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2025 Aluminum vs. S41425 Stainless Steel

2025 aluminum belongs to the aluminum alloys classification, while S41425 stainless steel belongs to the iron alloys. There are 31 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 S41425 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 110
280
Elastic (Young's, Tensile) Modulus, GPa 72
200
Elongation at Break, % 15
17
Fatigue Strength, MPa 130
450
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 27
77
Shear Strength, MPa 240
570
Tensile Strength: Ultimate (UTS), MPa 400
920
Tensile Strength: Yield (Proof), MPa 260
750

Thermal Properties

Latent Heat of Fusion, J/g 400
280
Maximum Temperature: Mechanical, °C 190
810
Melting Completion (Liquidus), °C 640
1450
Melting Onset (Solidus), °C 520
1410
Specific Heat Capacity, J/kg-K 870
470
Thermal Conductivity, W/m-K 150
16
Thermal Expansion, µm/m-K 23
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40
2.3
Electrical Conductivity: Equal Weight (Specific), % IACS 120
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 10
13
Density, g/cm3 3.0
7.9
Embodied Carbon, kg CO2/kg material 7.9
2.9
Embodied Energy, MJ/kg 150
40
Embodied Water, L/kg 1130
120

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 55
150
Resilience: Unit (Modulus of Resilience), kJ/m3 450
1420
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 46
25
Strength to Weight: Axial, points 37
33
Strength to Weight: Bending, points 40
27
Thermal Diffusivity, mm2/s 58
4.4
Thermal Shock Resistance, points 18
33

Alloy Composition

Aluminum (Al), % 90.9 to 95.2
0
Carbon (C), % 0
0 to 0.050
Chromium (Cr), % 0 to 0.1
12 to 15
Copper (Cu), % 3.9 to 5.0
0 to 0.3
Iron (Fe), % 0 to 1.0
74 to 81.9
Magnesium (Mg), % 0 to 0.050
0
Manganese (Mn), % 0.4 to 1.2
0.5 to 1.0
Molybdenum (Mo), % 0
1.5 to 2.0
Nickel (Ni), % 0
4.0 to 7.0
Nitrogen (N), % 0
0.060 to 0.12
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0.5 to 1.2
0 to 0.5
Sulfur (S), % 0
0 to 0.0050
Titanium (Ti), % 0 to 0.15
0
Zinc (Zn), % 0 to 0.25
0
Residuals, % 0 to 0.15
0