What material are exhaust valves typically made of to resist corrosion?

Exhaust valves are typically made of silicon-chromium steel or other steel alloys due to their excellent resistance to high temperatures and corrosion, which is crucial in harsh engine environments. High-performance engines generate significant heat, and the materials used for exhaust valves must withstand not only elevated temperatures but also the corrosive effects of exhaust gases. Silicon-chromium steel is specifically designed to retain strength and durability at high temperatures while providing corrosion resistance, making it an ideal choice for exhaust valves.

The high alloy content in steel alloys also allows for better performance characteristics, such as improved fatigue strength and thermal stability, which are essential for the reliability of engine components. This is why this option is the optimal choice for materials used in the manufacturing of exhaust valves.