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4145 Aluminum vs. EN 1.4640 Stainless Steel

4145 aluminum belongs to the aluminum alloys classification, while EN 1.4640 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 EN 1.4640 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
200
Elongation at Break, % 2.2
51
Fatigue Strength, MPa 48
230 to 250
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 28
77
Shear Strength, MPa 69
440 to 460
Tensile Strength: Ultimate (UTS), MPa 120
620 to 650
Tensile Strength: Yield (Proof), MPa 68
240 to 260

Thermal Properties

Latent Heat of Fusion, J/g 540
280
Maximum Temperature: Mechanical, °C 160
930
Melting Completion (Liquidus), °C 590
1420
Melting Onset (Solidus), °C 520
1380
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
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 84
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 10
14
Density, g/cm3 2.8
7.8
Embodied Carbon, kg CO2/kg material 7.6
2.8
Embodied Energy, MJ/kg 140
40
Embodied Water, L/kg 1040
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.3
250 to 260
Resilience: Unit (Modulus of Resilience), kJ/m3 31
150 to 170
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
25
Strength to Weight: Axial, points 12
22 to 23
Strength to Weight: Bending, points 19
21
Thermal Diffusivity, mm2/s 42
4.0
Thermal Shock Resistance, points 5.5
14 to 15

Alloy Composition


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Aluminum (Al), % 83 to 87.4
0
Carbon (C), % 0
0.030 to 0.080
Chromium (Cr), % 0 to 0.15
18 to 19
Copper (Cu), % 3.3 to 4.7
1.3 to 2.0
Iron (Fe), % 0 to 0.8
67.4 to 73.6
Magnesium (Mg), % 0 to 0.15
0
Manganese (Mn), % 0 to 0.15
1.5 to 4.0
Nickel (Ni), % 0
5.5 to 6.9
Nitrogen (N), % 0
0.030 to 0.11
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 9.3 to 10.7
0 to 0.5
Sulfur (S), % 0
0 to 0.015
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.15
0