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4145 Aluminum vs. S66286 Stainless Steel

4145 aluminum belongs to the aluminum alloys classification, while S66286 stainless steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (3, 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 4145 aluminum and the bottom bar is S66286 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
190
Elongation at Break, % 2.2
17 to 40
Fatigue Strength, MPa 48
240 to 410
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 28
75
Shear Strength, MPa 69
420 to 630
Tensile Strength: Ultimate (UTS), MPa 120
620 to 1020
Tensile Strength: Yield (Proof), MPa 68
280 to 670

Thermal Properties

Latent Heat of Fusion, J/g 540
300
Maximum Temperature: Mechanical, °C 160
920
Melting Completion (Liquidus), °C 590
1430
Melting Onset (Solidus), °C 520
1370
Specific Heat Capacity, J/kg-K 880
470
Thermal Conductivity, W/m-K 100
15
Thermal Expansion, µm/m-K 21
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 26
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 84
2.2

Otherwise Unclassified Properties

Base Metal Price, % relative 10
26
Density, g/cm3 2.8
7.9
Embodied Carbon, kg CO2/kg material 7.6
6.0
Embodied Energy, MJ/kg 140
87
Embodied Water, L/kg 1040
170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.3
150 to 200
Resilience: Unit (Modulus of Resilience), kJ/m3 31
190 to 1150
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
24
Strength to Weight: Axial, points 12
22 to 36
Strength to Weight: Bending, points 19
20 to 28
Thermal Diffusivity, mm2/s 42
4.0
Thermal Shock Resistance, points 5.5
13 to 22

Alloy Composition


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Aluminum (Al), % 83 to 87.4
0 to 0.35
Boron (B), % 0
0.0010 to 0.010
Carbon (C), % 0
0 to 0.080
Chromium (Cr), % 0 to 0.15
13.5 to 16
Copper (Cu), % 3.3 to 4.7
0
Iron (Fe), % 0 to 0.8
49.1 to 59.5
Magnesium (Mg), % 0 to 0.15
0
Manganese (Mn), % 0 to 0.15
0 to 2.0
Molybdenum (Mo), % 0
1.0 to 1.5
Nickel (Ni), % 0
24 to 27
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 9.3 to 10.7
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0
1.9 to 2.4
Vanadium (V), % 0
0.1 to 0.5
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.15
0