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ASTM A387 Grade 91 Class 2 vs. 7020 Aluminum

ASTM A387 grade 91 class 2 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 (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 ASTM A387 grade 91 class 2 and the bottom bar is 7020 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

Latent Heat of Fusion, J/g 270
380
Maximum Temperature: Mechanical, °C 600
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 26
150
Thermal Expansion, µm/m-K 13
23

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

Alloy Composition

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