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2117 Aluminum vs. S38815 Stainless Steel

2117 aluminum belongs to the aluminum alloys classification, while S38815 stainless steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (6, 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 S38815 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 70
190
Elastic (Young's, Tensile) Modulus, GPa 71
190
Elongation at Break, % 26
34
Fatigue Strength, MPa 95
230
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 27
74
Shear Strength, MPa 200
410
Tensile Strength: Ultimate (UTS), MPa 300
610
Tensile Strength: Yield (Proof), MPa 170
290

Thermal Properties

Latent Heat of Fusion, J/g 400
370
Maximum Temperature: Mechanical, °C 220
860
Melting Completion (Liquidus), °C 650
1360
Melting Onset (Solidus), °C 550
1310
Specific Heat Capacity, J/kg-K 880
500
Thermal Expansion, µm/m-K 24
15

Otherwise Unclassified Properties

Base Metal Price, % relative 10
19
Density, g/cm3 3.0
7.5
Embodied Carbon, kg CO2/kg material 8.2
3.8
Embodied Energy, MJ/kg 150
54
Embodied Water, L/kg 1150
140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 64
170
Resilience: Unit (Modulus of Resilience), kJ/m3 190
220
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 47
25
Strength to Weight: Axial, points 28
22
Strength to Weight: Bending, points 33
21
Thermal Shock Resistance, points 12
15

Alloy Composition

Aluminum (Al), % 91 to 97.6
0 to 0.3
Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0 to 0.1
13 to 15
Copper (Cu), % 2.2 to 4.5
0.75 to 1.5
Iron (Fe), % 0 to 0.7
56.1 to 67
Magnesium (Mg), % 0.2 to 1.0
0
Manganese (Mn), % 0.4 to 1.0
0 to 2.0
Molybdenum (Mo), % 0
0.75 to 1.5
Nickel (Ni), % 0
13 to 17
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0.2 to 0.8
5.5 to 6.5
Sulfur (S), % 0
0 to 0.020
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