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ACI-ASTM CA6N Steel vs. 7021 Aluminum

ACI-ASTM CA6N steel belongs to the iron alloys classification, while 7021 aluminum belongs to the aluminum 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 ACI-ASTM CA6N 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, % 17
9.4
Fatigue Strength, MPa 640
150
Poisson's Ratio 0.28
0.32
Shear Modulus, GPa 75
26
Tensile Strength: Ultimate (UTS), MPa 1080
460
Tensile Strength: Yield (Proof), MPa 1060
390

Thermal Properties

Latent Heat of Fusion, J/g 280
380
Maximum Temperature: Mechanical, °C 740
200
Melting Completion (Liquidus), °C 1440
630
Melting Onset (Solidus), °C 1400
510
Specific Heat Capacity, J/kg-K 480
870
Thermal Conductivity, W/m-K 23
150
Thermal Expansion, µm/m-K 9.9
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.6
38
Electrical Conductivity: Equal Weight (Specific), % IACS 3.0
120

Otherwise Unclassified Properties

Base Metal Price, % relative 11
9.5
Density, g/cm3 7.8
2.9
Embodied Carbon, kg CO2/kg material 2.5
8.3
Embodied Energy, MJ/kg 35
150
Embodied Water, L/kg 110
1140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 180
41
Resilience: Unit (Modulus of Resilience), kJ/m3 2900
1110
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
47
Strength to Weight: Axial, points 38
44
Strength to Weight: Bending, points 30
45
Thermal Diffusivity, mm2/s 6.1
59
Thermal Shock Resistance, points 40
20

Alloy Composition

Aluminum (Al), % 0
90.7 to 93.7
Carbon (C), % 0 to 0.060
0
Chromium (Cr), % 10.5 to 12.5
0 to 0.050
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 77.9 to 83.5
0 to 0.4
Magnesium (Mg), % 0
1.2 to 1.8
Manganese (Mn), % 0 to 0.5
0 to 0.1
Nickel (Ni), % 6.0 to 8.0
0
Phosphorus (P), % 0 to 0.020
0
Silicon (Si), % 0 to 1.0
0 to 0.25
Sulfur (S), % 0 to 0.020
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