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6066 Aluminum vs. EN 1.7703 Steel

6066 aluminum belongs to the aluminum alloys classification, while EN 1.7703 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 6066 aluminum and the bottom bar is EN 1.7703 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
190
Elongation at Break, % 7.8 to 17
20
Fatigue Strength, MPa 94 to 130
320 to 340
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
74
Shear Strength, MPa 95 to 240
420 to 430
Tensile Strength: Ultimate (UTS), MPa 160 to 400
670 to 690
Tensile Strength: Yield (Proof), MPa 93 to 360
460 to 500

Thermal Properties

Latent Heat of Fusion, J/g 410
250
Maximum Temperature: Mechanical, °C 170
460
Melting Completion (Liquidus), °C 650
1470
Melting Onset (Solidus), °C 560
1430
Specific Heat Capacity, J/kg-K 890
470
Thermal Conductivity, W/m-K 150
39
Thermal Expansion, µm/m-K 23
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40
7.6
Electrical Conductivity: Equal Weight (Specific), % IACS 130
8.7

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
4.2
Density, g/cm3 2.8
7.9
Embodied Carbon, kg CO2/kg material 8.3
2.5
Embodied Energy, MJ/kg 150
35
Embodied Water, L/kg 1160
61

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 23 to 52
120 to 130
Resilience: Unit (Modulus of Resilience), kJ/m3 61 to 920
570 to 650
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 49
24
Strength to Weight: Axial, points 16 to 39
24
Strength to Weight: Bending, points 23 to 43
22
Thermal Diffusivity, mm2/s 61
11
Thermal Shock Resistance, points 6.9 to 17
19 to 20

Alloy Composition

Aluminum (Al), % 93 to 97
0
Carbon (C), % 0
0.11 to 0.15
Chromium (Cr), % 0 to 0.4
2.0 to 2.5
Copper (Cu), % 0.7 to 1.2
0 to 0.2
Iron (Fe), % 0 to 0.5
94.6 to 96.4
Magnesium (Mg), % 0.8 to 1.4
0
Manganese (Mn), % 0.6 to 1.1
0.3 to 0.6
Molybdenum (Mo), % 0
0.9 to 1.1
Nickel (Ni), % 0
0 to 0.25
Niobium (Nb), % 0
0 to 0.070
Nitrogen (N), % 0
0 to 0.012
Phosphorus (P), % 0
0 to 0.015
Silicon (Si), % 0.9 to 1.8
0 to 0.1
Sulfur (S), % 0
0 to 0.0050
Titanium (Ti), % 0 to 0.2
0 to 0.030
Vanadium (V), % 0
0.25 to 0.35
Zinc (Zn), % 0 to 0.25
0
Residuals, % 0 to 0.15
0