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4145 Aluminum vs. EN 1.4518 Stainless Steel

4145 aluminum belongs to the aluminum alloys classification, while EN 1.4518 stainless steel belongs to the iron alloys. There are 29 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 EN 1.4518 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
200
Elongation at Break, % 2.2
34
Fatigue Strength, MPa 48
160
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 28
79
Tensile Strength: Ultimate (UTS), MPa 120
490
Tensile Strength: Yield (Proof), MPa 68
210

Thermal Properties

Latent Heat of Fusion, J/g 540
300
Maximum Temperature: Mechanical, °C 160
1000
Melting Completion (Liquidus), °C 590
1450
Melting Onset (Solidus), °C 520
1400
Specific Heat Capacity, J/kg-K 880
470
Thermal Conductivity, W/m-K 100
15
Thermal Expansion, µm/m-K 21
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 26
2.1
Electrical Conductivity: Equal Weight (Specific), % IACS 84
2.4

Otherwise Unclassified Properties

Base Metal Price, % relative 10
20
Density, g/cm3 2.8
7.9
Embodied Carbon, kg CO2/kg material 7.6
4.0
Embodied Energy, MJ/kg 140
55
Embodied Water, L/kg 1040
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.3
140
Resilience: Unit (Modulus of Resilience), kJ/m3 31
100
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
25
Strength to Weight: Axial, points 12
17
Strength to Weight: Bending, points 19
18
Thermal Diffusivity, mm2/s 42
4.1
Thermal Shock Resistance, points 5.5
14

Alloy Composition

Aluminum (Al), % 83 to 87.4
0
Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0 to 0.15
18 to 20
Copper (Cu), % 3.3 to 4.7
0
Iron (Fe), % 0 to 0.8
61.4 to 70
Magnesium (Mg), % 0 to 0.15
0
Manganese (Mn), % 0 to 0.15
0 to 1.5
Molybdenum (Mo), % 0
3.0 to 3.5
Nickel (Ni), % 0
9.0 to 12
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 9.3 to 10.7
0 to 1.5
Sulfur (S), % 0
0 to 0.030
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.15
0