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SAE-AISI 5155 Steel vs. 5082 Aluminum

SAE-AISI 5155 steel belongs to the iron alloys classification, while 5082 aluminum belongs to the aluminum alloys. There are 30 material properties with values for both materials. Properties with values for just one material (1, 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 SAE-AISI 5155 steel and the bottom bar is 5082 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
67
Elongation at Break, % 21
1.1
Fatigue Strength, MPa 260
110 to 130
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 73
25
Shear Strength, MPa 390
210 to 230
Tensile Strength: Ultimate (UTS), MPa 620
380 to 400
Tensile Strength: Yield (Proof), MPa 380
300 to 340

Thermal Properties

Latent Heat of Fusion, J/g 250
400
Maximum Temperature: Mechanical, °C 420
180
Melting Completion (Liquidus), °C 1450
640
Melting Onset (Solidus), °C 1410
560
Specific Heat Capacity, J/kg-K 470
910
Thermal Conductivity, W/m-K 49
130
Thermal Expansion, µm/m-K 12
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.2
32
Electrical Conductivity: Equal Weight (Specific), % IACS 8.3
110

Otherwise Unclassified Properties

Base Metal Price, % relative 2.1
9.5
Density, g/cm3 7.8
2.7
Embodied Carbon, kg CO2/kg material 1.4
8.9
Embodied Energy, MJ/kg 19
150
Embodied Water, L/kg 49
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
4.0 to 4.3
Resilience: Unit (Modulus of Resilience), kJ/m3 380
670 to 870
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
51
Strength to Weight: Axial, points 22
39 to 41
Strength to Weight: Bending, points 21
43 to 45
Thermal Diffusivity, mm2/s 13
54
Thermal Shock Resistance, points 20
17 to 18

Alloy Composition


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Aluminum (Al), % 0
93.5 to 96
Carbon (C), % 0.51 to 0.59
0
Chromium (Cr), % 0.7 to 0.9
0 to 0.15
Copper (Cu), % 0
0 to 0.15
Iron (Fe), % 97.2 to 97.9
0 to 0.35
Magnesium (Mg), % 0
4.0 to 5.0
Manganese (Mn), % 0.7 to 0.9
0 to 0.15
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0.15 to 0.35
0 to 0.2
Sulfur (S), % 0 to 0.040
0
Titanium (Ti), % 0
0 to 0.1
Zinc (Zn), % 0
0 to 0.25
Residuals, % 0
0 to 0.15