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4145 Aluminum vs. SAE-AISI A7 Steel

4145 aluminum belongs to the aluminum alloys classification, while SAE-AISI A7 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 A7 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
72
Tensile Strength: Ultimate (UTS), MPa 120
800 to 2150

Thermal Properties

Latent Heat of Fusion, J/g 540
260
Melting Completion (Liquidus), °C 590
1470
Melting Onset (Solidus), °C 520
1430
Specific Heat Capacity, J/kg-K 880
470
Thermal Conductivity, W/m-K 100
37
Thermal Expansion, µm/m-K 21
12

Otherwise Unclassified Properties

Base Metal Price, % relative 10
10
Density, g/cm3 2.8
7.7
Embodied Carbon, kg CO2/kg material 7.6
13
Embodied Energy, MJ/kg 140
200
Embodied Water, L/kg 1040
100

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 50
25
Strength to Weight: Axial, points 12
29 to 77
Strength to Weight: Bending, points 19
25 to 48
Thermal Diffusivity, mm2/s 42
10
Thermal Shock Resistance, points 5.5
27 to 72

Alloy Composition


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Aluminum (Al), % 83 to 87.4
0
Carbon (C), % 0
2.0 to 2.9
Chromium (Cr), % 0 to 0.15
5.0 to 5.8
Copper (Cu), % 3.3 to 4.7
0 to 0.25
Iron (Fe), % 0 to 0.8
81.4 to 87.7
Magnesium (Mg), % 0 to 0.15
0
Manganese (Mn), % 0 to 0.15
0 to 0.8
Molybdenum (Mo), % 0
0.9 to 1.4
Nickel (Ni), % 0
0 to 0.3
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 9.3 to 10.7
0 to 0.5
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 0
0.5 to 1.5
Vanadium (V), % 0
3.9 to 5.2
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.15
0