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S31727 Stainless Steel vs. 4007 Aluminum

S31727 stainless steel belongs to the iron alloys classification, while 4007 aluminum belongs to the aluminum alloys. There are 27 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 4007 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 190
32 to 44
Elastic (Young's, Tensile) Modulus, GPa 200
71
Elongation at Break, % 40
5.1 to 23
Fatigue Strength, MPa 240
46 to 88
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 78
27
Shear Strength, MPa 430
80 to 90
Tensile Strength: Ultimate (UTS), MPa 630
130 to 160
Tensile Strength: Yield (Proof), MPa 270
50 to 120

Thermal Properties

Latent Heat of Fusion, J/g 290
410
Maximum Temperature: Mechanical, °C 1010
170
Melting Completion (Liquidus), °C 1440
650
Melting Onset (Solidus), °C 1390
590
Specific Heat Capacity, J/kg-K 470
890
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
1160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200
7.4 to 23
Resilience: Unit (Modulus of Resilience), kJ/m3 190
18 to 110
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 24
49
Strength to Weight: Axial, points 22
12 to 15
Strength to Weight: Bending, points 20
20 to 23
Thermal Shock Resistance, points 14
5.5 to 6.7

Alloy Composition

Aluminum (Al), % 0
94.1 to 97.6
Carbon (C), % 0 to 0.030
0
Chromium (Cr), % 17.5 to 19
0.050 to 0.25
Cobalt (Co), % 0
0 to 0.050
Copper (Cu), % 2.8 to 4.0
0 to 0.2
Iron (Fe), % 53.7 to 61.3
0.4 to 1.0
Magnesium (Mg), % 0
0 to 0.2
Manganese (Mn), % 0 to 1.0
0.8 to 1.5
Molybdenum (Mo), % 3.8 to 4.5
0
Nickel (Ni), % 14.5 to 16.5
0.15 to 0.7
Nitrogen (N), % 0.15 to 0.21
0
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0 to 1.0
1.0 to 1.7
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
0 to 0.1
Zinc (Zn), % 0
0 to 0.1
Residuals, % 0
0 to 0.15