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S20910 Stainless Steel vs. 7021 Aluminum

S20910 stainless steel belongs to the iron alloys classification, while 7021 aluminum belongs to the aluminum alloys. There are 28 material properties with values for both materials. Properties with values for just one material (6, 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 S20910 stainless steel and the bottom bar is 7021 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
69
Elongation at Break, % 14 to 39
9.4
Fatigue Strength, MPa 310 to 460
150
Poisson's Ratio 0.28
0.32
Shear Modulus, GPa 79
26
Shear Strength, MPa 500 to 570
270
Tensile Strength: Ultimate (UTS), MPa 780 to 940
460
Tensile Strength: Yield (Proof), MPa 430 to 810
390

Thermal Properties

Latent Heat of Fusion, J/g 300
380
Maximum Temperature: Mechanical, °C 1080
200
Melting Completion (Liquidus), °C 1420
630
Melting Onset (Solidus), °C 1380
510
Specific Heat Capacity, J/kg-K 480
870
Thermal Conductivity, W/m-K 13
150
Thermal Expansion, µm/m-K 16
24

Otherwise Unclassified Properties

Base Metal Price, % relative 22
9.5
Density, g/cm3 7.8
2.9
Embodied Carbon, kg CO2/kg material 4.8
8.3
Embodied Energy, MJ/kg 68
150
Embodied Water, L/kg 180
1140

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120 to 260
41
Resilience: Unit (Modulus of Resilience), kJ/m3 460 to 1640
1110
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 25
47
Strength to Weight: Axial, points 28 to 33
44
Strength to Weight: Bending, points 24 to 27
45
Thermal Diffusivity, mm2/s 3.6
59
Thermal Shock Resistance, points 17 to 21
20

Alloy Composition

Aluminum (Al), % 0
90.7 to 93.7
Carbon (C), % 0 to 0.060
0
Chromium (Cr), % 20.5 to 23.5
0 to 0.050
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 52.1 to 62.1
0 to 0.4
Magnesium (Mg), % 0
1.2 to 1.8
Manganese (Mn), % 4.0 to 6.0
0 to 0.1
Molybdenum (Mo), % 1.5 to 3.0
0
Nickel (Ni), % 11.5 to 13.5
0
Niobium (Nb), % 0.1 to 0.3
0
Nitrogen (N), % 0.2 to 0.4
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 0.75
0 to 0.25
Sulfur (S), % 0 to 0.030
0
Titanium (Ti), % 0
0 to 0.1
Vanadium (V), % 0.1 to 0.3
0
Zinc (Zn), % 0
5.0 to 6.0
Zirconium (Zr), % 0
0.080 to 0.18
Residuals, % 0
0 to 0.15