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S35500 Stainless Steel vs. 2218 Aluminum

S35500 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 (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 S35500 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, % 14
6.8 to 10
Fatigue Strength, MPa 690 to 730
110
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 78
27
Shear Strength, MPa 810 to 910
210 to 250
Tensile Strength: Ultimate (UTS), MPa 1330 to 1490
330 to 430
Tensile Strength: Yield (Proof), MPa 1200 to 1280
260 to 310

Thermal Properties

Latent Heat of Fusion, J/g 280
390
Maximum Temperature: Mechanical, °C 870
220
Melting Completion (Liquidus), °C 1460
640
Melting Onset (Solidus), °C 1420
510
Specific Heat Capacity, J/kg-K 470
870
Thermal Conductivity, W/m-K 16
140
Thermal Expansion, µm/m-K 11
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 16
11
Density, g/cm3 7.8
3.1
Embodied Carbon, kg CO2/kg material 3.5
8.2
Embodied Energy, MJ/kg 47
150
Embodied Water, L/kg 130
1130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 180 to 190
27 to 31
Resilience: Unit (Modulus of Resilience), kJ/m3 3610 to 4100
450 to 650
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
45
Strength to Weight: Axial, points 47 to 53
30 to 39
Strength to Weight: Bending, points 34 to 37
34 to 41
Thermal Diffusivity, mm2/s 4.4
52
Thermal Shock Resistance, points 44 to 49
15 to 19

Alloy Composition

Aluminum (Al), % 0
88.8 to 93.6
Carbon (C), % 0.1 to 0.15
0
Chromium (Cr), % 15 to 16
0 to 0.1
Copper (Cu), % 0
3.5 to 4.5
Iron (Fe), % 73.2 to 77.7
0 to 1.0
Magnesium (Mg), % 0
1.2 to 1.8
Manganese (Mn), % 0.5 to 1.3
0 to 0.2
Molybdenum (Mo), % 2.5 to 3.2
0
Nickel (Ni), % 4.0 to 5.0
1.7 to 2.3
Niobium (Nb), % 0.1 to 0.5
0
Nitrogen (N), % 0.070 to 0.13
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 0.5
0 to 0.9
Sulfur (S), % 0 to 0.030
0
Zinc (Zn), % 0
0 to 0.25
Residuals, % 0
0 to 0.15

Comparable Variants