Why are bimetallic wear-resistant plates so wear-resistant?

Bimetallic and composite wear-resistant plates derive their wear resistance from a chromium carbide overlay welded onto the steel substrate; consequently, they are also known as chromium carbide or high-chromium wear-resistant plates. These plates feature high surface hardness, excellent wear resistance, a tough substrate, and ease of processing. They are often categorized by thickness-such as 6+4, 8+6, or 10+8-where the first figure indicates the substrate thickness and the second represents the overlay thickness; a thicker overlay results in superior wear resistance. Compared to NM400, NM500, or even NM600 wear-resistant plates, their service life is more than five times longer, and they last thirty times longer than ordinary steel plates.