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4115 Aluminum vs. S21600 Stainless Steel

4115 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 4115 aluminum and the bottom bar is S21600 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 38 to 68
200
Elastic (Young's, Tensile) Modulus, GPa 70
200
Elongation at Break, % 1.1 to 11
46
Fatigue Strength, MPa 39 to 76
360
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 26
79
Shear Strength, MPa 71 to 130
500
Tensile Strength: Ultimate (UTS), MPa 120 to 220
710
Tensile Strength: Yield (Proof), MPa 39 to 190
390

Thermal Properties

Latent Heat of Fusion, J/g 420
290
Maximum Temperature: Mechanical, °C 160
990
Melting Completion (Liquidus), °C 640
1420
Melting Onset (Solidus), °C 590
1380
Specific Heat Capacity, J/kg-K 900
480
Thermal Expansion, µm/m-K 23
17

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
17
Density, g/cm3 2.7
7.7
Embodied Carbon, kg CO2/kg material 8.1
3.6
Embodied Energy, MJ/kg 150
50
Embodied Water, L/kg 1160
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.1 to 10
270
Resilience: Unit (Modulus of Resilience), kJ/m3 11 to 270
370
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
25
Strength to Weight: Axial, points 12 to 23
25
Strength to Weight: Bending, points 20 to 30
23
Thermal Shock Resistance, points 5.2 to 9.9
15

Alloy Composition

Aluminum (Al), % 94.6 to 97.4
0
Carbon (C), % 0
0 to 0.080
Chromium (Cr), % 0
17.5 to 22
Copper (Cu), % 0.1 to 0.5
0
Iron (Fe), % 0 to 0.7
57.6 to 67.8
Magnesium (Mg), % 0.1 to 0.5
0
Manganese (Mn), % 0.6 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), % 1.8 to 2.2
0 to 0.75
Sulfur (S), % 0
0 to 0.030
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.15
0