion, J/g 390
290
Maximum Temperature: Mechanical, °C 190
980
Melting Completion (Liquidus), °C 640
1400
Melting Onset (Solidus), °C 540
1350
Specific Heat Capacity, J/kg-K 870
480
Thermal Conductivity, W/m-K 140 to 170
14
Thermal Expansion, µm/m-K 23
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 35 to 45
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 100 to 130
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 11
15
Density, g/cm3 3.1
7.7
Embodied Carbon, kg CO2/kg material 7.9
3.0
Embodied Energy, MJ/kg 150
43
Embodied Water, L/kg 1150
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 29 to 52
300
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 680
380
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 44
25
Strength to Weight: Axial, points 27 to 37
26
Strength to Weight: Bending, points 32 to 40
23
Thermal Diffusivity, mm2/s 51 to 64
3.8
Thermal Shock Resistance, points 14 to 19
15

Alloy Composition

Aluminum (Al), % 91.3 to 94.6
0
Bismuth (Bi), % 0.2 to 0.6
0
Carbon (C), % 0
0 to 0.080
Chromium (Cr), % 0
19 to 21.5
Copper (Cu), % 5.0 to 6.0
0
Iron (Fe), % 0 to 0.7
59.4 to 67.4
Lead (Pb), % 0.2 to 0.6
0
Manganese (Mn), % 0
8.0 to 10
Nickel (Ni), % 0
5.5 to 7.5
Nitrogen (N), % 0
0.15 to 0.4
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0 to 0.4
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Zinc (Zn), % 0 to 0.3
0
Residuals, % 0 to 0.15
0