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4145 Aluminum vs. AISI 201 Stainless Steel

4145 aluminum belongs to the aluminum alloys classification, while AISI 201 stainless steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (4, 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 AISI 201 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
200
Elongation at Break, % 2.2
4.6 to 51
Fatigue Strength, MPa 48
280 to 600
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 28
77
Shear Strength, MPa 69
450 to 840
Tensile Strength: Ultimate (UTS), MPa 120
650 to 1450
Tensile Strength: Yield (Proof), MPa 68
300 to 1080

Thermal Properties

Latent Heat of Fusion, J/g 540
280
Maximum Temperature: Mechanical, °C 160
880
Melting Completion (Liquidus), °C 590
1410
Melting Onset (Solidus), °C 520
1370
Specific Heat Capacity, J/kg-K 880
480
Thermal Conductivity, W/m-K 100
15
Thermal Expansion, µm/m-K 21
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 26
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 84
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 10
12
Density, g/cm3 2.8
7.7
Embodied Carbon, kg CO2/kg material 7.6
2.6
Embodied Energy, MJ/kg 140
38
Embodied Water, L/kg 1040
140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.3
61 to 340
Resilience: Unit (Modulus of Resilience), kJ/m3 31
230 to 2970
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
25
Strength to Weight: Axial, points 12
23 to 52
Strength to Weight: Bending, points 19
22 to 37
Thermal Diffusivity, mm2/s 42
4.0
Thermal Shock Resistance, points 5.5
14 to 32

Alloy Composition


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Aluminum (Al), % 83 to 87.4
0
Carbon (C), % 0
0 to 0.15
Chromium (Cr), % 0 to 0.15
16 to 18
Copper (Cu), % 3.3 to 4.7
0
Iron (Fe), % 0 to 0.8
67.5 to 75
Magnesium (Mg), % 0 to 0.15
0
Manganese (Mn), % 0 to 0.15
5.5 to 7.5
Nickel (Ni), % 0
3.5 to 5.5
Nitrogen (N), % 0
0 to 0.25
Phosphorus (P), % 0
0 to 0.060
Silicon (Si), % 9.3 to 10.7
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.15
0