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2117 Aluminum vs. S21603 Stainless Steel

2117 aluminum belongs to the aluminum alloys classification, while S21603 stainless steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (8, 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 2117 aluminum and the bottom bar is S21603 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 70
200
Elastic (Young's, Tensile) Modulus, GPa 71
200
Elongation at Break, % 26
45
Fatigue Strength, MPa 95
360
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 27
79
Shear Strength, MPa 200
490
Tensile Strength: Ultimate (UTS), MPa 300
690
Tensile Strength: Yield (Proof), MPa 170
390

Thermal Properties

Latent Heat of Fusion, J/g 400
290
Maximum Temperature: Mechanical, °C 220
990
Melting Completion (Liquidus), °C 650
1420
Melting Onset (Solidus), °C 550
1380
Specific Heat Capacity, J/kg-K 880
480
Thermal Expansion, µm/m-K 24
17

Otherwise Unclassified Properties

Base Metal Price, % relative 10
17
Density, g/cm3 3.0
7.7
Embodied Carbon, kg CO2/kg material 8.2
3.6
Embodied Energy, MJ/kg 150
50
Embodied Water, L/kg 1150
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 64
270
Resilience: Unit (Modulus of Resilience), kJ/m3 190
380
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 47
25
Strength to Weight: Axial, points 28
25
Strength to Weight: Bending, points 33
22
Thermal Shock Resistance, points 12
15

Alloy Composition

Aluminum (Al), % 91 to 97.6
0
Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0 to 0.1
17.5 to 22
Copper (Cu), % 2.2 to 4.5
0
Iron (Fe), % 0 to 0.7
57.6 to 67.8
Magnesium (Mg), % 0.2 to 1.0
0
Manganese (Mn), % 0.4 to 1.0
7.5 to 9.0
Molybdenum (Mo), % 0
2.0 to 3.0
Nickel (Ni), % 0
5.0 to 7.0
Nitrogen (N), % 0
0.25 to 0.5
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0.2 to 0.8
0 to 0.75
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.25
0
Zinc (Zn), % 0 to 0.25
0
Zirconium (Zr), % 0 to 0.25
0
Residuals, % 0 to 0.15
0