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7178 Aluminum vs. ACI-ASTM CF10SMnN Steel

7178 aluminum belongs to the aluminum alloys classification, while ACI-ASTM CF10SMnN steel belongs to the iron alloys. There are 25 material properties with values for both materials. Properties with values for just one material (8, 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 7178 aluminum and the bottom bar is ACI-ASTM CF10SMnN steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
190
Elongation at Break, % 4.5 to 12
34
Fatigue Strength, MPa 120 to 210
260
Poisson's Ratio 0.32
0.28
Shear Modulus, GPa 27
75
Tensile Strength: Ultimate (UTS), MPa 240 to 640
660
Tensile Strength: Yield (Proof), MPa 120 to 560
330

Thermal Properties

Latent Heat of Fusion, J/g 370
340
Maximum Temperature: Mechanical, °C 180
900
Melting Completion (Liquidus), °C 630
1360
Melting Onset (Solidus), °C 480
1310
Specific Heat Capacity, J/kg-K 860
500
Thermal Expansion, µm/m-K 23
16

Otherwise Unclassified Properties

Base Metal Price, % relative 10
15
Density, g/cm3 3.1
7.5
Embodied Carbon, kg CO2/kg material 8.2
3.1
Embodied Energy, MJ/kg 150
45
Embodied Water, L/kg 1110
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 24 to 52
180
Resilience: Unit (Modulus of Resilience), kJ/m3 110 to 2220
280
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 45
26
Strength to Weight: Axial, points 21 to 58
24
Strength to Weight: Bending, points 28 to 54
22
Thermal Shock Resistance, points 10 to 28
15

Alloy Composition

Aluminum (Al), % 85.4 to 89.5
0
Carbon (C), % 0
0 to 0.1
Chromium (Cr), % 0.18 to 0.28
16 to 18
Copper (Cu), % 1.6 to 2.4
0
Iron (Fe), % 0 to 0.5
59.1 to 65.4
Magnesium (Mg), % 2.4 to 3.1
0
Manganese (Mn), % 0 to 0.3
7.0 to 9.0
Nickel (Ni), % 0
8.0 to 9.0
Nitrogen (N), % 0
0.080 to 0.18
Phosphorus (P), % 0
0 to 0.060
Silicon (Si), % 0 to 0.4
3.5 to 4.5
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 6.3 to 7.3
0
Residuals, % 0 to 0.15
0