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ACI-ASTM CD3MCuN Steel vs. 7175 Aluminum

ACI-ASTM CD3MCuN steel belongs to the iron alloys classification, while 7175 aluminum belongs to the aluminum alloys. There are 29 material properties with values for both materials. Properties with values for just one material (3, 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 CD3MCuN steel and the bottom bar is 7175 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
70
Elongation at Break, % 29
3.8 to 5.9
Fatigue Strength, MPa 370
150 to 180
Poisson's Ratio 0.27
0.32
Shear Modulus, GPa 80
26
Tensile Strength: Ultimate (UTS), MPa 790
520 to 570
Tensile Strength: Yield (Proof), MPa 500
430 to 490

Thermal Properties

Latent Heat of Fusion, J/g 300
380
Maximum Temperature: Mechanical, °C 1100
180
Melting Completion (Liquidus), °C 1440
640
Melting Onset (Solidus), °C 1390
480
Specific Heat Capacity, J/kg-K 480
870
Thermal Conductivity, W/m-K 15
140
Thermal Expansion, µm/m-K 13
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
33
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
99

Otherwise Unclassified Properties

Base Metal Price, % relative 20
10
Density, g/cm3 7.8
3.0
Embodied Carbon, kg CO2/kg material 3.9
8.2
Embodied Energy, MJ/kg 54
150
Embodied Water, L/kg 180
1130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200
18 to 29
Resilience: Unit (Modulus of Resilience), kJ/m3 620
1310 to 1730
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 25
46
Strength to Weight: Axial, points 28
48 to 52
Strength to Weight: Bending, points 24
48 to 51
Thermal Diffusivity, mm2/s 4.1
53
Thermal Shock Resistance, points 22
23 to 25

Alloy Composition

Aluminum (Al), % 0
88 to 91.4
Carbon (C), % 0 to 0.030
0
Chromium (Cr), % 24 to 26.7
0.18 to 0.28
Copper (Cu), % 1.4 to 1.9
1.2 to 2.0
Iron (Fe), % 58.2 to 65.9
0 to 0.2
Magnesium (Mg), % 0
2.1 to 2.9
Manganese (Mn), % 0 to 1.2
0 to 0.1
Molybdenum (Mo), % 2.9 to 3.8
0
Nickel (Ni), % 5.6 to 6.7
0
Nitrogen (N), % 0.22 to 0.33
0
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0 to 1.1
0 to 0.15
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
0 to 0.1
Zinc (Zn), % 0
5.1 to 6.1
Residuals, % 0
0 to 0.15