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6061 Aluminum vs. AISI 303 Stainless Steel

6061 aluminum belongs to the aluminum alloys classification, while AISI 303 stainless steel belongs to the iron alloys. There are 31 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 6061 aluminum and the bottom bar is AISI 303 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
200
Elongation at Break, % 3.4 to 20
40 to 51
Fatigue Strength, MPa 58 to 110
230 to 360
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 26
77
Shear Strength, MPa 84 to 210
430 to 470
Tensile Strength: Ultimate (UTS), MPa 130 to 410
600 to 690
Tensile Strength: Yield (Proof), MPa 76 to 370
230 to 420

Thermal Properties

Latent Heat of Fusion, J/g 400
290
Maximum Temperature: Mechanical, °C 170
930
Melting Completion (Liquidus), °C 650
1450
Melting Onset (Solidus), °C 580
1400
Specific Heat Capacity, J/kg-K 900
480
Thermal Conductivity, W/m-K 170
16
Thermal Expansion, µm/m-K 24
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 43
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 140
2.8

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
15
Calomel Potential, mV -740
-80
Density, g/cm3 2.7
7.8
Embodied Carbon, kg CO2/kg material 8.3
3.0
Embodied Energy, MJ/kg 150
42
Embodied Water, L/kg 1180
140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 3.8 to 81
240
Resilience: Unit (Modulus of Resilience), kJ/m3 42 to 1000
140 to 440
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
25
Strength to Weight: Axial, points 13 to 42
21 to 25
Strength to Weight: Bending, points 21 to 45
20 to 22
Thermal Diffusivity, m2/s 68
4.4
Thermal Shock Resistance, points 5.7 to 18
13 to 15

Alloy Composition

Aluminum (Al), % 95.9 to 98.6
0
Carbon (C), % 0
0 to 0.15
Chromium (Cr), % 0.040 to 0.35
17 to 19
Copper (Cu), % 0.15 to 0.4
0
Iron (Fe), % 0 to 0.7
67.3 to 74.9
Magnesium (Mg), % 0.8 to 1.2
0
Manganese (Mn), % 0 to 0.15
0 to 2.0
Nickel (Ni), % 0
8.0 to 10
Phosphorus (P), % 0
0 to 0.2
Silicon (Si), % 0.4 to 0.8
0 to 1.0
Sulfur (S), % 0
0.15 to 0.35
Titanium (Ti), % 0 to 0.15
0
Zinc (Zn), % 0 to 0.25
0
Residuals, % 0 to 0.15
0

Comparable Variants