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2025 Aluminum vs. EN 1.4959 Stainless Steel

2025 aluminum belongs to the aluminum alloys classification, while EN 1.4959 stainless steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (3, 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 2025 aluminum and the bottom bar is EN 1.4959 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 72
200
Elongation at Break, % 15
40
Fatigue Strength, MPa 130
170
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 27
77
Shear Strength, MPa 240
430
Tensile Strength: Ultimate (UTS), MPa 400
630
Tensile Strength: Yield (Proof), MPa 260
190

Thermal Properties

Latent Heat of Fusion, J/g 400
300
Maximum Temperature: Mechanical, °C 190
1090
Melting Completion (Liquidus), °C 640
1400
Melting Onset (Solidus), °C 520
1350
Specific Heat Capacity, J/kg-K 870
480
Thermal Conductivity, W/m-K 150
12
Thermal Expansion, µm/m-K 23
15

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40
1.7
Electrical Conductivity: Equal Weight (Specific), % IACS 120
2.0

Otherwise Unclassified Properties

Base Metal Price, % relative 10
31
Density, g/cm3 3.0
8.0
Embodied Carbon, kg CO2/kg material 7.9
5.4
Embodied Energy, MJ/kg 150
76
Embodied Water, L/kg 1130
200

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 55
190
Resilience: Unit (Modulus of Resilience), kJ/m3 450
96
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 46
24
Strength to Weight: Axial, points 37
22
Strength to Weight: Bending, points 40
20
Thermal Diffusivity, mm2/s 58
3.2
Thermal Shock Resistance, points 18
15

Alloy Composition

Aluminum (Al), % 90.9 to 95.2
0.25 to 0.65
Carbon (C), % 0
0.050 to 0.1
Chromium (Cr), % 0 to 0.1
19 to 22
Cobalt (Co), % 0
0 to 0.5
Copper (Cu), % 3.9 to 5.0
0 to 0.5
Iron (Fe), % 0 to 1.0
39.4 to 50.5
Magnesium (Mg), % 0 to 0.050
0
Manganese (Mn), % 0.4 to 1.2
0 to 1.5
Nickel (Ni), % 0
30 to 34
Nitrogen (N), % 0
0 to 0.030
Phosphorus (P), % 0
0 to 0.015
Silicon (Si), % 0.5 to 1.2
0 to 0.7
Sulfur (S), % 0
0 to 0.010
Titanium (Ti), % 0 to 0.15
0.25 to 0.65
Zinc (Zn), % 0 to 0.25
0
Residuals, % 0 to 0.15
0