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355.0 Aluminum vs. S21900 Stainless Steel

355.0 aluminum belongs to the aluminum alloys classification, while S21900 stainless steel belongs to the iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (4, 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 355.0 aluminum and the bottom bar is S21900 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 72 to 83
220
Elastic (Young's, Tensile) Modulus, GPa 71
200
Elongation at Break, % 1.5 to 2.6
50
Fatigue Strength, MPa 55 to 70
380
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 27
78
Shear Strength, MPa 150 to 240
510
Tensile Strength: Ultimate (UTS), MPa 200 to 260
710
Tensile Strength: Yield (Proof), MPa 150 to 190
390

Thermal Properties

Latent Heat of Fusion, J/g 470
290
Maximum Temperature: Mechanical, °C 180
980
Melting Completion (Liquidus), °C 620
1400
Melting Onset (Solidus), °C 560
1350
Specific Heat Capacity, J/kg-K 890
480
Thermal Conductivity, W/m-K 150 to 170
14
Thermal Expansion, µm/m-K 22
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 38 to 43
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 120 to 140
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 9.5
15
Density, g/cm3 2.7
7.7
Embodied Carbon, kg CO2/kg material 8.0
3.0
Embodied Energy, MJ/kg 150
43
Embodied Water, L/kg 1120
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.7 to 5.9
300
Resilience: Unit (Modulus of Resilience), kJ/m3 150 to 250
380
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 51
25
Strength to Weight: Axial, points 20 to 27
26
Strength to Weight: Bending, points 28 to 33
23
Thermal Diffusivity, mm2/s 60 to 69
3.8
Thermal Shock Resistance, points 9.1 to 12
15

Alloy Composition

Aluminum (Al), % 90.3 to 94.1
0
Carbon (C), % 0
0 to 0.080
Chromium (Cr), % 0 to 0.25
19 to 21.5
Copper (Cu), % 1.0 to 1.5
0
Iron (Fe), % 0 to 0.6
59.4 to 67.4
Magnesium (Mg), % 0.4 to 0.6
0
Manganese (Mn), % 0 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), % 4.5 to 5.5
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Titanium (Ti), % 0 to 0.25
0
Zinc (Zn), % 0 to 0.35
0
Residuals, % 0 to 0.15
0