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EN 1.5508 Steel vs. 7021 Aluminum

EN 1.5508 steel belongs to the iron alloys classification, while 7021 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 EN 1.5508 steel and the bottom bar is 7021 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
69
Elongation at Break, % 11 to 20
9.4
Fatigue Strength, MPa 210 to 320
150
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 73
26
Shear Strength, MPa 300 to 360
270
Tensile Strength: Ultimate (UTS), MPa 420 to 1460
460
Tensile Strength: Yield (Proof), MPa 310 to 490
390

Thermal Properties

Latent Heat of Fusion, J/g 250
380
Maximum Temperature: Mechanical, °C 400
200
Melting Completion (Liquidus), °C 1460
630
Melting Onset (Solidus), °C 1420
510
Specific Heat Capacity, J/kg-K 470
870
Thermal Conductivity, W/m-K 51
150
Thermal Expansion, µm/m-K 13
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.1
38
Electrical Conductivity: Equal Weight (Specific), % IACS 8.2
120

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
9.5
Density, g/cm3 7.8
2.9
Embodied Carbon, kg CO2/kg material 1.4
8.3
Embodied Energy, MJ/kg 19
150
Embodied Water, L/kg 47
1140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 44 to 230
41
Resilience: Unit (Modulus of Resilience), kJ/m3 260 to 640
1110
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
47
Strength to Weight: Axial, points 15 to 52
44
Strength to Weight: Bending, points 16 to 36
45
Thermal Diffusivity, mm2/s 14
59
Thermal Shock Resistance, points 12 to 43
20

Alloy Composition

Aluminum (Al), % 0
90.7 to 93.7
Boron (B), % 0.00080 to 0.0050
0
Carbon (C), % 0.2 to 0.25
0
Chromium (Cr), % 0 to 0.3
0 to 0.050
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 97.9 to 99.199
0 to 0.4
Magnesium (Mg), % 0
1.2 to 1.8
Manganese (Mn), % 0.6 to 0.9
0 to 0.1
Phosphorus (P), % 0 to 0.025
0
Silicon (Si), % 0 to 0.3
0 to 0.25
Sulfur (S), % 0 to 0.025
0
Titanium (Ti), % 0
0 to 0.1
Zinc (Zn), % 0
5.0 to 6.0
Zirconium (Zr), % 0
0.080 to 0.18
Residuals, % 0
0 to 0.15