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SAE-AISI 9254 Steel vs. 2618 Aluminum

SAE-AISI 9254 steel belongs to the iron alloys classification, while 2618 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 9254 steel and the bottom bar is 2618 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200
120
Elastic (Young's, Tensile) Modulus, GPa 190
71
Elongation at Break, % 20
5.8
Fatigue Strength, MPa 280
110
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 72
27
Shear Strength, MPa 410
260
Tensile Strength: Ultimate (UTS), MPa 660
420
Tensile Strength: Yield (Proof), MPa 410
350

Thermal Properties

Latent Heat of Fusion, J/g 270
390
Maximum Temperature: Mechanical, °C 410
210
Melting Completion (Liquidus), °C 1440
640
Melting Onset (Solidus), °C 1400
550
Specific Heat Capacity, J/kg-K 480
880
Thermal Conductivity, W/m-K 46
160
Thermal Expansion, µm/m-K 13
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.4
37
Electrical Conductivity: Equal Weight (Specific), % IACS 8.6
110

Otherwise Unclassified Properties

Base Metal Price, % relative 2.2
11
Density, g/cm3 7.7
2.9
Embodied Carbon, kg CO2/kg material 1.5
8.3
Embodied Energy, MJ/kg 20
150
Embodied Water, L/kg 49
1150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 110
23
Resilience: Unit (Modulus of Resilience), kJ/m3 450
850
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
47
Strength to Weight: Axial, points 24
40
Strength to Weight: Bending, points 22
42
Thermal Diffusivity, mm2/s 12
62
Thermal Shock Resistance, points 20
19

Alloy Composition

Aluminum (Al), % 0
92.4 to 94.9
Carbon (C), % 0.51 to 0.59
0
Chromium (Cr), % 0.6 to 0.8
0
Copper (Cu), % 0
1.9 to 2.7
Iron (Fe), % 96.1 to 97.1
0.9 to 1.3
Magnesium (Mg), % 0
1.3 to 1.8
Manganese (Mn), % 0.6 to 0.8
0
Nickel (Ni), % 0
0.9 to 1.2
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 1.2 to 1.6
0.1 to 0.25
Sulfur (S), % 0 to 0.040
0
Titanium (Ti), % 0
0.040 to 0.1
Zinc (Zn), % 0
0 to 0.1
Residuals, % 0
0 to 0.15