When youre choosing a tubing material, the choices might seem overwhelming; both stainless steel and aluminum come in a variety of alloys and tempers, each with its own physical and mechanical properties. Each metal has general properties that are true for all its alloys.
One factor to take into consideration is the mechanical properties that are required for your application. In situations where strength is more important, you may choose stainless steel for its good strength-to-weight ratio and ability to gain significant strength from cold working.
Another factor to consider is the corrosion resistance or heat resistance of metal tubing. In general, both stainless steel and aluminum offer corrosion protection, and the amount will vary depending upon the alloy chosen. The passivating oxide films that form on the surfaces of both metals help keep the metals from corroding.
Regardless of whether your tube is intentionally conducting heat, youll want to ensure it can handle the temperature of its operating environment. Stainless steels with high concentrations of chromium and nickel retain strength at high temperatures.
In summary, the main factors to consider when choosing what metal and alloy are best for your application are the mechanical properties, corrosion resistance, and heat resistance. Once youve chosen a category of metal that best fits your application, youre ready to choose the exact alloy and temper you need.
Courtesy of Eagle Stainless Tube & Fabrication, Inc.