Why choose Aluminium over steel
strength
In comparing the overall strength of steel vs aluminum, there is not a clear and simple answer. This is because, while steel is technically stronger than aluminum, aluminum is often much lighter, so you have to take into consideration the weight to strength ratio. However, in focusing just on shear strength, steel has a high amount of carbon contributing to its general strength advantage.
Corrosion Resistance
When it comes to corrosion resistance, aluminum is the clear winner. Aluminum is incredibly resistant to corrosion, without requiring the need of additional treatments after it has been extruded. Further, aluminum does not rust, and does not require any coatings or paint that will wear or scratch off. Aluminum is protected by its own naturally occurring oxide film. On the other hand, steel is susceptible to resistance. Carbon steel does require a coating of paint or other finish treatment to protect against rust or corrosion. This is especially true if the steel will be located in an environment that is wet or moist, or particularly abrasive. Aluminum can be further enhanced with a variety of finishes such as anodizing, powder coating, brushed finish, media blasting, painting, polishing or chemical wash techniques.
cost
When comparing the two alloys, the cost of steel vs aluminum is one of the most important factors in determining which materials to use for a job. When it comes to the cost of steel vs aluminum, steel is usually less expensive. In saying this though, we must distinguish which type of steel we’re talking about. Mild steels and carbon steels tend to be less expensive than aluminum, but, the cost of stainless steel vs aluminum typically aluminum is much pricer. While you may be tempted to go with the cheaper material for your project, it’s important to weigh all factors. When designing a custom shape or profile, creating a custom aluminum extrusion is surprising inexpensive because of the affordable tooling costs.