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2025 Aluminum vs. ACI-ASTM CT15C Steel

2025 aluminum belongs to the aluminum alloys classification, while ACI-ASTM CT15C steel belongs to the iron 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 2025 aluminum and the bottom bar is ACI-ASTM CT15C steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 110
140
Elastic (Young's, Tensile) Modulus, GPa 72
200
Elongation at Break, % 15
23
Fatigue Strength, MPa 130
130
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 27
76
Tensile Strength: Ultimate (UTS), MPa 400
500
Tensile Strength: Yield (Proof), MPa 260
190

Thermal Properties

Latent Heat of Fusion, J/g 400
310
Maximum Temperature: Mechanical, °C 190
1080
Melting Completion (Liquidus), °C 640
1410
Melting Onset (Solidus), °C 520
1360
Specific Heat Capacity, J/kg-K 870
470
Thermal Conductivity, W/m-K 150
12
Thermal Expansion, µm/m-K 23
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 120
1.9

Otherwise Unclassified Properties

Base Metal Price, % relative 10
36
Density, g/cm3 3.0
8.0
Embodied Carbon, kg CO2/kg material 7.9
6.1
Embodied Energy, MJ/kg 150
88
Embodied Water, L/kg 1130
190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 55
90
Resilience: Unit (Modulus of Resilience), kJ/m3 450
93
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 46
24
Strength to Weight: Axial, points 37
17
Strength to Weight: Bending, points 40
17
Thermal Diffusivity, mm2/s 58
3.2
Thermal Shock Resistance, points 18
12

Alloy Composition

Aluminum (Al), % 90.9 to 95.2
0
Carbon (C), % 0
0.050 to 0.15
Chromium (Cr), % 0 to 0.1
19 to 21
Copper (Cu), % 3.9 to 5.0
0
Iron (Fe), % 0 to 1.0
40.3 to 49.2
Magnesium (Mg), % 0 to 0.050
0
Manganese (Mn), % 0.4 to 1.2
0.15 to 1.5
Nickel (Ni), % 0
31 to 34
Niobium (Nb), % 0
0.5 to 1.5
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0.5 to 1.2
0.15 to 1.5
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.15
0
Zinc (Zn), % 0 to 0.25
0
Residuals, % 0 to 0.15
0