Which type of metal is used primarily in items that require high strength to maintain an edge?

The use of martensitic stainless steel is prevalent in applications that require high strength and edge retention, particularly in cutting tools and blades. Martensitic steel is characterized by its high carbon content and the ability to harden through heat treatment. This hardening process significantly increases the strength and wear resistance of the steel, enabling it to maintain a sharper edge for a longer period compared to other types of steel.

In contrast, austenitic stainless steel, while having excellent corrosion resistance and formability, does not achieve the same hardness that martensitic steel can obtain when properly treated. Ferritic stainless steels, known for their good corrosion resistance and ductility, typically lack the high strength needed to maintain a sharp edge effectively. Non-ferrous metals, which include a variety of metals that do not contain significant amounts of iron, generally do not exhibit the necessary properties for high-performance cutting applications.

Thus, martensitic stainless steel is the ideal choice for items that need to retain a strong and durable edge due to its unique composition and heat treatment capabilities.