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EN 1.6957 Steel vs. 7020 Aluminum

EN 1.6957 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 (3, 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 EN 1.6957 steel and the bottom bar is 7020 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 280
45 to 100
Elastic (Young's, Tensile) Modulus, GPa 190
70
Elongation at Break, % 18
8.4 to 14
Fatigue Strength, MPa 530
110 to 130
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 73
26
Shear Strength, MPa 570
110 to 230
Tensile Strength: Ultimate (UTS), MPa 930
190 to 390
Tensile Strength: Yield (Proof), MPa 780
120 to 310

Thermal Properties

Latent Heat of Fusion, J/g 250
380
Maximum Temperature: Mechanical, °C 450
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 47
150
Thermal Expansion, µm/m-K 13
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.9
39
Electrical Conductivity: Equal Weight (Specific), % IACS 9.1
120

Otherwise Unclassified Properties

Base Metal Price, % relative 5.0
9.5
Density, g/cm3 7.9
2.9
Embodied Carbon, kg CO2/kg material 2.1
8.3
Embodied Energy, MJ/kg 29
150
Embodied Water, L/kg 60
1150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 160
23 to 46
Resilience: Unit (Modulus of Resilience), kJ/m3 1630
110 to 690
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
47
Strength to Weight: Axial, points 33
18 to 37
Strength to Weight: Bending, points 27
25 to 41
Thermal Diffusivity, mm2/s 13
59
Thermal Shock Resistance, points 27
8.3 to 17

Alloy Composition

Aluminum (Al), % 0
91.2 to 94.8
Carbon (C), % 0.22 to 0.32
0
Chromium (Cr), % 1.2 to 1.8
0.1 to 0.35
Copper (Cu), % 0
0 to 0.2
Iron (Fe), % 92.7 to 94.7
0 to 0.4
Magnesium (Mg), % 0
1.0 to 1.4
Manganese (Mn), % 0.15 to 0.4
0.050 to 0.5
Molybdenum (Mo), % 0.25 to 0.45
0
Nickel (Ni), % 3.4 to 4.0
0
Phosphorus (P), % 0 to 0.010
0
Silicon (Si), % 0 to 0.15
0 to 0.35
Sulfur (S), % 0 to 0.0070
0
Titanium (Ti), % 0
0 to 0.25
Vanadium (V), % 0.050 to 0.15
0
Zinc (Zn), % 0
4.0 to 5.0
Zirconium (Zr), % 0
0.080 to 0.25
Residuals, % 0
0 to 0.15