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4145 Aluminum vs. SAE-AISI 6150 Steel

4145 aluminum belongs to the aluminum alloys classification, while SAE-AISI 6150 steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (2, 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 6150 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
190
Elongation at Break, % 2.2
15 to 23
Fatigue Strength, MPa 48
300 to 750
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 28
73
Shear Strength, MPa 69
400 to 730
Tensile Strength: Ultimate (UTS), MPa 120
630 to 1200
Tensile Strength: Yield (Proof), MPa 68
420 to 1160

Thermal Properties

Latent Heat of Fusion, J/g 540
250
Maximum Temperature: Mechanical, °C 160
420
Melting Completion (Liquidus), °C 590
1460
Melting Onset (Solidus), °C 520
1410
Specific Heat Capacity, J/kg-K 880
470
Thermal Conductivity, W/m-K 100
46
Thermal Expansion, µm/m-K 21
12 to 13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 26
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 84
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 10
2.3
Density, g/cm3 2.8
7.8
Embodied Carbon, kg CO2/kg material 7.6
2.0
Embodied Energy, MJ/kg 140
28
Embodied Water, L/kg 1040
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.3
130 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 31
460 to 3590
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 50
24
Strength to Weight: Axial, points 12
22 to 43
Strength to Weight: Bending, points 19
21 to 32
Thermal Diffusivity, mm2/s 42
13
Thermal Shock Resistance, points 5.5
20 to 38

Alloy Composition


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Aluminum (Al), % 83 to 87.4
0
Carbon (C), % 0
0.48 to 0.53
Chromium (Cr), % 0 to 0.15
0.8 to 1.1
Copper (Cu), % 3.3 to 4.7
0
Iron (Fe), % 0 to 0.8
96.7 to 97.7
Magnesium (Mg), % 0 to 0.15
0
Manganese (Mn), % 0 to 0.15
0.7 to 0.9
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 9.3 to 10.7
0.15 to 0.35
Sulfur (S), % 0
0 to 0.040
Vanadium (V), % 0
0.15 to 0.3
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.15
0