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4145 Aluminum vs. S44735 Stainless Steel

4145 aluminum belongs to the aluminum alloys classification, while S44735 stainless steel belongs to the iron alloys. There are 26 material properties with values for both materials. Properties with values for just one material (9, 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 S44735 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
210
Elongation at Break, % 2.2
21
Fatigue Strength, MPa 48
300
Poisson's Ratio 0.33
0.27
Shear Modulus, GPa 28
82
Shear Strength, MPa 69
390
Tensile Strength: Ultimate (UTS), MPa 120
630
Tensile Strength: Yield (Proof), MPa 68
460

Thermal Properties

Latent Heat of Fusion, J/g 540
310
Maximum Temperature: Mechanical, °C 160
1100
Melting Completion (Liquidus), °C 590
1460
Melting Onset (Solidus), °C 520
1420
Specific Heat Capacity, J/kg-K 880
480
Thermal Expansion, µm/m-K 21
11

Otherwise Unclassified Properties

Base Metal Price, % relative 10
21
Density, g/cm3 2.8
7.7
Embodied Carbon, kg CO2/kg material 7.6
4.4
Embodied Energy, MJ/kg 140
61
Embodied Water, L/kg 1040
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.3
120
Resilience: Unit (Modulus of Resilience), kJ/m3 31
520
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 50
26
Strength to Weight: Axial, points 12
23
Strength to Weight: Bending, points 19
21
Thermal Shock Resistance, points 5.5
20

Alloy Composition


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Aluminum (Al), % 83 to 87.4
0
Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0 to 0.15
28 to 30
Copper (Cu), % 3.3 to 4.7
0
Iron (Fe), % 0 to 0.8
60.7 to 68.4
Magnesium (Mg), % 0 to 0.15
0
Manganese (Mn), % 0 to 0.15
0 to 1.0
Molybdenum (Mo), % 0
3.6 to 4.2
Nickel (Ni), % 0
0 to 1.0
Niobium (Nb), % 0
0.2 to 1.0
Nitrogen (N), % 0
0 to 0.045
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
0.2 to 1.0
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.15
0