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EN 1.4409 Stainless Steel vs. 2025 Aluminum

EN 1.4409 stainless steel belongs to the iron alloys classification, while 2025 aluminum belongs to the aluminum 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 EN 1.4409 stainless steel and the bottom bar is 2025 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 140
110
Elastic (Young's, Tensile) Modulus, GPa 200
72
Elongation at Break, % 34
15
Fatigue Strength, MPa 180
130
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 78
27
Tensile Strength: Ultimate (UTS), MPa 490
400
Tensile Strength: Yield (Proof), MPa 220
260

Thermal Properties

Latent Heat of Fusion, J/g 300
400
Maximum Temperature: Mechanical, °C 990
190
Melting Completion (Liquidus), °C 1440
640
Melting Onset (Solidus), °C 1390
520
Specific Heat Capacity, J/kg-K 480
870
Thermal Conductivity, W/m-K 15
150
Thermal Expansion, µm/m-K 16
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.1
40
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
120

Otherwise Unclassified Properties

Base Metal Price, % relative 19
10
Density, g/cm3 7.8
3.0
Embodied Carbon, kg CO2/kg material 3.7
7.9
Embodied Energy, MJ/kg 52
150
Embodied Water, L/kg 160
1130

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 140
55
Resilience: Unit (Modulus of Resilience), kJ/m3 120
450
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
46
Strength to Weight: Axial, points 17
37
Strength to Weight: Bending, points 18
40
Thermal Diffusivity, mm2/s 4.1
58
Thermal Shock Resistance, points 11
18

Alloy Composition

Aluminum (Al), % 0
90.9 to 95.2
Carbon (C), % 0 to 0.030
0
Chromium (Cr), % 18 to 20
0 to 0.1
Copper (Cu), % 0
3.9 to 5.0
Iron (Fe), % 61.7 to 71
0 to 1.0
Magnesium (Mg), % 0
0 to 0.050
Manganese (Mn), % 0 to 2.0
0.4 to 1.2
Molybdenum (Mo), % 2.0 to 2.5
0
Nickel (Ni), % 9.0 to 12
0
Nitrogen (N), % 0 to 0.2
0
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0 to 1.5
0.5 to 1.2
Sulfur (S), % 0 to 0.025
0
Titanium (Ti), % 0
0 to 0.15
Zinc (Zn), % 0
0 to 0.25
Residuals, % 0
0 to 0.15