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6182 Aluminum vs. SAE-AISI 8740 Steel

6182 aluminum belongs to the aluminum alloys classification, while SAE-AISI 8740 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 6182 aluminum and the bottom bar is SAE-AISI 8740 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
190
Elongation at Break, % 6.8 to 13
11 to 23
Fatigue Strength, MPa 63 to 99
270 to 350
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
73
Shear Strength, MPa 140 to 190
370 to 400
Tensile Strength: Ultimate (UTS), MPa 230 to 320
580 to 670
Tensile Strength: Yield (Proof), MPa 130 to 270
380 to 570

Thermal Properties

Latent Heat of Fusion, J/g 410
250
Maximum Temperature: Mechanical, °C 190
410
Melting Completion (Liquidus), °C 640
1460
Melting Onset (Solidus), °C 600
1420
Specific Heat Capacity, J/kg-K 900
470
Thermal Conductivity, W/m-K 160
39
Thermal Expansion, µm/m-K 23
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 130
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
2.6
Density, g/cm3 2.7
7.8
Embodied Carbon, kg CO2/kg material 8.4
1.5
Embodied Energy, MJ/kg 150
20
Embodied Water, L/kg 1170
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 21 to 26
71 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 520
390 to 850
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 50
24
Strength to Weight: Axial, points 23 to 32
20 to 24
Strength to Weight: Bending, points 30 to 38
20 to 22
Thermal Diffusivity, mm2/s 65
10
Thermal Shock Resistance, points 10 to 14
17 to 20

Alloy Composition

Aluminum (Al), % 95 to 97.9
0
Carbon (C), % 0
0.38 to 0.43
Chromium (Cr), % 0 to 0.25
0.4 to 0.6
Copper (Cu), % 0 to 0.1
0
Iron (Fe), % 0 to 0.5
96.5 to 97.7
Magnesium (Mg), % 0.7 to 1.2
0
Manganese (Mn), % 0.5 to 1.0
0.75 to 1.0
Molybdenum (Mo), % 0
0.2 to 0.3
Nickel (Ni), % 0
0.4 to 0.7
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0.9 to 1.3
0.15 to 0.35
Sulfur (S), % 0
0 to 0.040
Titanium (Ti), % 0 to 0.1
0
Zinc (Zn), % 0 to 0.2
0
Zirconium (Zr), % 0.050 to 0.2
0
Residuals, % 0 to 0.15
0