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ACI-ASTM CN3MN Steel vs. 7475 Aluminum

ACI-ASTM CN3MN steel belongs to the iron alloys classification, while 7475 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 CN3MN steel and the bottom bar is 7475 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
70
Elongation at Break, % 39
10 to 12
Fatigue Strength, MPa 250
190 to 210
Poisson's Ratio 0.28
0.32
Shear Modulus, GPa 80
26
Tensile Strength: Ultimate (UTS), MPa 620
530 to 590
Tensile Strength: Yield (Proof), MPa 300
440 to 520

Thermal Properties

Latent Heat of Fusion, J/g 310
380
Maximum Temperature: Mechanical, °C 1100
180
Melting Completion (Liquidus), °C 1460
640
Melting Onset (Solidus), °C 1410
480
Specific Heat Capacity, J/kg-K 460
870
Thermal Conductivity, W/m-K 13
140 to 160
Thermal Expansion, µm/m-K 16
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.8
33 to 42
Electrical Conductivity: Equal Weight (Specific), % IACS 2.0
98 to 120

Otherwise Unclassified Properties

Base Metal Price, % relative 33
10
Density, g/cm3 8.1
3.0
Embodied Carbon, kg CO2/kg material 6.2
8.2
Embodied Energy, MJ/kg 84
150
Embodied Water, L/kg 200
1130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200
53 to 68
Resilience: Unit (Modulus of Resilience), kJ/m3 210
1390 to 1920
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
46
Strength to Weight: Axial, points 21
49 to 55
Strength to Weight: Bending, points 20
48 to 52
Thermal Diffusivity, mm2/s 3.4
53 to 63
Thermal Shock Resistance, points 14
23 to 26

Alloy Composition


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Aluminum (Al), % 0
88.6 to 91.6
Carbon (C), % 0 to 0.030
0
Chromium (Cr), % 20 to 22
0.18 to 0.25
Copper (Cu), % 0 to 0.75
1.2 to 1.9
Iron (Fe), % 41.4 to 50.3
0 to 0.12
Magnesium (Mg), % 0
1.9 to 2.6
Manganese (Mn), % 0 to 2.0
0 to 0.060
Molybdenum (Mo), % 6.0 to 7.0
0
Nickel (Ni), % 23.5 to 25.5
0
Nitrogen (N), % 0.18 to 0.26
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 0.1
Sulfur (S), % 0 to 0.010
0
Titanium (Ti), % 0
0 to 0.060
Zinc (Zn), % 0
5.1 to 6.2
Residuals, % 0
0 to 0.15