Exhaust valves are often made from which material?

Exhaust valves are often made from a separate alloy metal because these alloys are specifically designed to withstand the extreme temperatures and corrosive environment found in the exhaust system of an engine. The materials used for exhaust valves must have high strength to resist bending and breaking under high stress, as well as high-temperature stability to prevent warping or failure during operation. These alloy metals typically consist of iron combined with various elements to improve durability, thermal stability, and resistance to oxidation and wear.

Using a separate alloy ensures that the valves can perform reliably over time in the demanding conditions they face, which makes them suitable for use in small engines and other types of engines. The uniqueness of alloy metals, which can be tailored for these specific performance requirements, is why they are preferred for exhaust valves rather than more common metals or materials.