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SAE-AISI 8655 Steel vs. 5657 Aluminum

SAE-AISI 8655 steel belongs to the iron alloys classification, while 5657 aluminum belongs to the aluminum 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 SAE-AISI 8655 steel and the bottom bar is 5657 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
40 to 50
Elastic (Young's, Tensile) Modulus, GPa 190
68
Elongation at Break, % 23
6.6 to 15
Fatigue Strength, MPa 290
74 to 88
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 73
26
Shear Strength, MPa 390
92 to 110
Tensile Strength: Ultimate (UTS), MPa 620
150 to 200
Tensile Strength: Yield (Proof), MPa 410
140 to 170

Thermal Properties

Latent Heat of Fusion, J/g 250
400
Maximum Temperature: Mechanical, °C 410
180
Melting Completion (Liquidus), °C 1460
660
Melting Onset (Solidus), °C 1410
640
Specific Heat Capacity, J/kg-K 470
900
Thermal Conductivity, W/m-K 39
210
Thermal Expansion, µm/m-K 13
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
54
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
180

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
9.5
Density, g/cm3 7.8
2.7
Embodied Carbon, kg CO2/kg material 1.5
8.4
Embodied Energy, MJ/kg 20
160
Embodied Water, L/kg 50
1200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
9.7 to 27
Resilience: Unit (Modulus of Resilience), kJ/m3 440
140 to 200
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
50
Strength to Weight: Axial, points 22
15 to 20
Strength to Weight: Bending, points 21
23 to 28
Thermal Diffusivity, mm2/s 10
84
Thermal Shock Resistance, points 18
6.7 to 8.6

Alloy Composition

Aluminum (Al), % 0
98.5 to 99.4
Carbon (C), % 0.51 to 0.59
0
Chromium (Cr), % 0.4 to 0.6
0
Copper (Cu), % 0
0 to 0.1
Gallium (Ga), % 0
0 to 0.030
Iron (Fe), % 96.4 to 97.6
0 to 0.1
Magnesium (Mg), % 0
0.6 to 1.0
Manganese (Mn), % 0.75 to 1.0
0 to 0.030
Molybdenum (Mo), % 0.15 to 0.25
0
Nickel (Ni), % 0.4 to 0.7
0
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0.15 to 0.35
0 to 0.080
Sulfur (S), % 0 to 0.040
0
Vanadium (V), % 0
0 to 0.050
Zinc (Zn), % 0
0 to 0.050
Residuals, % 0
0 to 0.050