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S31727 Stainless Steel vs. 3303 Aluminum

S31727 stainless steel belongs to the iron alloys classification, while 3303 aluminum belongs to the aluminum alloys. There are 26 material properties with values for both materials. Properties with values for just one material (9, 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 3303 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
70
Elongation at Break, % 40
23
Fatigue Strength, MPa 240
43
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 78
26
Shear Strength, MPa 430
69
Tensile Strength: Ultimate (UTS), MPa 630
110
Tensile Strength: Yield (Proof), MPa 270
39

Thermal Properties

Latent Heat of Fusion, J/g 290
400
Maximum Temperature: Mechanical, °C 1010
180
Melting Completion (Liquidus), °C 1440
650
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
2.8
Embodied Carbon, kg CO2/kg material 4.7
8.1
Embodied Energy, MJ/kg 64
150
Embodied Water, L/kg 180
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200
20
Resilience: Unit (Modulus of Resilience), kJ/m3 190
11
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
49
Strength to Weight: Axial, points 22
11
Strength to Weight: Bending, points 20
18
Thermal Shock Resistance, points 14
4.8

Alloy Composition

Aluminum (Al), % 0
96.6 to 99
Carbon (C), % 0 to 0.030
0
Chromium (Cr), % 17.5 to 19
0
Copper (Cu), % 2.8 to 4.0
0.050 to 0.2
Iron (Fe), % 53.7 to 61.3
0 to 0.7
Manganese (Mn), % 0 to 1.0
1.0 to 1.5
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 to 0.6
Sulfur (S), % 0 to 0.030
0
Zinc (Zn), % 0
0 to 0.3
Residuals, % 0
0 to 0.15