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Strength to weight ratio: Aluminum is not as strong as steel, but it weighs about one-third of steel. This is the main reason for using aluminum on airplanes.
Corrosion: Stainless steel is composed of iron, chromium, nickel, manganese, and copper. Chromium is used as a reagent to provide corrosion resistance. In addition, due to its non porous nature, its corrosion resistance is enhanced. Aluminum has strong oxidation and corrosion resistance due to its passivation layer. When aluminum is oxidized, the surface turns white and sometimes pits may appear. Aluminum can undergo extensive corrosion under certain extreme acidic or alkaline conditions, resulting in catastrophic consequences.
Thermal conductivity: Aluminum has greater thermal conductivity (thermal conductivity) than stainless steel. This is one of the main reasons why aluminum is used in car radiators and air conditioning systems.
Cost: Aluminum is usually much cheaper than stainless steel.
Workability: Due to the relatively soft nature of aluminum, it is easier to cut and shape. Stainless steel is difficult to process because it is resistant to wear and tear. Stainless steel is stronger than aluminum and difficult to shape due to its hardness.
Welding: Welding aluminum is a bit difficult, but welding stainless steel is much easier.
Thermal performance: Stainless steel can be used at higher temperatures, but aluminum cannot be used at extremely high temperatures because it becomes very soft above 400 degrees.
Conductivity: When we talk about conductivity, stainless steel is a very poor conductor compared to most metals. Aluminum is an excellent electrical conductor. Aluminum is widely used in overhead power lines due to its high conductivity, light weight, and corrosion resistance.
Strength: In terms of strength, stainless steel is superior to aluminum (assuming weight is not a factor).
The impact on food: Aluminum may react with food, changing its color and taste. Stainless steel has a smaller reaction with food.
