What material is commonly used for boiler tubes?

The choice of carbon steel or stainless steel for boiler tubes is based on their thermal properties, strength, and ability to withstand high pressure and temperature conditions.

Carbon steel is widely used because it offers a good balance of strength, ductility, and cost-effectiveness. It is capable of withstanding the high temperatures and pressures within a boiler system while maintaining structural integrity. The addition of certain alloying elements in carbon steel can enhance its resistance to corrosion and oxidation, which is particularly important in boiler applications where water and steam are present.

Stainless steel is often chosen for its superior corrosion resistance, especially in environments where corrosive agents like oxygen and water are present. Its ability to maintain its strength at elevated temperatures also makes it a suitable option for certain boiler designs.

In contrast, galvanized steel is treated for corrosion resistance through a coating of zinc, but the coating can degrade in high-temperature environments typical in boiler operations, making it less suitable. Aluminum, while lightweight and having good thermal conductivity, does not have the strength and high-temperature performance necessary for boiler tubes, making it unsuitable for this application. Plastic materials lack the necessary strength and thermal characteristics, making them impractical for high-pressure and high-temperature environments like those found in boilers.