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7020 Aluminum vs. ASTM A387 Grade 91 Class 2

7020 aluminum belongs to the aluminum alloys classification, while ASTM A387 grade 91 class 2 belongs to the iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (1, 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 7020 aluminum and the bottom bar is ASTM A387 grade 91 class 2.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 45 to 100
200
Elastic (Young's, Tensile) Modulus, GPa 70
190
Elongation at Break, % 8.4 to 14
20
Fatigue Strength, MPa 110 to 130
330
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 26
75
Shear Strength, MPa 110 to 230
420
Tensile Strength: Ultimate (UTS), MPa 190 to 390
670
Tensile Strength: Yield (Proof), MPa 120 to 310
470

Thermal Properties

Latent Heat of Fusion, J/g 380
270
Maximum Temperature: Mechanical, °C 210
600
Melting Completion (Liquidus), °C 650
1460
Melting Onset (Solidus), °C 610
1420
Specific Heat Capacity, J/kg-K 880
470
Thermal Conductivity, W/m-K 150
26
Thermal Expansion, µm/m-K 23
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 39
8.9
Electrical Conductivity: Equal Weight (Specific), % IACS 120
10

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
7.0
Density, g/cm3 2.9
7.8
Embodied Carbon, kg CO2/kg material 8.3
2.6
Embodied Energy, MJ/kg 150
37
Embodied Water, L/kg 1150
88

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 23 to 46
120
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 690
580
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 47
25
Strength to Weight: Axial, points 18 to 37
24
Strength to Weight: Bending, points 25 to 41
22
Thermal Diffusivity, mm2/s 59
6.9
Thermal Shock Resistance, points 8.3 to 17
19

Alloy Composition

Aluminum (Al), % 91.2 to 94.8
0 to 0.020
Carbon (C), % 0
0.080 to 0.12
Chromium (Cr), % 0.1 to 0.35
8.0 to 9.5
Copper (Cu), % 0 to 0.2
0
Iron (Fe), % 0 to 0.4
87.3 to 90.3
Magnesium (Mg), % 1.0 to 1.4
0
Manganese (Mn), % 0.050 to 0.5
0.3 to 0.6
Molybdenum (Mo), % 0
0.85 to 1.1
Nickel (Ni), % 0
0 to 0.4
Niobium (Nb), % 0
0.060 to 0.1
Nitrogen (N), % 0
0.030 to 0.070
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0 to 0.35
0.2 to 0.5
Sulfur (S), % 0
0 to 0.010
Titanium (Ti), % 0 to 0.25
0 to 0.010
Vanadium (V), % 0
0.18 to 0.25
Zinc (Zn), % 4.0 to 5.0
0
Zirconium (Zr), % 0.080 to 0.25
0 to 0.010
Residuals, % 0 to 0.15
0