W18Cr4V is considered a ledeburite steel due to its specific composition and microstructure. Ledeburitic refers to a specific type of steel microstructure that contains a high percentage of carbides within a ferrite matrix.
W18Cr4V contains tungsten (W), chromium (Cr), and vanadium (V) as the primary alloying elements. These elements contribute to the formation of hard carbides, which are dispersed throughout the steel matrix. The high carbide content results in extremely hard and wear-resistant steel, making it suitable for applications requiring high strength and good cutting performance.
The ledeburitic microstructure is formed during the heat treatment process. The carbides are able to separate from the steel matrix by quickly cooling the steel after it has been heated to a high temperature. The resulting microstructure consists of hard carbides embedded in a softer ferrite matrix, providing a desirable combination of hardness and toughness.
Overall, W18Cr4V is categorized as ledeburitic steel due to its composition and the specific microstructure it forms, which gives it excellent cutting performance and wear resistance properties.