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4145 Aluminum vs. EN 1.4821 Stainless Steel

4145 aluminum belongs to the aluminum alloys classification, while EN 1.4821 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 1.4821 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
200
Elongation at Break, % 2.2
18
Fatigue Strength, MPa 48
280
Poisson's Ratio 0.33
0.27
Shear Modulus, GPa 28
79
Shear Strength, MPa 69
450
Tensile Strength: Ultimate (UTS), MPa 120
730
Tensile Strength: Yield (Proof), MPa 68
450

Thermal Properties

Latent Heat of Fusion, J/g 540
310
Maximum Temperature: Mechanical, °C 160
1100
Melting Completion (Liquidus), °C 590
1410
Melting Onset (Solidus), °C 520
1370
Specific Heat Capacity, J/kg-K 880
490
Thermal Conductivity, W/m-K 100
17
Thermal Expansion, µm/m-K 21
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 26
1.9
Electrical Conductivity: Equal Weight (Specific), % IACS 84
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 10
15
Density, g/cm3 2.8
7.6
Embodied Carbon, kg CO2/kg material 7.6
2.9
Embodied Energy, MJ/kg 140
41
Embodied Water, L/kg 1040
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.3
110
Resilience: Unit (Modulus of Resilience), kJ/m3 31
500
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 50
26
Strength to Weight: Axial, points 12
26
Strength to Weight: Bending, points 19
23
Thermal Diffusivity, mm2/s 42
4.6
Thermal Shock Resistance, points 5.5
21

Alloy Composition


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Aluminum (Al), % 83 to 87.4
0
Carbon (C), % 0
0.1 to 0.2
Chromium (Cr), % 0 to 0.15
24.5 to 26.5
Copper (Cu), % 3.3 to 4.7
0
Iron (Fe), % 0 to 0.8
64.2 to 71.1
Magnesium (Mg), % 0 to 0.15
0
Manganese (Mn), % 0 to 0.15
0 to 2.0
Nickel (Ni), % 0
3.5 to 5.5
Nitrogen (N), % 0
0 to 0.1
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 9.3 to 10.7
0.8 to 1.5
Sulfur (S), % 0
0 to 0.015
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.15
0