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EN AC-51100 Aluminum vs. SAE-AISI 4718 Steel

EN AC-51100 aluminum belongs to the aluminum alloys classification, while SAE-AISI 4718 steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (1, 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 EN AC-51100 aluminum and the bottom bar is SAE-AISI 4718 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 57
150
Elastic (Young's, Tensile) Modulus, GPa 68
190
Elongation at Break, % 4.5
24
Fatigue Strength, MPa 58
270
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 26
73
Tensile Strength: Ultimate (UTS), MPa 160
510
Tensile Strength: Yield (Proof), MPa 80
370

Thermal Properties

Latent Heat of Fusion, J/g 400
250
Maximum Temperature: Mechanical, °C 170
420
Melting Completion (Liquidus), °C 640
1460
Melting Onset (Solidus), °C 620
1420
Specific Heat Capacity, J/kg-K 900
470
Thermal Conductivity, W/m-K 130
39
Thermal Expansion, µm/m-K 23
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 34
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 110
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
3.0
Density, g/cm3 2.7
7.9
Embodied Carbon, kg CO2/kg material 8.7
1.6
Embodied Energy, MJ/kg 150
21
Embodied Water, L/kg 1180
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 6.0
110
Resilience: Unit (Modulus of Resilience), kJ/m3 47
360
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 51
24
Strength to Weight: Axial, points 17
18
Strength to Weight: Bending, points 25
18
Thermal Diffusivity, mm2/s 53
10
Thermal Shock Resistance, points 7.3
17

Alloy Composition

Aluminum (Al), % 94.5 to 97.5
0
Carbon (C), % 0
0.16 to 0.21
Chromium (Cr), % 0
0.35 to 0.55
Copper (Cu), % 0 to 0.050
0
Iron (Fe), % 0 to 0.55
96.3 to 97.4
Magnesium (Mg), % 2.5 to 3.5
0
Manganese (Mn), % 0 to 0.45
0.7 to 0.9
Molybdenum (Mo), % 0
0.3 to 0.4
Nickel (Ni), % 0
0.9 to 1.2
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0 to 0.55
0.15 to 0.35
Sulfur (S), % 0
0 to 0.040
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 0 to 0.1
0
Residuals, % 0 to 0.15
0