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7021 Aluminum vs. ASTM A369 Grade FP12

7021 aluminum belongs to the aluminum alloys classification, while ASTM A369 grade FP12 belongs to the iron 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 7021 aluminum and the bottom bar is ASTM A369 grade FP12.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
190
Elongation at Break, % 9.4
20
Fatigue Strength, MPa 150
170
Poisson's Ratio 0.32
0.29
Shear Modulus, GPa 26
73
Shear Strength, MPa 270
300
Tensile Strength: Ultimate (UTS), MPa 460
470
Tensile Strength: Yield (Proof), MPa 390
250

Thermal Properties

Latent Heat of Fusion, J/g 380
250
Maximum Temperature: Mechanical, °C 200
430
Melting Completion (Liquidus), °C 630
1470
Melting Onset (Solidus), °C 510
1430
Specific Heat Capacity, J/kg-K 870
470
Thermal Conductivity, W/m-K 150
45
Thermal Expansion, µm/m-K 24
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 38
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 120
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
2.8
Density, g/cm3 2.9
7.9
Embodied Carbon, kg CO2/kg material 8.3
1.6
Embodied Energy, MJ/kg 150
21
Embodied Water, L/kg 1140
52

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 41
81
Resilience: Unit (Modulus of Resilience), kJ/m3 1110
160
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 47
24
Strength to Weight: Axial, points 44
17
Strength to Weight: Bending, points 45
17
Thermal Diffusivity, mm2/s 59
12
Thermal Shock Resistance, points 20
14

Alloy Composition

Aluminum (Al), % 90.7 to 93.7
0
Carbon (C), % 0
0.050 to 0.15
Chromium (Cr), % 0 to 0.050
0.8 to 1.3
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 0 to 0.4
96.8 to 98.4
Magnesium (Mg), % 1.2 to 1.8
0
Manganese (Mn), % 0 to 0.1
0.3 to 0.61
Molybdenum (Mo), % 0
0.44 to 0.65
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0 to 0.25
0 to 0.5
Sulfur (S), % 0
0 to 0.025
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