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S31727 Stainless Steel vs. 6101B Aluminum

S31727 stainless steel belongs to the iron alloys classification, while 6101B 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 6101B aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
68
Elongation at Break, % 40
9.1 to 13
Fatigue Strength, MPa 240
62 to 70
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 78
26
Shear Strength, MPa 430
120 to 150
Tensile Strength: Ultimate (UTS), MPa 630
190 to 250
Tensile Strength: Yield (Proof), MPa 270
140 to 180

Thermal Properties

Latent Heat of Fusion, J/g 290
400
Maximum Temperature: Mechanical, °C 1010
160
Melting Completion (Liquidus), °C 1440
640
Melting Onset (Solidus), °C 1390
630
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
2.7
Embodied Carbon, kg CO2/kg material 4.7
8.3
Embodied Energy, MJ/kg 64
150
Embodied Water, L/kg 180
1190

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200
20 to 23
Resilience: Unit (Modulus of Resilience), kJ/m3 190
140 to 240
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
50
Strength to Weight: Axial, points 22
20 to 25
Strength to Weight: Bending, points 20
27 to 32
Thermal Shock Resistance, points 14
8.5 to 11

Alloy Composition

Aluminum (Al), % 0
98.2 to 99.3
Carbon (C), % 0 to 0.030
0
Chromium (Cr), % 17.5 to 19
0
Copper (Cu), % 2.8 to 4.0
0 to 0.050
Iron (Fe), % 53.7 to 61.3
0.1 to 0.3
Magnesium (Mg), % 0
0.35 to 0.6
Manganese (Mn), % 0 to 1.0
0 to 0.050
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
0.3 to 0.6
Sulfur (S), % 0 to 0.030
0
Zinc (Zn), % 0
0 to 0.1
Residuals, % 0
0 to 0.1