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384.0 Aluminum vs. SAE-AISI 4150 Steel

384.0 aluminum belongs to the aluminum alloys classification, while SAE-AISI 4150 steel belongs to the iron alloys. 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 384.0 aluminum and the bottom bar is SAE-AISI 4150 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 85
200 to 380
Elastic (Young's, Tensile) Modulus, GPa 74
190
Elongation at Break, % 2.5
12 to 20
Fatigue Strength, MPa 140
260 to 780
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 28
73
Shear Strength, MPa 200
410 to 800
Tensile Strength: Ultimate (UTS), MPa 330
660 to 1310
Tensile Strength: Yield (Proof), MPa 170
380 to 1220

Thermal Properties

Latent Heat of Fusion, J/g 550
250
Maximum Temperature: Mechanical, °C 170
420
Melting Completion (Liquidus), °C 580
1460
Melting Onset (Solidus), °C 530
1420
Specific Heat Capacity, J/kg-K 870
470
Thermal Conductivity, W/m-K 96
42
Thermal Expansion, µm/m-K 21
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 22
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 69
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 11
2.4
Density, g/cm3 2.9
7.8
Embodied Carbon, kg CO2/kg material 7.4
1.5
Embodied Energy, MJ/kg 140
20
Embodied Water, L/kg 1010
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 6.9
82 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 190
380 to 3930
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 49
24
Strength to Weight: Axial, points 32
24 to 47
Strength to Weight: Bending, points 37
22 to 34
Thermal Diffusivity, mm2/s 39
11
Thermal Shock Resistance, points 15
19 to 39

Alloy Composition

Aluminum (Al), % 77.3 to 86.5
0
Carbon (C), % 0
0.48 to 0.53
Chromium (Cr), % 0
0.8 to 1.1
Copper (Cu), % 3.0 to 4.5
0
Iron (Fe), % 0 to 1.3
96.7 to 97.7
Magnesium (Mg), % 0 to 0.1
0
Manganese (Mn), % 0 to 0.5
0.75 to 1.0
Molybdenum (Mo), % 0
0.15 to 0.25
Nickel (Ni), % 0 to 0.5
0
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 10.5 to 12
0.15 to 0.35
Sulfur (S), % 0
0 to 0.040
Tin (Sn), % 0 to 0.35
0
Zinc (Zn), % 0 to 3.0
0
Residuals, % 0 to 0.5
0