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AISI 309 Stainless Steel vs. 6105 Aluminum

AISI 309 stainless steel belongs to the iron alloys classification, while 6105 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 309 stainless steel and the bottom bar is 6105 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
68
Elongation at Break, % 34 to 47
9.0 to 16
Fatigue Strength, MPa 250 to 280
95 to 130
Poisson's Ratio 0.27
0.33
Shear Modulus, GPa 78
26
Shear Strength, MPa 420 to 470
120 to 170
Tensile Strength: Ultimate (UTS), MPa 600 to 710
190 to 280
Tensile Strength: Yield (Proof), MPa 260 to 350
120 to 270

Thermal Properties

Latent Heat of Fusion, J/g 290
410
Maximum Temperature: Mechanical, °C 980
160
Melting Completion (Liquidus), °C 1450
650
Melting Onset (Solidus), °C 1400
600
Specific Heat Capacity, J/kg-K 480
900
Thermal Conductivity, W/m-K 16
180 to 190
Thermal Expansion, µm/m-K 15
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
46 to 50
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
150 to 170

Otherwise Unclassified Properties

Base Metal Price, % relative 19
9.5
Density, g/cm3 7.8
2.7
Embodied Carbon, kg CO2/kg material 3.6
8.3
Embodied Energy, MJ/kg 51
150
Embodied Water, L/kg 170
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200 to 230
25 to 27
Resilience: Unit (Modulus of Resilience), kJ/m3 170 to 310
100 to 550
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
51
Strength to Weight: Axial, points 21 to 25
20 to 29
Strength to Weight: Bending, points 20 to 23
28 to 35
Thermal Diffusivity, mm2/s 4.3
72 to 79
Thermal Shock Resistance, points 14 to 16
8.6 to 12

Alloy Composition

Aluminum (Al), % 0
97.2 to 99
Carbon (C), % 0 to 0.2
0
Chromium (Cr), % 22 to 24
0 to 0.1
Copper (Cu), % 0
0 to 0.1
Iron (Fe), % 58 to 66
0 to 0.35
Magnesium (Mg), % 0
0.45 to 0.8
Manganese (Mn), % 0 to 2.0
0 to 0.1
Nickel (Ni), % 12 to 15
0
Phosphorus (P), % 0 to 0.045
0
Silicon (Si), % 0 to 0.75
0.6 to 1.0
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
0 to 0.1
Zinc (Zn), % 0
0 to 0.1
Residuals, % 0
0 to 0.15