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S31727 Stainless Steel vs. 851.0 Aluminum

S31727 stainless steel belongs to the iron alloys classification, while 851.0 aluminum belongs to the aluminum alloys. There are 21 material properties with values for both materials. Properties with values for just one material (15, 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 851.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
69
Elongation at Break, % 40
3.9 to 9.1
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 78
26
Tensile Strength: Ultimate (UTS), MPa 630
130 to 140

Thermal Properties

Latent Heat of Fusion, J/g 290
410
Maximum Temperature: Mechanical, °C 1010
180
Melting Completion (Liquidus), °C 1440
630
Melting Onset (Solidus), °C 1390
360
Specific Heat Capacity, J/kg-K 470
850
Thermal Expansion, µm/m-K 16
23

Otherwise Unclassified Properties

Base Metal Price, % relative 24
14
Density, g/cm3 8.0
3.1
Embodied Carbon, kg CO2/kg material 4.7
8.4
Embodied Energy, MJ/kg 64
160
Embodied Water, L/kg 180
1140

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 24
45
Strength to Weight: Axial, points 22
12 to 13
Strength to Weight: Bending, points 20
19 to 20
Thermal Shock Resistance, points 14
6.1 to 6.3

Alloy Composition

Aluminum (Al), % 0
86.6 to 91.5
Carbon (C), % 0 to 0.030
0
Chromium (Cr), % 17.5 to 19
0
Copper (Cu), % 2.8 to 4.0
0.7 to 1.3
Iron (Fe), % 53.7 to 61.3
0 to 0.7
Magnesium (Mg), % 0
0 to 0.1
Manganese (Mn), % 0 to 1.0
0 to 0.1
Molybdenum (Mo), % 3.8 to 4.5
0
Nickel (Ni), % 14.5 to 16.5
0.3 to 0.7
Nitrogen (N), % 0.15 to 0.21
0
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0 to 1.0
2.0 to 3.0
Sulfur (S), % 0 to 0.030
0
Tin (Sn), % 0
5.5 to 7.0
Titanium (Ti), % 0
0 to 0.2
Residuals, % 0
0 to 0.3