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7108 Aluminum vs. ACI-ASTM CN7M Steel

7108 aluminum belongs to the aluminum alloys classification, while ACI-ASTM CN7M steel belongs to the iron 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 7108 aluminum and the bottom bar is ACI-ASTM CN7M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
200
Elongation at Break, % 11
44
Fatigue Strength, MPa 120
190
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 26
77
Tensile Strength: Ultimate (UTS), MPa 350
480
Tensile Strength: Yield (Proof), MPa 290
200

Thermal Properties

Latent Heat of Fusion, J/g 380
310
Maximum Temperature: Mechanical, °C 210
1100
Melting Completion (Liquidus), °C 630
1410
Melting Onset (Solidus), °C 530
1450
Specific Heat Capacity, J/kg-K 880
470
Thermal Conductivity, W/m-K 150
21
Thermal Expansion, µm/m-K 24
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 39
1.6
Electrical Conductivity: Equal Weight (Specific), % IACS 120
1.8

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
32
Density, g/cm3 2.9
8.1
Embodied Carbon, kg CO2/kg material 8.3
5.6
Embodied Energy, MJ/kg 150
78
Embodied Water, L/kg 1150
210

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 38
170
Resilience: Unit (Modulus of Resilience), kJ/m3 620
110
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 47
24
Strength to Weight: Axial, points 34
17
Strength to Weight: Bending, points 38
17
Thermal Diffusivity, mm2/s 59
5.6
Thermal Shock Resistance, points 16
12

Alloy Composition

Aluminum (Al), % 92.4 to 94.7
0
Carbon (C), % 0
0 to 0.070
Chromium (Cr), % 0
19 to 22
Copper (Cu), % 0 to 0.050
3.0 to 4.0
Iron (Fe), % 0 to 0.1
37.4 to 48.5
Magnesium (Mg), % 0.7 to 1.4
0
Manganese (Mn), % 0 to 0.050
0 to 1.5
Molybdenum (Mo), % 0
2.0 to 3.0
Nickel (Ni), % 0
27.5 to 30.5
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 0.050
0
Zinc (Zn), % 4.5 to 5.5
0
Zirconium (Zr), % 0.12 to 0.25
0
Residuals, % 0 to 0.15
0