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EN 1.4521 Stainless Steel vs. 2218 Aluminum

EN 1.4521 stainless steel belongs to the iron alloys classification, while 2218 aluminum belongs to the aluminum alloys. There are 30 material properties with values for both materials. Properties with values for just one material (3, 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 EN 1.4521 stainless steel and the bottom bar is 2218 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
73
Elongation at Break, % 23
6.8 to 10
Fatigue Strength, MPa 230
110
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 78
27
Shear Strength, MPa 330
210 to 250
Tensile Strength: Ultimate (UTS), MPa 520
330 to 430
Tensile Strength: Yield (Proof), MPa 340
260 to 310

Thermal Properties

Latent Heat of Fusion, J/g 290
390
Maximum Temperature: Mechanical, °C 930
220
Melting Completion (Liquidus), °C 1460
640
Melting Onset (Solidus), °C 1410
510
Specific Heat Capacity, J/kg-K 480
870
Thermal Conductivity, W/m-K 23
140
Thermal Expansion, µm/m-K 10
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
37
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
110

Otherwise Unclassified Properties

Base Metal Price, % relative 12
11
Density, g/cm3 7.7
3.1
Embodied Carbon, kg CO2/kg material 2.8
8.2
Embodied Energy, MJ/kg 39
150
Embodied Water, L/kg 130
1130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 100
27 to 31
Resilience: Unit (Modulus of Resilience), kJ/m3 280
450 to 650
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
45
Strength to Weight: Axial, points 19
30 to 39
Strength to Weight: Bending, points 19
34 to 41
Thermal Diffusivity, mm2/s 6.2
52
Thermal Shock Resistance, points 18
15 to 19

Alloy Composition

Aluminum (Al), % 0
88.8 to 93.6
Carbon (C), % 0 to 0.025
0
Chromium (Cr), % 17 to 20
0 to 0.1
Copper (Cu), % 0
3.5 to 4.5
Iron (Fe), % 74.6 to 81.1
0 to 1.0
Magnesium (Mg), % 0
1.2 to 1.8
Manganese (Mn), % 0 to 1.0
0 to 0.2
Molybdenum (Mo), % 1.8 to 2.5
0
Nickel (Ni), % 0
1.7 to 2.3
Nitrogen (N), % 0 to 0.030
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 0.9
Sulfur (S), % 0 to 0.015
0
Titanium (Ti), % 0.15 to 0.8
0
Zinc (Zn), % 0
0 to 0.25
Residuals, % 0
0 to 0.15