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SAE-AISI 4718 Steel vs. 7076 Aluminum

SAE-AISI 4718 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 4718 steel and the bottom bar is 7076 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
160
Elastic (Young's, Tensile) Modulus, GPa 190
70
Elongation at Break, % 24
6.2
Fatigue Strength, MPa 270
170
Poisson's Ratio 0.29
0.32
Shear Modulus, GPa 73
27
Shear Strength, MPa 330
310
Tensile Strength: Ultimate (UTS), MPa 510
530
Tensile Strength: Yield (Proof), MPa 370
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 39
140
Thermal Expansion, µm/m-K 11
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 3.0
9.5
Density, g/cm3 7.9
3.0
Embodied Carbon, kg CO2/kg material 1.6
8.0
Embodied Energy, MJ/kg 21
150
Embodied Water, L/kg 51
1110

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
31
Resilience: Unit (Modulus of Resilience), kJ/m3 360
1510
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
45
Strength to Weight: Axial, points 18
49
Strength to Weight: Bending, points 18
48
Thermal Diffusivity, mm2/s 10
54
Thermal Shock Resistance, points 17
23

Alloy Composition

Aluminum (Al), % 0
86.9 to 91.2
Carbon (C), % 0.16 to 0.21
0
Chromium (Cr), % 0.35 to 0.55
0
Copper (Cu), % 0
0.3 to 1.0
Iron (Fe), % 96.3 to 97.4
0 to 0.6
Magnesium (Mg), % 0
1.2 to 2.0
Manganese (Mn), % 0.7 to 0.9
0.3 to 0.8
Molybdenum (Mo), % 0.3 to 0.4
0
Nickel (Ni), % 0.9 to 1.2
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