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ACI-ASTM CF20 Steel vs. 7175 Aluminum

ACI-ASTM CF20 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 (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 CF20 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, % 50
3.8 to 5.9
Fatigue Strength, MPa 240
150 to 180
Poisson's Ratio 0.28
0.32
Shear Modulus, GPa 77
26
Tensile Strength: Ultimate (UTS), MPa 530
520 to 570
Tensile Strength: Yield (Proof), MPa 250
430 to 490

Thermal Properties

Latent Heat of Fusion, J/g 300
380
Maximum Temperature: Mechanical, °C 970
180
Melting Completion (Liquidus), °C 1420
640
Melting Onset (Solidus), °C 1410
480
Specific Heat Capacity, J/kg-K 480
870
Thermal Conductivity, W/m-K 16
140
Thermal Expansion, µm/m-K 17
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
33
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
99

Otherwise Unclassified Properties

Base Metal Price, % relative 16
10
Density, g/cm3 7.8
3.0
Embodied Carbon, kg CO2/kg material 3.1
8.2
Embodied Energy, MJ/kg 44
150
Embodied Water, L/kg 150
1130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 220
18 to 29
Resilience: Unit (Modulus of Resilience), kJ/m3 160
1310 to 1730
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
46
Strength to Weight: Axial, points 19
48 to 52
Strength to Weight: Bending, points 19
48 to 51
Thermal Diffusivity, mm2/s 4.3
53
Thermal Shock Resistance, points 11
23 to 25

Alloy Composition

Aluminum (Al), % 0
88 to 91.4
Carbon (C), % 0 to 0.2
0
Chromium (Cr), % 18 to 21
0.18 to 0.28
Copper (Cu), % 0
1.2 to 2.0
Iron (Fe), % 64.2 to 74
0 to 0.2
Magnesium (Mg), % 0
2.1 to 2.9
Manganese (Mn), % 0 to 1.5
0 to 0.1
Nickel (Ni), % 8.0 to 11
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 2.0
0 to 0.15
Sulfur (S), % 0 to 0.040
0
Titanium (Ti), % 0
0 to 0.1
Zinc (Zn), % 0
5.1 to 6.1
Residuals, % 0
0 to 0.15