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2618 Aluminum vs. ASTM A204 Steel

2618 aluminum belongs to the aluminum alloys classification, while ASTM A204 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 A204 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 120
160 to 180
Elastic (Young's, Tensile) Modulus, GPa 71
190
Elongation at Break, % 5.8
18 to 22
Fatigue Strength, MPa 110
200 to 220
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 27
73
Shear Strength, MPa 260
330 to 360
Tensile Strength: Ultimate (UTS), MPa 420
520 to 590
Tensile Strength: Yield (Proof), MPa 350
290 to 330

Thermal Properties

Latent Heat of Fusion, J/g 390
250
Maximum Temperature: Mechanical, °C 210
410
Melting Completion (Liquidus), °C 640
1470
Melting Onset (Solidus), °C 550
1420 to 1430
Specific Heat Capacity, J/kg-K 880
470
Thermal Conductivity, W/m-K 160
52
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
2.4
Density, g/cm3 2.9
7.9
Embodied Carbon, kg CO2/kg material 8.3
1.5
Embodied Energy, MJ/kg 150
20
Embodied Water, L/kg 1150
47

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 23
90 to 95
Resilience: Unit (Modulus of Resilience), kJ/m3 850
220 to 290
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 47
24
Strength to Weight: Axial, points 40
18 to 21
Strength to Weight: Bending, points 42
18 to 20
Thermal Diffusivity, mm2/s 62
14
Thermal Shock Resistance, points 19
15 to 17