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AISI 418 Stainless Steel vs. 6081 Aluminum

AISI 418 stainless steel belongs to the iron alloys classification, while 6081 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 6081 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
69
Elongation at Break, % 17
9.0
Fatigue Strength, MPa 520
110
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 77
26
Shear Strength, MPa 680
180
Tensile Strength: Ultimate (UTS), MPa 1100
310
Tensile Strength: Yield (Proof), MPa 850
270

Thermal Properties

Latent Heat of Fusion, J/g 270
410
Maximum Temperature: Mechanical, °C 770
160
Melting Completion (Liquidus), °C 1500
640
Melting Onset (Solidus), °C 1460
610
Specific Heat Capacity, J/kg-K 470
900
Thermal Conductivity, W/m-K 25
180
Thermal Expansion, µm/m-K 10
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.8
47
Electrical Conductivity: Equal Weight (Specific), % IACS 3.1
160

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
8.3
Embodied Energy, MJ/kg 41
150
Embodied Water, L/kg 110
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 170
27
Resilience: Unit (Modulus of Resilience), kJ/m3 1830
540
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
37
Thermal Diffusivity, mm2/s 6.7
74
Thermal Shock Resistance, points 40
14

Alloy Composition

Aluminum (Al), % 0
96.3 to 98.6
Carbon (C), % 0.15 to 0.2
0
Chromium (Cr), % 12 to 14
0 to 0.1
Copper (Cu), % 0
0 to 0.1
Iron (Fe), % 78.5 to 83.6
0 to 0.5
Magnesium (Mg), % 0
0.6 to 1.0
Manganese (Mn), % 0 to 0.5
0.1 to 0.45
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
0.7 to 1.1
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
0 to 0.15
Tungsten (W), % 2.5 to 3.5
0
Zinc (Zn), % 0
0 to 0.2
Residuals, % 0
0 to 0.15