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2618 Aluminum vs. ASTM A299 Steel

2618 aluminum belongs to the aluminum alloys classification, while ASTM A299 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 ASTM A299 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 120
180 to 190
Elastic (Young's, Tensile) Modulus, GPa 71
190
Elongation at Break, % 5.8
21 to 22
Fatigue Strength, MPa 110
230 to 250
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 27
73
Shear Strength, MPa 260
370 to 390
Tensile Strength: Ultimate (UTS), MPa 420
590 to 620
Tensile Strength: Yield (Proof), MPa 350
330 to 360

Thermal Properties

Latent Heat of Fusion, J/g 390
250
Maximum Temperature: Mechanical, °C 210
400
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
51
Thermal Expansion, µm/m-K 22
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 37
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 110
8.2

Otherwise Unclassified Properties

Base Metal Price, % relative 11
1.9
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
47

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 23
110
Resilience: Unit (Modulus of Resilience), kJ/m3 850
290 to 350
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 47
24
Strength to Weight: Axial, points 40
21 to 22
Strength to Weight: Bending, points 42
20 to 21
Thermal Diffusivity, mm2/s 62
14
Thermal Shock Resistance, points 19
17 to 18