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324.0 Aluminum vs. SAE-AISI 81B45 Steel

324.0 aluminum belongs to the aluminum alloys classification, while SAE-AISI 81B45 steel belongs to the iron alloys. There are 29 material properties with values for both materials. Properties with values for just one material (2, 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 324.0 aluminum and the bottom bar is SAE-AISI 81B45 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
190
Elongation at Break, % 3.0 to 4.0
12 to 24
Fatigue Strength, MPa 77 to 89
250 to 350
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 27
73
Tensile Strength: Ultimate (UTS), MPa 210 to 310
540 to 670
Tensile Strength: Yield (Proof), MPa 110 to 270
350 to 560

Thermal Properties

Latent Heat of Fusion, J/g 500
250
Maximum Temperature: Mechanical, °C 170
410
Melting Completion (Liquidus), °C 610
1460
Melting Onset (Solidus), °C 550
1420
Specific Heat Capacity, J/kg-K 900
470
Thermal Conductivity, W/m-K 150
40
Thermal Expansion, µm/m-K 21
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 34
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 120
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
2.3
Density, g/cm3 2.7
7.8
Embodied Carbon, kg CO2/kg material 7.9
1.5
Embodied Energy, MJ/kg 150
20
Embodied Water, L/kg 1090
49

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 6.8 to 8.9
77 to 110
Resilience: Unit (Modulus of Resilience), kJ/m3 85 to 510
320 to 840
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 52
24
Strength to Weight: Axial, points 22 to 32
19 to 24
Strength to Weight: Bending, points 29 to 38
19 to 22
Thermal Diffusivity, mm2/s 62
11
Thermal Shock Resistance, points 9.7 to 14
17 to 21

Alloy Composition

Aluminum (Al), % 87.3 to 92.2
0
Boron (B), % 0
0.00050 to 0.0030
Carbon (C), % 0
0.43 to 0.48
Chromium (Cr), % 0
0.35 to 0.55
Copper (Cu), % 0.4 to 0.6
0
Iron (Fe), % 0 to 1.2
97 to 98
Magnesium (Mg), % 0.4 to 0.7
0
Manganese (Mn), % 0 to 0.5
0.75 to 1.0
Molybdenum (Mo), % 0
0.080 to 0.15
Nickel (Ni), % 0 to 0.3
0.2 to 0.4
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 7.0 to 8.0
0.15 to 0.35
Sulfur (S), % 0
0 to 0.040
Titanium (Ti), % 0 to 0.2
0
Zinc (Zn), % 0 to 1.0
0
Residuals, % 0 to 0.2
0