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S31727 Stainless Steel vs. 515.0 Aluminum

S31727 stainless steel belongs to the iron alloys classification, while 515.0 aluminum belongs to the aluminum alloys. There are 23 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 S31727 stainless steel and the bottom bar is 515.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
70
Elongation at Break, % 40
10
Fatigue Strength, MPa 240
130
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 78
26
Shear Strength, MPa 430
190
Tensile Strength: Ultimate (UTS), MPa 630
280

Thermal Properties

Latent Heat of Fusion, J/g 290
470
Maximum Temperature: Mechanical, °C 1010
170
Melting Completion (Liquidus), °C 1440
620
Melting Onset (Solidus), °C 1390
620
Specific Heat Capacity, J/kg-K 470
900
Thermal Expansion, µm/m-K 16
23

Otherwise Unclassified Properties

Base Metal Price, % relative 24
9.5
Density, g/cm3 8.0
2.6
Embodied Carbon, kg CO2/kg material 4.7
8.4
Embodied Energy, MJ/kg 64
150
Embodied Water, L/kg 180
1120

Common Calculations

Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 24
52
Strength to Weight: Axial, points 22
30
Strength to Weight: Bending, points 20
36
Thermal Shock Resistance, points 14
13

Alloy Composition

Aluminum (Al), % 0
93.6 to 96.6
Carbon (C), % 0 to 0.030
0
Chromium (Cr), % 17.5 to 19
0
Copper (Cu), % 2.8 to 4.0
0 to 0.2
Iron (Fe), % 53.7 to 61.3
0 to 1.3
Magnesium (Mg), % 0
2.5 to 4.0
Manganese (Mn), % 0 to 1.0
0.4 to 0.6
Molybdenum (Mo), % 3.8 to 4.5
0
Nickel (Ni), % 14.5 to 16.5
0
Nitrogen (N), % 0.15 to 0.21
0
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0 to 1.0
0.5 to 10
Sulfur (S), % 0 to 0.030
0
Zinc (Zn), % 0
0 to 0.1
Residuals, % 0
0 to 0.15