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4145 Aluminum vs. EN 1.4740 Stainless Steel

4145 aluminum belongs to the aluminum alloys classification, while EN 1.4740 stainless steel belongs to the iron alloys. There are 21 material properties with values for both materials. Properties with values for just one material (13, 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 EN 1.4740 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
200
Elongation at Break, % 2.2
22
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 28
77

Thermal Properties

Latent Heat of Fusion, J/g 540
300
Maximum Temperature: Mechanical, °C 160
900
Melting Completion (Liquidus), °C 590
1420
Melting Onset (Solidus), °C 520
1370
Specific Heat Capacity, J/kg-K 880
490
Thermal Conductivity, W/m-K 100
18
Thermal Expansion, µm/m-K 21
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 26
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 84
2.6

Otherwise Unclassified Properties

Base Metal Price, % relative 10
9.5
Density, g/cm3 2.8
7.6
Embodied Carbon, kg CO2/kg material 7.6
2.3
Embodied Energy, MJ/kg 140
32
Embodied Water, L/kg 1040
120

Common Calculations

Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
25
Thermal Diffusivity, mm2/s 42
4.8

Alloy Composition


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Aluminum (Al), % 83 to 87.4
0
Carbon (C), % 0
0.3 to 0.5
Chromium (Cr), % 0 to 0.15
16 to 19
Copper (Cu), % 3.3 to 4.7
0
Iron (Fe), % 0 to 0.8
75.4 to 82.7
Magnesium (Mg), % 0 to 0.15
0
Manganese (Mn), % 0 to 0.15
0 to 1.0
Molybdenum (Mo), % 0
0 to 0.5
Nickel (Ni), % 0
0 to 1.0
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 9.3 to 10.7
1.0 to 2.5
Sulfur (S), % 0
0 to 0.030
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.15
0