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EN 1.4303 Stainless Steel vs. 6081 Aluminum

EN 1.4303 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 EN 1.4303 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, % 13 to 49
9.0
Fatigue Strength, MPa 220 to 320
110
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 77
26
Shear Strength, MPa 420 to 540
180
Tensile Strength: Ultimate (UTS), MPa 590 to 900
310
Tensile Strength: Yield (Proof), MPa 230 to 560
270

Thermal Properties

Latent Heat of Fusion, J/g 290
410
Maximum Temperature: Mechanical, °C 940
160
Melting Completion (Liquidus), °C 1420
640
Melting Onset (Solidus), °C 1380
610
Specific Heat Capacity, J/kg-K 480
900
Thermal Conductivity, W/m-K 15
180
Thermal Expansion, µm/m-K 16
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.4
47
Electrical Conductivity: Equal Weight (Specific), % IACS 2.7
160

Otherwise Unclassified Properties

Base Metal Price, % relative 17
9.5
Density, g/cm3 7.8
2.7
Embodied Carbon, kg CO2/kg material 3.2
8.3
Embodied Energy, MJ/kg 46
150
Embodied Water, L/kg 150
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110 to 230
27
Resilience: Unit (Modulus of Resilience), kJ/m3 140 to 800
540
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
50
Strength to Weight: Axial, points 21 to 32
32
Strength to Weight: Bending, points 20 to 26
37
Thermal Diffusivity, mm2/s 4.0
74
Thermal Shock Resistance, points 13 to 20
14

Alloy Composition

Aluminum (Al), % 0
96.3 to 98.6
Carbon (C), % 0 to 0.060
0
Chromium (Cr), % 17 to 19
0 to 0.1
Copper (Cu), % 0
0 to 0.1
Iron (Fe), % 64.8 to 72
0 to 0.5
Magnesium (Mg), % 0
0.6 to 1.0
Manganese (Mn), % 0 to 2.0
0.1 to 0.45
Nickel (Ni), % 11 to 13
0
Nitrogen (N), % 0 to 0.1
0
Phosphorus (P), % 0 to 0.045
0
Silicon (Si), % 0 to 1.0
0.7 to 1.1
Sulfur (S), % 0 to 0.015
0
Titanium (Ti), % 0
0 to 0.15
Zinc (Zn), % 0
0 to 0.2
Residuals, % 0
0 to 0.15