What are common materials used for boiler construction?

Steel and cast iron are commonly used materials for boiler construction due to their strength, durability, and ability to withstand high pressures and temperatures.

Steel is favored primarily for its high tensile strength and ability to be welded, making it ideal for constructing pressure vessels that need to handle the stresses of a boiler's operation. It also has good heat conductivity, which is essential for transferring heat efficiently within the boiler system.

Cast iron, on the other hand, is known for its excellent resistance to corrosion and wear, making it suitable for certain applications where high-temperature stability is needed. It can also retain heat, making it effective in certain types of boilers, particularly older models.

The other materials mentioned are not typically used in boiler construction. Aluminum and plastic are not appropriate for high-pressure and high-temperature environments typical in boiler systems. Wood and bamboo are not viable choices either, as they cannot handle the physical demands and safety standards required in boiler applications. Copper and bronze, while used in some specific heater applications or fittings, do not serve as the primary structural materials for constructing boilers due to cost and differing mechanical properties compared to steel and cast iron.