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SAE-AISI 1008 Steel vs. 7020 Aluminum

SAE-AISI 1008 steel belongs to the iron alloys classification, while 7020 aluminum belongs to the aluminum alloys. There are 31 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 SAE-AISI 1008 steel and the bottom bar is 7020 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 93 to 100
45 to 100
Elastic (Young's, Tensile) Modulus, GPa 190
70
Elongation at Break, % 22 to 33
8.4 to 14
Fatigue Strength, MPa 150 to 220
110 to 130
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 73
26
Shear Strength, MPa 220 to 230
110 to 230
Tensile Strength: Ultimate (UTS), MPa 330 to 370
190 to 390
Tensile Strength: Yield (Proof), MPa 190 to 310
120 to 310

Thermal Properties

Latent Heat of Fusion, J/g 250
380
Maximum Temperature: Mechanical, °C 400
210
Melting Completion (Liquidus), °C 1470
650
Melting Onset (Solidus), °C 1430
610
Specific Heat Capacity, J/kg-K 470
880
Thermal Conductivity, W/m-K 62
150
Thermal Expansion, µm/m-K 12
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 6.9
39
Electrical Conductivity: Equal Weight (Specific), % IACS 7.9
120

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
9.5
Density, g/cm3 7.9
2.9
Embodied Carbon, kg CO2/kg material 1.4
8.3
Embodied Energy, MJ/kg 18
150
Embodied Water, L/kg 45
1150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 78 to 91
23 to 46
Resilience: Unit (Modulus of Resilience), kJ/m3 92 to 260
110 to 690
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
47
Strength to Weight: Axial, points 12 to 13
18 to 37
Strength to Weight: Bending, points 13 to 15
25 to 41
Thermal Diffusivity, mm2/s 17
59
Thermal Shock Resistance, points 10 to 12
8.3 to 17

Alloy Composition

Aluminum (Al), % 0
91.2 to 94.8
Carbon (C), % 0 to 0.1
0
Chromium (Cr), % 0
0.1 to 0.35
Copper (Cu), % 0
0 to 0.2
Iron (Fe), % 99.31 to 99.7
0 to 0.4
Magnesium (Mg), % 0
1.0 to 1.4
Manganese (Mn), % 0.3 to 0.5
0.050 to 0.5
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0
0 to 0.35
Sulfur (S), % 0 to 0.050
0
Titanium (Ti), % 0
0 to 0.25
Zinc (Zn), % 0
4.0 to 5.0
Zirconium (Zr), % 0
0.080 to 0.25
Residuals, % 0
0 to 0.15