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SAE-AISI 1086 Steel vs. 7050 Aluminum

SAE-AISI 1086 steel belongs to the iron alloys classification, while 7050 aluminum belongs to the aluminum alloys. There are 30 material properties with values for both materials. Properties with values for just one material (2, 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 SAE-AISI 1086 steel and the bottom bar is 7050 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
70
Elongation at Break, % 11
2.2 to 12
Fatigue Strength, MPa 300 to 360
130 to 210
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 72
26
Shear Strength, MPa 450 to 520
280 to 330
Tensile Strength: Ultimate (UTS), MPa 760 to 870
490 to 570
Tensile Strength: Yield (Proof), MPa 480 to 580
390 to 500

Thermal Properties

Latent Heat of Fusion, J/g 240
370
Maximum Temperature: Mechanical, °C 400
190
Melting Completion (Liquidus), °C 1460
630
Melting Onset (Solidus), °C 1410
490
Specific Heat Capacity, J/kg-K 470
860
Thermal Conductivity, W/m-K 50
140
Thermal Expansion, µm/m-K 11
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.0
35
Electrical Conductivity: Equal Weight (Specific), % IACS 8.1
100

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
10
Density, g/cm3 7.8
3.1
Embodied Carbon, kg CO2/kg material 1.4
8.2
Embodied Energy, MJ/kg 19
150
Embodied Water, L/kg 45
1120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 79 to 84
10 to 55
Resilience: Unit (Modulus of Resilience), kJ/m3 610 to 890
1110 to 1760
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
45
Strength to Weight: Axial, points 27 to 31
45 to 51
Strength to Weight: Bending, points 24 to 26
45 to 50
Thermal Diffusivity, mm2/s 14
54
Thermal Shock Resistance, points 26 to 30
21 to 25

Alloy Composition

Aluminum (Al), % 0
87.3 to 92.1
Carbon (C), % 0.8 to 0.93
0
Chromium (Cr), % 0
0 to 0.040
Copper (Cu), % 0
2.0 to 2.6
Iron (Fe), % 98.5 to 98.9
0 to 0.15
Magnesium (Mg), % 0
1.9 to 2.6
Manganese (Mn), % 0.3 to 0.5
0 to 0.1
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0
0 to 0.12
Sulfur (S), % 0 to 0.050
0
Titanium (Ti), % 0
0 to 0.060
Zinc (Zn), % 0
5.7 to 6.7
Zirconium (Zr), % 0
0.080 to 0.15
Residuals, % 0
0 to 0.15