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4145 Aluminum vs. S44330 Stainless Steel

4145 aluminum belongs to the aluminum alloys classification, while S44330 stainless steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (5, 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 S44330 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
200
Elongation at Break, % 2.2
25
Fatigue Strength, MPa 48
160
Poisson's Ratio 0.33
0.27
Shear Modulus, GPa 28
78
Shear Strength, MPa 69
280
Tensile Strength: Ultimate (UTS), MPa 120
440
Tensile Strength: Yield (Proof), MPa 68
230

Thermal Properties

Latent Heat of Fusion, J/g 540
290
Maximum Temperature: Mechanical, °C 160
990
Melting Completion (Liquidus), °C 590
1440
Melting Onset (Solidus), °C 520
1390
Specific Heat Capacity, J/kg-K 880
480
Thermal Conductivity, W/m-K 100
21
Thermal Expansion, µm/m-K 21
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 26
2.7
Electrical Conductivity: Equal Weight (Specific), % IACS 84
3.1

Otherwise Unclassified Properties

Base Metal Price, % relative 10
13
Density, g/cm3 2.8
7.7
Embodied Carbon, kg CO2/kg material 7.6
2.8
Embodied Energy, MJ/kg 140
40
Embodied Water, L/kg 1040
140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.3
91
Resilience: Unit (Modulus of Resilience), kJ/m3 31
140
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
25
Strength to Weight: Axial, points 12
16
Strength to Weight: Bending, points 19
17
Thermal Diffusivity, mm2/s 42
5.7
Thermal Shock Resistance, points 5.5
16

Alloy Composition


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Aluminum (Al), % 83 to 87.4
0
Carbon (C), % 0
0 to 0.025
Chromium (Cr), % 0 to 0.15
20 to 23
Copper (Cu), % 3.3 to 4.7
0.3 to 0.8
Iron (Fe), % 0 to 0.8
72.5 to 79.7
Magnesium (Mg), % 0 to 0.15
0
Manganese (Mn), % 0 to 0.15
0 to 1.0
Niobium (Nb), % 0
0 to 0.8
Nitrogen (N), % 0
0 to 0.025
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
0 to 0.8
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.15
0