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4145 Aluminum vs. AISI 301 Stainless Steel

4145 aluminum belongs to the aluminum alloys classification, while AISI 301 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 AISI 301 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
200
Elongation at Break, % 2.2
7.4 to 46
Fatigue Strength, MPa 48
210 to 600
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 28
77
Shear Strength, MPa 69
410 to 860
Tensile Strength: Ultimate (UTS), MPa 120
590 to 1460
Tensile Strength: Yield (Proof), MPa 68
230 to 1080

Thermal Properties

Latent Heat of Fusion, J/g 540
280
Maximum Temperature: Mechanical, °C 160
840
Melting Completion (Liquidus), °C 590
1420
Melting Onset (Solidus), °C 520
1400
Specific Heat Capacity, J/kg-K 880
480
Thermal Conductivity, W/m-K 100
16
Thermal Expansion, µm/m-K 21
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 26
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 84
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 10
13
Density, g/cm3 2.8
7.8
Embodied Carbon, kg CO2/kg material 7.6
2.7
Embodied Energy, MJ/kg 140
39
Embodied Water, L/kg 1040
130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.3
99 to 300
Resilience: Unit (Modulus of Resilience), kJ/m3 31
130 to 2970
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
25
Strength to Weight: Axial, points 12
21 to 52
Strength to Weight: Bending, points 19
20 to 37
Thermal Diffusivity, mm2/s 42
4.2
Thermal Shock Resistance, points 5.5
12 to 31

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
70.7 to 78
Magnesium (Mg), % 0 to 0.15
0
Manganese (Mn), % 0 to 0.15
0 to 2.0
Nickel (Ni), % 0
6.0 to 8.0
Nitrogen (N), % 0
0 to 0.1
Phosphorus (P), % 0
0 to 0.045
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