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6018 Aluminum vs. AISI 440A Stainless Steel

6018 aluminum belongs to the aluminum alloys classification, while AISI 440A stainless steel belongs to the iron alloys. There are 29 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 6018 aluminum and the bottom bar is AISI 440A stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
200
Elongation at Break, % 9.0 to 9.1
5.0 to 20
Fatigue Strength, MPa 85 to 89
270 to 790
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 26
77
Shear Strength, MPa 170 to 180
450 to 1040
Tensile Strength: Ultimate (UTS), MPa 290 to 300
730 to 1790
Tensile Strength: Yield (Proof), MPa 220 to 230
420 to 1650

Thermal Properties

Latent Heat of Fusion, J/g 400
280
Maximum Temperature: Mechanical, °C 160
760
Melting Completion (Liquidus), °C 640
1480
Melting Onset (Solidus), °C 570
1370
Specific Heat Capacity, J/kg-K 890
480
Thermal Conductivity, W/m-K 170
23
Thermal Expansion, µm/m-K 23
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 44
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 140
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 10
9.0
Density, g/cm3 2.9
7.7
Embodied Carbon, kg CO2/kg material 8.2
2.2
Embodied Energy, MJ/kg 150
31
Embodied Water, L/kg 1180
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 24 to 25
87 to 120
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 48
25
Strength to Weight: Axial, points 28 to 29
26 to 65
Strength to Weight: Bending, points 34 to 35
23 to 43
Thermal Diffusivity, mm2/s 65
6.2
Thermal Shock Resistance, points 13
26 to 65

Alloy Composition


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Aluminum (Al), % 93.1 to 97.8
0
Bismuth (Bi), % 0.4 to 0.7
0
Carbon (C), % 0
0.6 to 0.75
Chromium (Cr), % 0 to 0.1
16 to 18
Copper (Cu), % 0.15 to 0.4
0
Iron (Fe), % 0 to 0.7
78.4 to 83.4
Lead (Pb), % 0.4 to 1.2
0
Magnesium (Mg), % 0.6 to 1.2
0
Manganese (Mn), % 0.3 to 0.8
0 to 1.0
Molybdenum (Mo), % 0
0 to 0.75
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0.5 to 1.2
0 to 1.0
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 0 to 0.3
0
Residuals, % 0 to 0.15
0