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S15500 Stainless Steel vs. 2218 Aluminum

S15500 stainless steel belongs to the iron alloys classification, while 2218 aluminum belongs to the aluminum alloys. There are 31 material properties with values for both materials. Properties with values for just one material (5, 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 S15500 stainless steel and the bottom bar is 2218 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 290 to 430
95 to 110
Elastic (Young's, Tensile) Modulus, GPa 190
73
Elongation at Break, % 6.8 to 16
6.8 to 10
Fatigue Strength, MPa 350 to 650
110
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 75
27
Shear Strength, MPa 540 to 870
210 to 250
Tensile Strength: Ultimate (UTS), MPa 890 to 1490
330 to 430
Tensile Strength: Yield (Proof), MPa 590 to 1310
260 to 310

Thermal Properties

Latent Heat of Fusion, J/g 280
390
Maximum Temperature: Mechanical, °C 820
220
Melting Completion (Liquidus), °C 1430
640
Melting Onset (Solidus), °C 1380
510
Specific Heat Capacity, J/kg-K 480
870
Thermal Conductivity, W/m-K 17
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 13
11
Density, g/cm3 7.8
3.1
Embodied Carbon, kg CO2/kg material 2.7
8.2
Embodied Energy, MJ/kg 39
150
Embodied Water, L/kg 130
1130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 98 to 120
27 to 31
Resilience: Unit (Modulus of Resilience), kJ/m3 890 to 4460
450 to 650
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
45
Strength to Weight: Axial, points 32 to 53
30 to 39
Strength to Weight: Bending, points 26 to 37
34 to 41
Thermal Diffusivity, mm2/s 4.6
52
Thermal Shock Resistance, points 30 to 50
15 to 19

Alloy Composition


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Aluminum (Al), % 0
88.8 to 93.6
Carbon (C), % 0 to 0.070
0
Chromium (Cr), % 14 to 15.5
0 to 0.1
Copper (Cu), % 2.5 to 4.5
3.5 to 4.5
Iron (Fe), % 71.9 to 79.9
0 to 1.0
Magnesium (Mg), % 0
1.2 to 1.8
Manganese (Mn), % 0 to 1.0
0 to 0.2
Nickel (Ni), % 3.5 to 5.5
1.7 to 2.3
Niobium (Nb), % 0.15 to 0.45
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 0.9
Sulfur (S), % 0 to 0.030
0
Zinc (Zn), % 0
0 to 0.25
Residuals, % 0
0 to 0.15