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2218 Aluminum vs. ASTM A27 Cast Steel

2218 aluminum belongs to the aluminum alloys classification, while ASTM A27 cast steel belongs to the iron alloys. There are 29 material properties with values for both materials. Properties with values for just one material (3, 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 2218 aluminum and the bottom bar is ASTM A27 cast steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
190
Elongation at Break, % 6.8 to 10
25 to 27
Fatigue Strength, MPa 110
170 to 230
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 27
73
Tensile Strength: Ultimate (UTS), MPa 330 to 430
460 to 550
Tensile Strength: Yield (Proof), MPa 260 to 310
230 to 310

Thermal Properties

Latent Heat of Fusion, J/g 390
250
Maximum Temperature: Mechanical, °C 220
400
Melting Completion (Liquidus), °C 640
1460
Melting Onset (Solidus), °C 510
1420
Specific Heat Capacity, J/kg-K 870
470
Thermal Conductivity, W/m-K 140
52
Thermal Expansion, µm/m-K 22
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 37
7.0 to 7.1
Electrical Conductivity: Equal Weight (Specific), % IACS 110
8.1

Otherwise Unclassified Properties

Base Metal Price, % relative 11
1.8
Density, g/cm3 3.1
7.8
Embodied Carbon, kg CO2/kg material 8.2
1.4
Embodied Energy, MJ/kg 150
18
Embodied Water, L/kg 1130
45 to 46

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 27 to 31
96 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 450 to 650
140 to 260
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 45
24
Strength to Weight: Axial, points 30 to 39
16 to 20
Strength to Weight: Bending, points 34 to 41
17 to 19
Thermal Diffusivity, mm2/s 52
14
Thermal Shock Resistance, points 15 to 19
15 to 18