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ACI-ASTM CF20 Steel vs. 7049 Aluminum

ACI-ASTM CF20 steel belongs to the iron alloys classification, while 7049 aluminum belongs to the aluminum alloys. There are 30 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 CF20 steel and the bottom bar is 7049 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 160
140
Elastic (Young's, Tensile) Modulus, GPa 200
70
Elongation at Break, % 50
6.2 to 7.0
Fatigue Strength, MPa 240
160 to 170
Poisson's Ratio 0.28
0.32
Shear Modulus, GPa 77
27
Tensile Strength: Ultimate (UTS), MPa 530
510 to 530
Tensile Strength: Yield (Proof), MPa 250
420 to 450

Thermal Properties

Latent Heat of Fusion, J/g 300
370
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
860
Thermal Conductivity, W/m-K 16
130
Thermal Expansion, µm/m-K 17
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
36
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
110

Otherwise Unclassified Properties

Base Metal Price, % relative 16
10
Density, g/cm3 7.8
3.1
Embodied Carbon, kg CO2/kg material 3.1
8.1
Embodied Energy, MJ/kg 44
140
Embodied Water, L/kg 150
1110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 220
31 to 34
Resilience: Unit (Modulus of Resilience), kJ/m3 160
1270 to 1440
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
45
Strength to Weight: Axial, points 19
46 to 47
Strength to Weight: Bending, points 19
46 to 47
Thermal Diffusivity, mm2/s 4.3
51
Thermal Shock Resistance, points 11
22 to 23

Alloy Composition

Aluminum (Al), % 0
85.7 to 89.5
Carbon (C), % 0 to 0.2
0
Chromium (Cr), % 18 to 21
0.1 to 0.22
Copper (Cu), % 0
1.2 to 1.9
Iron (Fe), % 64.2 to 74
0 to 0.35
Magnesium (Mg), % 0
2.0 to 2.9
Manganese (Mn), % 0 to 1.5
0 to 0.2
Nickel (Ni), % 8.0 to 11
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 2.0
0 to 0.25
Sulfur (S), % 0 to 0.040
0
Titanium (Ti), % 0
0 to 0.1
Zinc (Zn), % 0
7.2 to 8.2
Residuals, % 0
0 to 0.15