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AISI 418 Stainless Steel vs. 5088 Aluminum

AISI 418 stainless steel belongs to the iron alloys classification, while 5088 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 AISI 418 stainless steel and the bottom bar is 5088 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
68
Elongation at Break, % 17
29
Fatigue Strength, MPa 520
180
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 77
25
Shear Strength, MPa 680
200
Tensile Strength: Ultimate (UTS), MPa 1100
310
Tensile Strength: Yield (Proof), MPa 850
150

Thermal Properties

Latent Heat of Fusion, J/g 270
390
Maximum Temperature: Mechanical, °C 770
200
Melting Completion (Liquidus), °C 1500
640
Melting Onset (Solidus), °C 1460
540
Specific Heat Capacity, J/kg-K 470
900
Thermal Conductivity, W/m-K 25
120
Thermal Expansion, µm/m-K 10
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.8
29
Electrical Conductivity: Equal Weight (Specific), % IACS 3.1
98

Otherwise Unclassified Properties

Base Metal Price, % relative 15
9.5
Density, g/cm3 8.0
2.7
Embodied Carbon, kg CO2/kg material 2.9
9.0
Embodied Energy, MJ/kg 41
150
Embodied Water, L/kg 110
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
76
Resilience: Unit (Modulus of Resilience), kJ/m3 1830
170
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
50
Strength to Weight: Axial, points 38
32
Strength to Weight: Bending, points 29
38
Thermal Diffusivity, mm2/s 6.7
51
Thermal Shock Resistance, points 40
14

Alloy Composition

Aluminum (Al), % 0
92.4 to 94.8
Carbon (C), % 0.15 to 0.2
0
Chromium (Cr), % 12 to 14
0 to 0.15
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 78.5 to 83.6
0.1 to 0.35
Magnesium (Mg), % 0
4.7 to 5.5
Manganese (Mn), % 0 to 0.5
0.2 to 0.5
Molybdenum (Mo), % 0 to 0.5
0
Nickel (Ni), % 1.8 to 2.2
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 0.5
0 to 0.2
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 2.5 to 3.5
0
Zinc (Zn), % 0
0.2 to 0.4
Zirconium (Zr), % 0
0 to 0.15
Residuals, % 0
0 to 0.15