• Thicker coatings can indeed improve lifespan and abrasion resistance. • However, excessively thick coatings may lead to decreased coating hardness or internal stress cracking. Therefore, thicker coatings are not always better; the optimal coating thickness is closely related to the application conditions.

Carbide-coated rollers are among the most common and significantly outperform chrome-plated rollers in high-end industrial applications. Carbide is typically composed of materials such as tungsten carbide (WC), titanium carbide (TiC), and chromium carbide (CrC), and the coating is formed through thermal spraying, HVOF, or plasma spraying processes.

Cemented carbide coated rollers are significantly harder than steel, typically several to ten times harder. Advantages of carbide-coated rollers: • HV can reach 900–1500, several times higher than steel • Excellent wear resistance • Good corrosion resistance • High surface stability • Long service life

Main Pros of carbide-coated rollers: • High hardness and high wear resistance • Strong corrosion resistance • Good thermal stability • Long service life • High performance-to-cost ratio • Wide range of applications Main Cons of carbide-coated rollers: • Higher cost than ordinary rollers • Coating may peel off • Higher processing difficulty • Lower precision than solid carbide rollers • Not suitable for extreme impact conditions

Many processing scenarios in industrial production place extremely stringent requirements on roller surfaces, which ordinary steel rollers, stainless steel rollers, and chrome-plated rollers often cannot meet. This is the fundamental reason for the emergence of carbide-coated rollers.