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2025 Aluminum vs. SAE-AISI H25 Steel

2025 aluminum belongs to the aluminum alloys classification, while SAE-AISI H25 steel belongs to the iron alloys. There are 21 material properties with values for both materials. Properties with values for just one material (11, 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 SAE-AISI H25 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 72
200
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 27
79
Tensile Strength: Ultimate (UTS), MPa 400
710 to 1620

Thermal Properties

Latent Heat of Fusion, J/g 400
250
Melting Completion (Liquidus), °C 640
1750
Melting Onset (Solidus), °C 520
1700
Specific Heat Capacity, J/kg-K 870
420
Thermal Conductivity, W/m-K 150
26
Thermal Expansion, µm/m-K 23
12

Otherwise Unclassified Properties

Base Metal Price, % relative 10
38
Density, g/cm3 3.0
9.1
Embodied Carbon, kg CO2/kg material 7.9
6.2
Embodied Energy, MJ/kg 150
93
Embodied Water, L/kg 1130
83

Common Calculations

Stiffness to Weight: Axial, points 13
12
Stiffness to Weight: Bending, points 46
22
Strength to Weight: Axial, points 37
22 to 50
Strength to Weight: Bending, points 40
20 to 34
Thermal Diffusivity, mm2/s 58
6.7
Thermal Shock Resistance, points 18
22 to 49

Alloy Composition

Aluminum (Al), % 90.9 to 95.2
0
Carbon (C), % 0
0.22 to 0.32
Chromium (Cr), % 0 to 0.1
3.8 to 4.5
Copper (Cu), % 3.9 to 5.0
0 to 0.25
Iron (Fe), % 0 to 1.0
77.2 to 81.3
Magnesium (Mg), % 0 to 0.050
0
Manganese (Mn), % 0.4 to 1.2
0.15 to 0.4
Nickel (Ni), % 0
0 to 0.3
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0.5 to 1.2
0.15 to 0.4
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.15
0
Tungsten (W), % 0
14 to 16
Vanadium (V), % 0
0.4 to 0.6
Zinc (Zn), % 0 to 0.25
0
Residuals, % 0 to 0.15
0