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Grade FDSiCr Steel vs. 7020 Aluminum

Grade FDSiCr steel belongs to the iron alloys classification, while 7020 aluminum belongs to the aluminum alloys. There are 25 material properties with values for both materials. Properties with values for just one material (7, 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 grade FDSiCr steel and the bottom bar is 7020 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 580
45 to 100
Elastic (Young's, Tensile) Modulus, GPa 190
70
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 80
26
Tensile Strength: Ultimate (UTS), MPa 1930
190 to 390

Thermal Properties

Latent Heat of Fusion, J/g 270
380
Maximum Temperature: Mechanical, °C 410
210
Melting Completion (Liquidus), °C 1440
650
Melting Onset (Solidus), °C 1400
610
Specific Heat Capacity, J/kg-K 480
880
Thermal Conductivity, W/m-K 48
150
Thermal Expansion, µm/m-K 13
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
39
Electrical Conductivity: Equal Weight (Specific), % IACS 8.5
120

Otherwise Unclassified Properties

Base Metal Price, % relative 2.2
9.5
Density, g/cm3 7.7
2.9
Embodied Carbon, kg CO2/kg material 1.5
8.3
Embodied Energy, MJ/kg 20
150
Embodied Water, L/kg 48
1150

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
47
Strength to Weight: Axial, points 69
18 to 37
Strength to Weight: Bending, points 44
25 to 41
Thermal Diffusivity, mm2/s 13
59
Thermal Shock Resistance, points 58
8.3 to 17

Alloy Composition

Aluminum (Al), % 0
91.2 to 94.8
Carbon (C), % 0.5 to 0.6
0
Chromium (Cr), % 0.5 to 0.8
0.1 to 0.35
Copper (Cu), % 0 to 0.12
0 to 0.2
Iron (Fe), % 96.5 to 97.8
0 to 0.4
Magnesium (Mg), % 0
1.0 to 1.4
Manganese (Mn), % 0.5 to 0.9
0.050 to 0.5
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 1.2 to 1.6
0 to 0.35
Sulfur (S), % 0 to 0.025
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