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6066 Aluminum vs. ASTM A204 Steel

6066 aluminum belongs to the aluminum alloys classification, while ASTM A204 steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (1, 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 6066 aluminum and the bottom bar is ASTM A204 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
190
Elongation at Break, % 7.8 to 17
18 to 22
Fatigue Strength, MPa 94 to 130
200 to 220
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
73
Shear Strength, MPa 95 to 240
330 to 360
Tensile Strength: Ultimate (UTS), MPa 160 to 400
520 to 590
Tensile Strength: Yield (Proof), MPa 93 to 360
290 to 330

Thermal Properties

Latent Heat of Fusion, J/g 410
250
Maximum Temperature: Mechanical, °C 170
410
Melting Completion (Liquidus), °C 650
1470
Melting Onset (Solidus), °C 560
1420 to 1430
Specific Heat Capacity, J/kg-K 890
470
Thermal Conductivity, W/m-K 150
52
Thermal Expansion, µm/m-K 23
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 130
8.2

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
2.4
Density, g/cm3 2.8
7.9
Embodied Carbon, kg CO2/kg material 8.3
1.5
Embodied Energy, MJ/kg 150
20
Embodied Water, L/kg 1160
47

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 23 to 52
90 to 95
Resilience: Unit (Modulus of Resilience), kJ/m3 61 to 920
220 to 290
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 49
24
Strength to Weight: Axial, points 16 to 39
18 to 21
Strength to Weight: Bending, points 23 to 43
18 to 20
Thermal Diffusivity, mm2/s 61
14
Thermal Shock Resistance, points 6.9 to 17
15 to 17