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2025 Aluminum vs. S21600 Stainless Steel

2025 aluminum belongs to the aluminum alloys classification, while S21600 stainless steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (8, 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 S21600 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 110
200
Elastic (Young's, Tensile) Modulus, GPa 72
200
Elongation at Break, % 15
46
Fatigue Strength, MPa 130
360
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 27
79
Shear Strength, MPa 240
500
Tensile Strength: Ultimate (UTS), MPa 400
710
Tensile Strength: Yield (Proof), MPa 260
390

Thermal Properties

Latent Heat of Fusion, J/g 400
290
Maximum Temperature: Mechanical, °C 190
990
Melting Completion (Liquidus), °C 640
1420
Melting Onset (Solidus), °C 520
1380
Specific Heat Capacity, J/kg-K 870
480
Thermal Expansion, µm/m-K 23
17

Otherwise Unclassified Properties

Base Metal Price, % relative 10
17
Density, g/cm3 3.0
7.7
Embodied Carbon, kg CO2/kg material 7.9
3.6
Embodied Energy, MJ/kg 150
50
Embodied Water, L/kg 1130
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 55
270
Resilience: Unit (Modulus of Resilience), kJ/m3 450
370
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 46
25
Strength to Weight: Axial, points 37
25
Strength to Weight: Bending, points 40
23
Thermal Shock Resistance, points 18
15

Alloy Composition

Aluminum (Al), % 90.9 to 95.2
0
Carbon (C), % 0
0 to 0.080
Chromium (Cr), % 0 to 0.1
17.5 to 22
Copper (Cu), % 3.9 to 5.0
0
Iron (Fe), % 0 to 1.0
57.6 to 67.8
Magnesium (Mg), % 0 to 0.050
0
Manganese (Mn), % 0.4 to 1.2
7.5 to 9.0
Molybdenum (Mo), % 0
2.0 to 3.0
Nickel (Ni), % 0
5.0 to 7.0
Nitrogen (N), % 0
0.25 to 0.5
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0.5 to 1.2
0 to 0.75
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.15
0
Zinc (Zn), % 0 to 0.25
0
Residuals, % 0 to 0.15
0