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6081 Aluminum vs. EN 1.4423 Stainless Steel

6081 aluminum belongs to the aluminum alloys classification, while EN 1.4423 stainless steel belongs to the iron alloys. There are 30 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 6081 aluminum and the bottom bar is EN 1.4423 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
200
Elongation at Break, % 9.0
17
Fatigue Strength, MPa 110
380
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 26
77
Shear Strength, MPa 180
520
Tensile Strength: Ultimate (UTS), MPa 310
850
Tensile Strength: Yield (Proof), MPa 270
630

Thermal Properties

Latent Heat of Fusion, J/g 410
280
Maximum Temperature: Mechanical, °C 160
780
Melting Completion (Liquidus), °C 640
1460
Melting Onset (Solidus), °C 610
1420
Specific Heat Capacity, J/kg-K 900
470
Thermal Conductivity, W/m-K 180
16
Thermal Expansion, µm/m-K 23
9.9

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 47
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 160
2.6

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
14
Density, g/cm3 2.7
7.9
Embodied Carbon, kg CO2/kg material 8.3
3.2
Embodied Energy, MJ/kg 150
43
Embodied Water, L/kg 1180
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 27
130
Resilience: Unit (Modulus of Resilience), kJ/m3 540
1000
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
25
Strength to Weight: Axial, points 32
30
Strength to Weight: Bending, points 37
25
Thermal Diffusivity, mm2/s 74
4.3
Thermal Shock Resistance, points 14
31

Alloy Composition

Aluminum (Al), % 96.3 to 98.6
0
Carbon (C), % 0
0 to 0.020
Chromium (Cr), % 0 to 0.1
11 to 13
Copper (Cu), % 0 to 0.1
0.2 to 0.8
Iron (Fe), % 0 to 0.5
73.8 to 80.5
Magnesium (Mg), % 0.6 to 1.0
0
Manganese (Mn), % 0.1 to 0.45
0 to 2.0
Molybdenum (Mo), % 0
2.3 to 2.8
Nickel (Ni), % 0
6.0 to 7.0
Nitrogen (N), % 0
0 to 0.020
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0.7 to 1.1
0 to 0.5
Sulfur (S), % 0
0 to 0.0030
Titanium (Ti), % 0 to 0.15
0
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.15
0