Cemented carbide rolls are developed on the basis of cemented carbide tools. Cemented carbide is sintered with hard tungsten carbide particles and bonded phase metals such as nickel and cobalt. The performance of cemented carbide depends on the size of tungsten carbide particles and the content of the binder phase metal. When the binder phase metal contains a corresponding amount of nickel and chromium, it will not only greatly improve the thermal fatigue resistance of the roll, but also improve the corrosion resistance of the roll. The hardness of the cemented carbide roll is generally controlled at 78HRA-85HRA, and it is usually composed of a cemented carbide roll ring and a roll shaft.
Tungsten carbide roll rings are used in the finishing stands of high-speed wire mills, as well as the pre-finishing stands of some high-speed wire mills and the finishing stands of bar mills. The advantages of cemented carbide rolls are high hardness and good wear resistance. The amount of steel rolled in a single groove can reach twice that of high-speed steel rolls. At present, it has advantages over other materials in the finishing stand of high-speed wire rolling mills; the disadvantages are low toughness and high brittleness. When it is used in the finishing stand or reducing sizing stand of the bar mill, due to the large size of the rolled material and the heavy load carried by the roll ring, the roll ring is often broken due to the impact of the stack of steel or the low-temperature head of the rolled material. The high-speed steel roll takes into account the wear resistance of the cast iron roll and the strength and toughness of the cemented carbide roll.
