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7021 Aluminum vs. EN 1.6570 Steel

7021 aluminum belongs to the aluminum alloys classification, while EN 1.6570 steel belongs to the iron alloys. There are 29 material properties with values for both materials. Properties with values for just one material (4, 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 7021 aluminum and the bottom bar is EN 1.6570 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
190
Elongation at Break, % 9.4
11 to 17
Fatigue Strength, MPa 150
500 to 660
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 26
73
Tensile Strength: Ultimate (UTS), MPa 460
910 to 1130
Tensile Strength: Yield (Proof), MPa 390
760 to 1060

Thermal Properties

Latent Heat of Fusion, J/g 380
250
Maximum Temperature: Mechanical, °C 200
440
Melting Completion (Liquidus), °C 630
1460
Melting Onset (Solidus), °C 510
1420
Specific Heat Capacity, J/kg-K 870
470
Thermal Conductivity, W/m-K 150
40
Thermal Expansion, µm/m-K 24
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 38
7.7
Electrical Conductivity: Equal Weight (Specific), % IACS 120
8.8

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
3.9
Density, g/cm3 2.9
7.9
Embodied Carbon, kg CO2/kg material 8.3
1.7
Embodied Energy, MJ/kg 150
23
Embodied Water, L/kg 1140
56

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 41
120 to 140
Resilience: Unit (Modulus of Resilience), kJ/m3 1110
1520 to 3010
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 47
24
Strength to Weight: Axial, points 44
32 to 40
Strength to Weight: Bending, points 45
27 to 31
Thermal Diffusivity, mm2/s 59
11
Thermal Shock Resistance, points 20
27 to 33

Alloy Composition

Aluminum (Al), % 90.7 to 93.7
0
Carbon (C), % 0
0.28 to 0.35
Chromium (Cr), % 0 to 0.050
1.0 to 1.4
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 0 to 0.4
94 to 96.2
Magnesium (Mg), % 1.2 to 1.8
0
Manganese (Mn), % 0 to 0.1
0.6 to 1.0
Molybdenum (Mo), % 0
0.3 to 0.5
Nickel (Ni), % 0
1.6 to 2.1
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0 to 0.25
0 to 0.6
Sulfur (S), % 0
0 to 0.015
Titanium (Ti), % 0 to 0.1
0
Zinc (Zn), % 5.0 to 6.0
0
Zirconium (Zr), % 0.080 to 0.18
0
Residuals, % 0 to 0.15
0