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6070 Aluminum vs. SAE-AISI 8645 Steel

6070 aluminum belongs to the aluminum alloys classification, while SAE-AISI 8645 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 6070 aluminum and the bottom bar is SAE-AISI 8645 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
190
Elongation at Break, % 5.6 to 8.6
12 to 23
Fatigue Strength, MPa 95 to 130
280 to 350
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
73
Shear Strength, MPa 220 to 240
380 to 400
Tensile Strength: Ultimate (UTS), MPa 370 to 380
600 to 670
Tensile Strength: Yield (Proof), MPa 350
390 to 560

Thermal Properties

Latent Heat of Fusion, J/g 410
250
Maximum Temperature: Mechanical, °C 160
410
Melting Completion (Liquidus), °C 650
1460
Melting Onset (Solidus), °C 570
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 41
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 140
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 8.3
1.5
Embodied Energy, MJ/kg 150
20
Embodied Water, L/kg 1170
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 20 to 32
77 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 880 to 900
420 to 840
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 50
24
Strength to Weight: Axial, points 38
21 to 24
Strength to Weight: Bending, points 42 to 43
20 to 22
Thermal Diffusivity, mm2/s 65
10
Thermal Shock Resistance, points 16 to 17
18 to 20

Alloy Composition

Aluminum (Al), % 94.6 to 98
0
Carbon (C), % 0
0.43 to 0.48
Chromium (Cr), % 0 to 0.1
0.4 to 0.6
Copper (Cu), % 0.15 to 0.4
0
Iron (Fe), % 0 to 0.5
96.5 to 97.7
Magnesium (Mg), % 0.5 to 1.2
0
Manganese (Mn), % 0.4 to 1.0
0.75 to 1.0
Molybdenum (Mo), % 0
0.15 to 0.25
Nickel (Ni), % 0
0.4 to 0.7
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 1.0 to 1.7
0.15 to 0.35
Sulfur (S), % 0
0 to 0.040
Titanium (Ti), % 0 to 0.15
0
Zinc (Zn), % 0 to 0.25
0
Residuals, % 0 to 0.15
0