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SAE-AISI 8625 Steel vs. 7020 Aluminum

SAE-AISI 8625 steel belongs to the iron alloys classification, while 7020 aluminum belongs to the aluminum alloys. 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 8625 steel and the bottom bar is 7020 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
45 to 100
Elastic (Young's, Tensile) Modulus, GPa 190
70
Elongation at Break, % 25
8.4 to 14
Fatigue Strength, MPa 240
110 to 130
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 73
26
Shear Strength, MPa 330
110 to 230
Tensile Strength: Ultimate (UTS), MPa 510
190 to 390
Tensile Strength: Yield (Proof), MPa 330
120 to 310

Thermal Properties

Latent Heat of Fusion, J/g 250
380
Maximum Temperature: Mechanical, °C 410
210
Melting Completion (Liquidus), °C 1460
650
Melting Onset (Solidus), °C 1420
610
Specific Heat Capacity, J/kg-K 470
880
Thermal Conductivity, W/m-K 39
150
Thermal Expansion, µm/m-K 11
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
39
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
120

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
9.5
Density, g/cm3 7.8
2.9
Embodied Carbon, kg CO2/kg material 1.5
8.3
Embodied Energy, MJ/kg 20
150
Embodied Water, L/kg 50
1150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
23 to 46
Resilience: Unit (Modulus of Resilience), kJ/m3 300
110 to 690
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
47
Strength to Weight: Axial, points 18
18 to 37
Strength to Weight: Bending, points 18
25 to 41
Thermal Diffusivity, mm2/s 10
59
Thermal Shock Resistance, points 17
8.3 to 17

Alloy Composition

Aluminum (Al), % 0
91.2 to 94.8
Carbon (C), % 0.23 to 0.28
0
Chromium (Cr), % 0.4 to 0.6
0.1 to 0.35
Copper (Cu), % 0
0 to 0.2
Iron (Fe), % 96.8 to 98
0 to 0.4
Magnesium (Mg), % 0
1.0 to 1.4
Manganese (Mn), % 0.7 to 0.9
0.050 to 0.5
Molybdenum (Mo), % 0.15 to 0.25
0
Nickel (Ni), % 0.4 to 0.7
0
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0.15 to 0.35
0 to 0.35
Sulfur (S), % 0 to 0.040
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