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B443.0 Aluminum vs. SAE-AISI 4140 Steel

B443.0 aluminum belongs to the aluminum alloys classification, while SAE-AISI 4140 steel belongs to the iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (1, 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 B443.0 aluminum and the bottom bar is SAE-AISI 4140 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 43
200 to 310
Elastic (Young's, Tensile) Modulus, GPa 70
190
Elongation at Break, % 4.9
11 to 26
Fatigue Strength, MPa 55
360 to 650
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
73
Shear Strength, MPa 110
410 to 660
Tensile Strength: Ultimate (UTS), MPa 150
690 to 1080
Tensile Strength: Yield (Proof), MPa 50
590 to 990

Thermal Properties

Latent Heat of Fusion, J/g 470
250
Maximum Temperature: Mechanical, °C 170
420
Melting Completion (Liquidus), °C 620
1460
Melting Onset (Solidus), °C 600
1420
Specific Heat Capacity, J/kg-K 900
470
Thermal Conductivity, W/m-K 150
43
Thermal Expansion, µm/m-K 22
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 38
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 130
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
2.4
Density, g/cm3 2.7
7.8
Embodied Carbon, kg CO2/kg material 8.0
1.5
Embodied Energy, MJ/kg 150
20
Embodied Water, L/kg 1130
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 5.6
74 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 18
920 to 2590
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 52
24
Strength to Weight: Axial, points 15
25 to 38
Strength to Weight: Bending, points 23
22 to 30
Thermal Diffusivity, mm2/s 61
12
Thermal Shock Resistance, points 6.8
20 to 32

Alloy Composition

Aluminum (Al), % 91.9 to 95.5
0
Carbon (C), % 0
0.38 to 0.43
Chromium (Cr), % 0
0.8 to 1.1
Copper (Cu), % 0 to 0.15
0
Iron (Fe), % 0 to 0.8
96.8 to 97.8
Magnesium (Mg), % 0 to 0.050
0
Manganese (Mn), % 0 to 0.35
0.75 to 1.0
Molybdenum (Mo), % 0
0.15 to 0.25
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 4.5 to 6.0
0.15 to 0.35
Sulfur (S), % 0
0 to 0.040
Titanium (Ti), % 0 to 0.25
0
Zinc (Zn), % 0 to 0.35
0
Residuals, % 0 to 0.15
0