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4145 Aluminum vs. Grade FDSiCrV Steel

4145 aluminum belongs to the aluminum alloys classification, while grade FDSiCrV steel belongs to the iron alloys. There are 24 material properties with values for both materials. Properties with values for just one material (9, 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 grade FDSiCrV steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
190
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 28
80
Tensile Strength: Ultimate (UTS), MPa 120
2100

Thermal Properties

Latent Heat of Fusion, J/g 540
270
Maximum Temperature: Mechanical, °C 160
420
Melting Completion (Liquidus), °C 590
1440
Melting Onset (Solidus), °C 520
1400
Specific Heat Capacity, J/kg-K 880
480
Thermal Conductivity, W/m-K 100
47
Thermal Expansion, µm/m-K 21
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 26
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 84
8.6

Otherwise Unclassified Properties

Base Metal Price, % relative 10
2.3
Density, g/cm3 2.8
7.7
Embodied Carbon, kg CO2/kg material 7.6
1.9
Embodied Energy, MJ/kg 140
26
Embodied Water, L/kg 1040
50

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 50
25
Strength to Weight: Axial, points 12
75
Strength to Weight: Bending, points 19
47
Thermal Diffusivity, mm2/s 42
13
Thermal Shock Resistance, points 5.5
63

Alloy Composition


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Aluminum (Al), % 83 to 87.4
0
Carbon (C), % 0
0.5 to 0.7
Chromium (Cr), % 0 to 0.15
0.5 to 1.0
Copper (Cu), % 3.3 to 4.7
0 to 0.12
Iron (Fe), % 0 to 0.8
96 to 97.8
Magnesium (Mg), % 0 to 0.15
0
Manganese (Mn), % 0 to 0.15
0.4 to 0.9
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 9.3 to 10.7
1.2 to 1.7
Sulfur (S), % 0
0 to 0.025
Vanadium (V), % 0
0.1 to 0.25
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.15
0