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SAE-AISI 4150 Steel vs. 7076 Aluminum

SAE-AISI 4150 steel belongs to the iron alloys classification, while 7076 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 7076 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200 to 380
160
Elastic (Young's, Tensile) Modulus, GPa 190
70
Elongation at Break, % 12 to 20
6.2
Fatigue Strength, MPa 260 to 780
170
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 73
27
Shear Strength, MPa 410 to 800
310
Tensile Strength: Ultimate (UTS), MPa 660 to 1310
530
Tensile Strength: Yield (Proof), MPa 380 to 1220
460

Thermal Properties

Latent Heat of Fusion, J/g 250
380
Maximum Temperature: Mechanical, °C 420
170
Melting Completion (Liquidus), °C 1460
630
Melting Onset (Solidus), °C 1420
460
Specific Heat Capacity, J/kg-K 470
860
Thermal Conductivity, W/m-K 42
140
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
100

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
1110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 82 to 180
31
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 3930
1510
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
45
Strength to Weight: Axial, points 24 to 47
49
Strength to Weight: Bending, points 22 to 34
48
Thermal Diffusivity, mm2/s 11
54
Thermal Shock Resistance, points 19 to 39
23

Alloy Composition

Aluminum (Al), % 0
86.9 to 91.2
Carbon (C), % 0.48 to 0.53
0
Chromium (Cr), % 0.8 to 1.1
0
Copper (Cu), % 0
0.3 to 1.0
Iron (Fe), % 96.7 to 97.7
0 to 0.6
Magnesium (Mg), % 0
1.2 to 2.0
Manganese (Mn), % 0.75 to 1.0
0.3 to 0.8
Molybdenum (Mo), % 0.15 to 0.25
0
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0.15 to 0.35
0 to 0.4
Sulfur (S), % 0 to 0.040
0
Titanium (Ti), % 0
0 to 0.2
Zinc (Zn), % 0
7.0 to 8.0
Residuals, % 0
0 to 0.15