Which material is commonly associated with high-temperature applications in power plants?

Forged steel is commonly associated with high-temperature applications in power plants due to its excellent strength and durability at elevated temperatures. It is made by shaping metal through deformation, which enhances its mechanical properties, making it suitable for demanding environments such as those found in boilers, turbines, and piping systems.

In high-temperature applications, materials need to withstand thermal expansion, pressure, and stress while maintaining their structural integrity. Forged steel offers a combination of high tensile strength and resistance to thermal fatigue, making it an ideal choice for components that experience drastic temperature fluctuations and high pressures.

In contrast, the other materials listed have limitations that make them less suitable for such applications. For instance, aluminum, while lightweight and resistant to corrosion, has a lower melting point and may not hold up well under the intense heat found in power generation. Cast iron, although strong, is brittle at high temperatures and can fracture under stress. PVC is a plastic that cannot withstand high temperatures and is generally unsuitable for applications involving heat and pressure, as it can deform or melt. Therefore, forged steel is the material best suited for high-temperature applications in power plants.