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201.0 Aluminum vs. S21900 Stainless Steel

201.0 aluminum belongs to the aluminum alloys classification, while S21900 stainless steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (7, 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 201.0 aluminum and the bottom bar is S21900 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 95 to 140
220
Elastic (Young's, Tensile) Modulus, GPa 71
200
Elongation at Break, % 4.4 to 20
50
Fatigue Strength, MPa 120 to 150
380
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 27
78
Shear Strength, MPa 290
510
Tensile Strength: Ultimate (UTS), MPa 370 to 470
710
Tensile Strength: Yield (Proof), MPa 220 to 400
390

Thermal Properties

Latent Heat of Fusion, J/g 390
290
Maximum Temperature: Mechanical, °C 170
980
Melting Completion (Liquidus), °C 650
1400
Melting Onset (Solidus), °C 570
1350
Specific Heat Capacity, J/kg-K 870
480
Thermal Conductivity, W/m-K 120
14
Thermal Expansion, µm/m-K 19
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 30 to 33
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 87 to 97
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 38
15
Density, g/cm3 3.1
7.7
Embodied Carbon, kg CO2/kg material 8.7
3.0
Embodied Energy, MJ/kg 160
43

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 19 to 63
300
Resilience: Unit (Modulus of Resilience), kJ/m3 330 to 1160
380
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 45
25
Strength to Weight: Axial, points 33 to 42
26
Strength to Weight: Bending, points 37 to 44
23
Thermal Diffusivity, mm2/s 45
3.8
Thermal Shock Resistance, points 19 to 25
15

Alloy Composition

Aluminum (Al), % 92.1 to 95.1
0
Carbon (C), % 0
0 to 0.080
Chromium (Cr), % 0
19 to 21.5
Copper (Cu), % 4.0 to 5.2
0
Iron (Fe), % 0 to 0.15
59.4 to 67.4
Magnesium (Mg), % 0.15 to 0.55
0
Manganese (Mn), % 0.2 to 0.5
8.0 to 10
Nickel (Ni), % 0
5.5 to 7.5
Nitrogen (N), % 0
0.15 to 0.4
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0 to 0.1
0 to 1.0
Silver (Ag), % 0.4 to 1.0
0
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0.15 to 0.35
0
Residuals, % 0 to 0.1
0