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7475 Aluminum vs. ACI-ASTM CC50 Steel

7475 aluminum belongs to the aluminum alloys classification, while ACI-ASTM CC50 steel belongs to the iron alloys. There are 24 material properties with values for both materials. Properties with values for just one material (9, 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 7475 aluminum and the bottom bar is ACI-ASTM CC50 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 70
200
Poisson's Ratio 0.32
0.27
Shear Modulus, GPa 26
80
Tensile Strength: Ultimate (UTS), MPa 530 to 590
430

Thermal Properties

Latent Heat of Fusion, J/g 380
300
Maximum Temperature: Mechanical, °C 180
1100
Melting Completion (Liquidus), °C 640
1420
Melting Onset (Solidus), °C 480
1370
Specific Heat Capacity, J/kg-K 870
490
Thermal Conductivity, W/m-K 140 to 160
17
Thermal Expansion, µm/m-K 23
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 33 to 42
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 98 to 120
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 10
14
Density, g/cm3 3.0
7.6
Embodied Carbon, kg CO2/kg material 8.2
2.7
Embodied Energy, MJ/kg 150
39
Embodied Water, L/kg 1130
170

Common Calculations

Stiffness to Weight: Axial, points 13
15
Stiffness to Weight: Bending, points 46
26
Strength to Weight: Axial, points 49 to 55
16
Strength to Weight: Bending, points 48 to 52
17
Thermal Diffusivity, mm2/s 53 to 63
4.5
Thermal Shock Resistance, points 23 to 26
14

Alloy Composition

Aluminum (Al), % 88.6 to 91.6
0
Carbon (C), % 0
0 to 0.5
Chromium (Cr), % 0.18 to 0.25
26 to 30
Copper (Cu), % 1.2 to 1.9
0
Iron (Fe), % 0 to 0.12
62.9 to 74
Magnesium (Mg), % 1.9 to 2.6
0
Manganese (Mn), % 0 to 0.060
0 to 1.0
Nickel (Ni), % 0
0 to 4.0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.1
0 to 1.5
Sulfur (S), % 0
0 to 0.040
Titanium (Ti), % 0 to 0.060
0
Zinc (Zn), % 5.1 to 6.2
0
Residuals, % 0 to 0.15
0