MakeItFrom.com
Menu (ESC)

SAE-AISI 8655 Steel vs. 2025 Aluminum

SAE-AISI 8655 steel belongs to the iron alloys classification, while 2025 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 2025 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
110
Elastic (Young's, Tensile) Modulus, GPa 190
72
Elongation at Break, % 23
15
Fatigue Strength, MPa 290
130
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 73
27
Shear Strength, MPa 390
240
Tensile Strength: Ultimate (UTS), MPa 620
400
Tensile Strength: Yield (Proof), MPa 410
260

Thermal Properties

Latent Heat of Fusion, J/g 250
400
Maximum Temperature: Mechanical, °C 410
190
Melting Completion (Liquidus), °C 1460
640
Melting Onset (Solidus), °C 1410
520
Specific Heat Capacity, J/kg-K 470
870
Thermal Conductivity, W/m-K 39
150
Thermal Expansion, µm/m-K 13
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
40
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
120

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
10
Density, g/cm3 7.8
3.0
Embodied Carbon, kg CO2/kg material 1.5
7.9
Embodied Energy, MJ/kg 20
150
Embodied Water, L/kg 50
1130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 130
55
Resilience: Unit (Modulus of Resilience), kJ/m3 440
450
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
46
Strength to Weight: Axial, points 22
37
Strength to Weight: Bending, points 21
40
Thermal Diffusivity, mm2/s 10
58
Thermal Shock Resistance, points 18
18

Alloy Composition

Aluminum (Al), % 0
90.9 to 95.2
Carbon (C), % 0.51 to 0.59
0
Chromium (Cr), % 0.4 to 0.6
0 to 0.1
Copper (Cu), % 0
3.9 to 5.0
Iron (Fe), % 96.4 to 97.6
0 to 1.0
Magnesium (Mg), % 0
0 to 0.050
Manganese (Mn), % 0.75 to 1.0
0.4 to 1.2
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
0.5 to 1.2
Sulfur (S), % 0 to 0.040
0
Titanium (Ti), % 0
0 to 0.15
Zinc (Zn), % 0
0 to 0.25
Residuals, % 0
0 to 0.15