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2618A Aluminum vs. ACI-ASTM CT15C Steel

2618A aluminum belongs to the aluminum alloys classification, while ACI-ASTM CT15C 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 2618A aluminum and the bottom bar is ACI-ASTM CT15C steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 72
200
Elongation at Break, % 4.5
23
Fatigue Strength, MPa 120
130
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 27
76
Tensile Strength: Ultimate (UTS), MPa 440
500
Tensile Strength: Yield (Proof), MPa 410
190

Thermal Properties

Latent Heat of Fusion, J/g 390
310
Maximum Temperature: Mechanical, °C 230
1080
Melting Completion (Liquidus), °C 670
1410
Melting Onset (Solidus), °C 560
1360
Specific Heat Capacity, J/kg-K 880
470
Thermal Conductivity, W/m-K 150
12
Thermal Expansion, µm/m-K 23
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 37
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 110
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 11
36
Density, g/cm3 3.0
8.0
Embodied Carbon, kg CO2/kg material 8.4
6.1
Embodied Energy, MJ/kg 150
88
Embodied Water, L/kg 1150
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 19
90
Resilience: Unit (Modulus of Resilience), kJ/m3 1180
93
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 47
24
Strength to Weight: Axial, points 41
17
Strength to Weight: Bending, points 44
17
Thermal Diffusivity, mm2/s 59
3.2
Thermal Shock Resistance, points 19
12

Alloy Composition

Aluminum (Al), % 91.5 to 95.2
0
Carbon (C), % 0
0.050 to 0.15
Chromium (Cr), % 0
19 to 21
Copper (Cu), % 1.8 to 2.7
0
Iron (Fe), % 0.9 to 1.4
40.3 to 49.2
Magnesium (Mg), % 1.2 to 1.8
0
Manganese (Mn), % 0 to 0.25
0.15 to 1.5
Nickel (Ni), % 0.8 to 1.4
31 to 34
Niobium (Nb), % 0
0.5 to 1.5
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0.15 to 0.25
0.15 to 1.5
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 0 to 0.15
0
Zirconium (Zr), % 0 to 0.25
0
Residuals, % 0 to 0.15
0