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4145 Aluminum vs. SAE-AISI H25 Steel

4145 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 4145 aluminum and the bottom bar is SAE-AISI H25 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
200
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 28
79
Tensile Strength: Ultimate (UTS), MPa 120
710 to 1620

Thermal Properties

Latent Heat of Fusion, J/g 540
250
Melting Completion (Liquidus), °C 590
1750
Melting Onset (Solidus), °C 520
1700
Specific Heat Capacity, J/kg-K 880
420
Thermal Conductivity, W/m-K 100
26
Thermal Expansion, µm/m-K 21
12

Otherwise Unclassified Properties

Base Metal Price, % relative 10
38
Density, g/cm3 2.8
9.1
Embodied Carbon, kg CO2/kg material 7.6
6.2
Embodied Energy, MJ/kg 140
93
Embodied Water, L/kg 1040
83

Common Calculations

Stiffness to Weight: Axial, points 14
12
Stiffness to Weight: Bending, points 50
22
Strength to Weight: Axial, points 12
22 to 50
Strength to Weight: Bending, points 19
20 to 34
Thermal Diffusivity, mm2/s 42
6.7
Thermal Shock Resistance, points 5.5
22 to 49

Alloy Composition


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Aluminum (Al), % 83 to 87.4
0
Carbon (C), % 0
0.22 to 0.32
Chromium (Cr), % 0 to 0.15
3.8 to 4.5
Copper (Cu), % 3.3 to 4.7
0 to 0.25
Iron (Fe), % 0 to 0.8
77.2 to 81.3
Magnesium (Mg), % 0 to 0.15
0
Manganese (Mn), % 0 to 0.15
0.15 to 0.4
Nickel (Ni), % 0
0 to 0.3
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 9.3 to 10.7
0.15 to 0.4
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 0
14 to 16
Vanadium (V), % 0
0.4 to 0.6
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.15
0