Which materials are commonly used in boiler construction?

Boiler construction primarily relies on materials that can withstand high temperatures and pressure while also offering durability and corrosion resistance. Steel is one of the most commonly used materials in boiler construction due to its strength and ability to endure the harsh conditions inside a boiler. Cast iron is also favored for certain types of boilers because it not only supports high pressure but provides excellent heat retention, which enhances the efficiency of steam generation. Aluminum is less common for high-pressure boiler applications but can be found in some lower pressure or specific heat exchanger components due to its lightweight and good thermal conductivity properties.

The other options present materials that are not suitable for boiler construction. Rubber, wood, polyester, and certain plastics do not possess the necessary strength or heat resistance required for the extreme environments of a boiler. Bronze, while a durable metal, is typically not used in boiler fabrication compared to steel or cast iron, which have established roles within the industry.