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S31727 Stainless Steel vs. 705.0 Aluminum

S31727 stainless steel belongs to the iron alloys classification, while 705.0 aluminum belongs to the aluminum alloys. There are 26 material properties with values for both materials. Properties with values for just one material (10, 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 705.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
62 to 65
Elastic (Young's, Tensile) Modulus, GPa 200
69
Elongation at Break, % 40
8.4 to 10
Fatigue Strength, MPa 240
63 to 98
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 78
26
Tensile Strength: Ultimate (UTS), MPa 630
240 to 260
Tensile Strength: Yield (Proof), MPa 270
130

Thermal Properties

Latent Heat of Fusion, J/g 290
390
Maximum Temperature: Mechanical, °C 1010
180
Melting Completion (Liquidus), °C 1440
640
Melting Onset (Solidus), °C 1390
610
Specific Heat Capacity, J/kg-K 470
890
Thermal Expansion, µm/m-K 16
24

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
8.4
Embodied Energy, MJ/kg 64
150
Embodied Water, L/kg 180
1170

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200
18 to 20
Resilience: Unit (Modulus of Resilience), kJ/m3 190
120 to 130
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
49
Strength to Weight: Axial, points 22
24 to 26
Strength to Weight: Bending, points 20
31 to 32
Thermal Shock Resistance, points 14
11

Alloy Composition

Aluminum (Al), % 0
92.3 to 98.6
Carbon (C), % 0 to 0.030
0
Chromium (Cr), % 17.5 to 19
0 to 0.4
Copper (Cu), % 2.8 to 4.0
0 to 0.2
Iron (Fe), % 53.7 to 61.3
0 to 0.8
Magnesium (Mg), % 0
1.4 to 1.8
Manganese (Mn), % 0 to 1.0
0 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 to 0.2
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
0 to 0.25
Zinc (Zn), % 0
0 to 3.3
Residuals, % 0
0 to 0.15