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2018 Aluminum vs. ASTM A372 Grade E Steel

2018 aluminum belongs to the aluminum alloys classification, while ASTM A372 grade E 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 2018 aluminum and the bottom bar is ASTM A372 grade E steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 120
200 to 280
Elastic (Young's, Tensile) Modulus, GPa 73
190
Elongation at Break, % 9.6
20 to 22
Fatigue Strength, MPa 120
310 to 380
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 27
73
Shear Strength, MPa 270
410 to 570
Tensile Strength: Ultimate (UTS), MPa 420
650 to 910
Tensile Strength: Yield (Proof), MPa 310
430 to 550

Thermal Properties

Latent Heat of Fusion, J/g 390
250
Maximum Temperature: Mechanical, °C 220
420
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 150
44
Thermal Expansion, µm/m-K 22
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 120
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 11
2.4
Density, g/cm3 3.1
7.8
Embodied Carbon, kg CO2/kg material 8.1
1.5
Embodied Energy, MJ/kg 150
20
Embodied Water, L/kg 1130
51

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 37
130 to 160
Resilience: Unit (Modulus of Resilience), kJ/m3 670
500 to 810
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 45
24
Strength to Weight: Axial, points 38
23 to 32
Strength to Weight: Bending, points 41
21 to 27
Thermal Diffusivity, mm2/s 57
12
Thermal Shock Resistance, points 19
19 to 27

Alloy Composition

Aluminum (Al), % 89.7 to 94.4
0
Carbon (C), % 0
0.25 to 0.35
Chromium (Cr), % 0 to 0.1
0.8 to 1.2
Copper (Cu), % 3.5 to 4.5
0
Iron (Fe), % 0 to 1.0
97 to 98.3
Magnesium (Mg), % 0.45 to 0.9
0
Manganese (Mn), % 0 to 0.2
0.4 to 0.9
Molybdenum (Mo), % 0
0.15 to 0.25
Nickel (Ni), % 1.7 to 2.3
0
Phosphorus (P), % 0
0 to 0.015
Silicon (Si), % 0 to 0.9
0.15 to 0.35
Sulfur (S), % 0
0 to 0.010
Zinc (Zn), % 0 to 0.25
0
Residuals, % 0 to 0.15
0