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SAE-AISI 4150 Steel vs. 772.0 Aluminum

SAE-AISI 4150 steel belongs to the iron alloys classification, while 772.0 aluminum belongs to the aluminum alloys. There are 29 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 SAE-AISI 4150 steel and the bottom bar is 772.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
69
Elongation at Break, % 12 to 20
6.3 to 8.4
Fatigue Strength, MPa 260 to 780
94 to 160
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 73
26
Tensile Strength: Ultimate (UTS), MPa 660 to 1310
260 to 320
Tensile Strength: Yield (Proof), MPa 380 to 1220
220 to 250

Thermal Properties

Latent Heat of Fusion, J/g 250
380
Maximum Temperature: Mechanical, °C 420
180
Melting Completion (Liquidus), °C 1460
630
Melting Onset (Solidus), °C 1420
580
Specific Heat Capacity, J/kg-K 470
870
Thermal Conductivity, W/m-K 42
150
Thermal Expansion, µm/m-K 13
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
35
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
110

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
9.5
Density, g/cm3 7.8
3.0
Embodied Carbon, kg CO2/kg material 1.5
8.0
Embodied Energy, MJ/kg 20
150
Embodied Water, L/kg 51
1140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 82 to 180
16 to 25
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 3930
350 to 430
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
46
Strength to Weight: Axial, points 24 to 47
25 to 31
Strength to Weight: Bending, points 22 to 34
31 to 36
Thermal Diffusivity, mm2/s 11
58
Thermal Shock Resistance, points 19 to 39
11 to 14

Alloy Composition

Aluminum (Al), % 0
91.2 to 93.2
Carbon (C), % 0.48 to 0.53
0
Chromium (Cr), % 0.8 to 1.1
0.060 to 0.2
Copper (Cu), % 0
0 to 0.1
Iron (Fe), % 96.7 to 97.7
0 to 0.15
Magnesium (Mg), % 0
0.6 to 0.8
Manganese (Mn), % 0.75 to 1.0
0 to 0.1
Molybdenum (Mo), % 0.15 to 0.25
0
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0.15 to 0.35
0 to 0.15
Sulfur (S), % 0 to 0.040
0
Titanium (Ti), % 0
0.1 to 0.2
Zinc (Zn), % 0
6.0 to 7.0
Residuals, % 0
0 to 0.15