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2618 Aluminum vs. SAE-AISI 5130 Steel

2618 aluminum belongs to the aluminum alloys classification, while SAE-AISI 5130 steel belongs to the iron 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 2618 aluminum and the bottom bar is SAE-AISI 5130 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 120
150 to 190
Elastic (Young's, Tensile) Modulus, GPa 71
190
Elongation at Break, % 5.8
12 to 22
Fatigue Strength, MPa 110
230 to 330
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 27
73
Shear Strength, MPa 260
310 to 390
Tensile Strength: Ultimate (UTS), MPa 420
500 to 640
Tensile Strength: Yield (Proof), MPa 350
330 to 530

Thermal Properties

Latent Heat of Fusion, J/g 390
250
Maximum Temperature: Mechanical, °C 210
420
Melting Completion (Liquidus), °C 640
1460
Melting Onset (Solidus), °C 550
1420
Specific Heat Capacity, J/kg-K 880
470
Thermal Conductivity, W/m-K 160
45
Thermal Expansion, µm/m-K 22
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 37
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 110
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 11
2.2
Density, g/cm3 2.9
7.8
Embodied Carbon, kg CO2/kg material 8.3
1.4
Embodied Energy, MJ/kg 150
19
Embodied Water, L/kg 1150
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 23
74 to 98
Resilience: Unit (Modulus of Resilience), kJ/m3 850
290 to 750
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 47
24
Strength to Weight: Axial, points 40
18 to 23
Strength to Weight: Bending, points 42
18 to 21
Thermal Diffusivity, mm2/s 62
12
Thermal Shock Resistance, points 19
16 to 20

Alloy Composition

Aluminum (Al), % 92.4 to 94.9
0
Carbon (C), % 0
0.28 to 0.33
Chromium (Cr), % 0
0.8 to 1.1
Copper (Cu), % 1.9 to 2.7
0
Iron (Fe), % 0.9 to 1.3
97.2 to 98.1
Magnesium (Mg), % 1.3 to 1.8
0
Manganese (Mn), % 0
0.7 to 0.9
Nickel (Ni), % 0.9 to 1.2
0
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0.1 to 0.25
0.15 to 0.35
Sulfur (S), % 0
0 to 0.040
Titanium (Ti), % 0.040 to 0.1
0
Zinc (Zn), % 0 to 0.1
0
Residuals, % 0 to 0.15
0