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4145 Aluminum vs. AISI 301L Stainless Steel

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

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
200
Elongation at Break, % 2.2
22 to 50
Fatigue Strength, MPa 48
240 to 530
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 28
77
Shear Strength, MPa 69
440 to 660
Tensile Strength: Ultimate (UTS), MPa 120
620 to 1040
Tensile Strength: Yield (Proof), MPa 68
250 to 790

Thermal Properties

Latent Heat of Fusion, J/g 540
280
Maximum Temperature: Mechanical, °C 160
890
Melting Completion (Liquidus), °C 590
1430
Melting Onset (Solidus), °C 520
1390
Specific Heat Capacity, J/kg-K 880
480
Thermal Conductivity, W/m-K 100
15
Thermal Expansion, µm/m-K 21
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 26
2.3
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
210 to 300
Resilience: Unit (Modulus of Resilience), kJ/m3 31
160 to 1580
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
25
Strength to Weight: Axial, points 12
22 to 37
Strength to Weight: Bending, points 19
21 to 29
Thermal Diffusivity, mm2/s 42
4.1
Thermal Shock Resistance, points 5.5
14 to 24

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
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 0.2
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