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2117 Aluminum vs. EN 1.4981 Stainless Steel

2117 aluminum belongs to the aluminum alloys classification, while EN 1.4981 stainless steel belongs to the iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (2, 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 EN 1.4981 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 70
190
Elastic (Young's, Tensile) Modulus, GPa 71
200
Elongation at Break, % 26
39
Fatigue Strength, MPa 95
210
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 27
77
Shear Strength, MPa 200
420
Tensile Strength: Ultimate (UTS), MPa 300
610
Tensile Strength: Yield (Proof), MPa 170
240

Thermal Properties

Latent Heat of Fusion, J/g 400
290
Maximum Temperature: Mechanical, °C 220
940
Melting Completion (Liquidus), °C 650
1440
Melting Onset (Solidus), °C 550
1400
Specific Heat Capacity, J/kg-K 880
470
Thermal Conductivity, W/m-K 150
16
Thermal Expansion, µm/m-K 24
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 120
2.5

Otherwise Unclassified Properties

Base Metal Price, % relative 10
25
Density, g/cm3 3.0
7.9
Embodied Carbon, kg CO2/kg material 8.2
4.8
Embodied Energy, MJ/kg 150
67
Embodied Water, L/kg 1150
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 64
190
Resilience: Unit (Modulus of Resilience), kJ/m3 190
150
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 47
24
Strength to Weight: Axial, points 28
21
Strength to Weight: Bending, points 33
20
Thermal Diffusivity, mm2/s 59
4.3
Thermal Shock Resistance, points 12
14

Alloy Composition

Aluminum (Al), % 91 to 97.6
0
Carbon (C), % 0
0.040 to 0.1
Chromium (Cr), % 0 to 0.1
15.5 to 17.5
Copper (Cu), % 2.2 to 4.5
0
Iron (Fe), % 0 to 0.7
59.6 to 66.7
Magnesium (Mg), % 0.2 to 1.0
0
Manganese (Mn), % 0.4 to 1.0
0 to 1.5
Molybdenum (Mo), % 0
1.6 to 2.0
Nickel (Ni), % 0
15.5 to 17.5
Niobium (Nb), % 0
0.4 to 1.2
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0.2 to 0.8
0.3 to 0.6
Sulfur (S), % 0
0 to 0.015
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