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SAE-AISI 4150 Steel vs. 518.0 Aluminum

SAE-AISI 4150 steel belongs to the iron alloys classification, while 518.0 aluminum belongs to the aluminum 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 SAE-AISI 4150 steel and the bottom bar is 518.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200 to 380
80
Elastic (Young's, Tensile) Modulus, GPa 190
67
Elongation at Break, % 12 to 20
5.0
Fatigue Strength, MPa 260 to 780
140
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 73
25
Shear Strength, MPa 410 to 800
200
Tensile Strength: Ultimate (UTS), MPa 660 to 1310
310
Tensile Strength: Yield (Proof), MPa 380 to 1220
190

Thermal Properties

Latent Heat of Fusion, J/g 250
390
Maximum Temperature: Mechanical, °C 420
170
Melting Completion (Liquidus), °C 1460
620
Melting Onset (Solidus), °C 1420
560
Specific Heat Capacity, J/kg-K 470
900
Thermal Conductivity, W/m-K 42
98
Thermal Expansion, µm/m-K 13
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
24
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
81

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
9.5
Density, g/cm3 7.8
2.7
Embodied Carbon, kg CO2/kg material 1.5
9.4
Embodied Energy, MJ/kg 20
150
Embodied Water, L/kg 51
1160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 82 to 180
14
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 3930
270
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
51
Strength to Weight: Axial, points 24 to 47
32
Strength to Weight: Bending, points 22 to 34
38
Thermal Diffusivity, mm2/s 11
40
Thermal Shock Resistance, points 19 to 39
14

Alloy Composition

Aluminum (Al), % 0
88.1 to 92.5
Carbon (C), % 0.48 to 0.53
0
Chromium (Cr), % 0.8 to 1.1
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 96.7 to 97.7
0 to 1.8
Magnesium (Mg), % 0
7.5 to 8.5
Manganese (Mn), % 0.75 to 1.0
0 to 0.35
Molybdenum (Mo), % 0.15 to 0.25
0
Nickel (Ni), % 0
0 to 0.15
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0.15 to 0.35
0 to 0.35
Sulfur (S), % 0 to 0.040
0
Tin (Sn), % 0
0 to 0.15
Zinc (Zn), % 0
0 to 0.15
Residuals, % 0
0 to 0.25