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S21904 Stainless Steel vs. 6025 Aluminum

S21904 stainless steel belongs to the iron alloys classification, while 6025 aluminum belongs to the aluminum 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 S21904 stainless steel and the bottom bar is 6025 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
70
Elongation at Break, % 17 to 51
2.8 to 10
Fatigue Strength, MPa 380 to 550
67 to 110
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 78
26
Shear Strength, MPa 510 to 620
110 to 140
Tensile Strength: Ultimate (UTS), MPa 700 to 1000
190 to 240
Tensile Strength: Yield (Proof), MPa 390 to 910
68 to 210

Thermal Properties

Latent Heat of Fusion, J/g 290
410
Maximum Temperature: Mechanical, °C 980
160
Melting Completion (Liquidus), °C 1400
650
Melting Onset (Solidus), °C 1350
550
Specific Heat Capacity, J/kg-K 480
900
Thermal Conductivity, W/m-K 14
130
Thermal Expansion, µm/m-K 17
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.5
33
Electrical Conductivity: Equal Weight (Specific), % IACS 2.9
110

Otherwise Unclassified Properties

Base Metal Price, % relative 15
9.5
Density, g/cm3 7.7
2.8
Embodied Carbon, kg CO2/kg material 3.0
8.5
Embodied Energy, MJ/kg 43
150
Embodied Water, L/kg 160
1160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 160 to 310
6.0 to 15
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 2070
33 to 310
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
50
Strength to Weight: Axial, points 25 to 36
19 to 24
Strength to Weight: Bending, points 23 to 29
26 to 31
Thermal Diffusivity, mm2/s 3.8
54
Thermal Shock Resistance, points 15 to 21
8.2 to 10

Alloy Composition

Aluminum (Al), % 0
91.7 to 96.3
Carbon (C), % 0 to 0.040
0
Chromium (Cr), % 19 to 21.5
0 to 0.2
Copper (Cu), % 0
0.2 to 0.7
Iron (Fe), % 59.5 to 67.4
0 to 0.7
Magnesium (Mg), % 0
2.1 to 3.0
Manganese (Mn), % 8.0 to 10
0.6 to 1.4
Nickel (Ni), % 5.5 to 7.5
0
Nitrogen (N), % 0.15 to 0.4
0
Phosphorus (P), % 0 to 0.045
0
Silicon (Si), % 0 to 1.0
0.8 to 1.5
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
0 to 0.2
Zinc (Zn), % 0
0 to 0.5
Residuals, % 0
0 to 0.15

Comparable Variants