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   Tungsten Carbide Rollers (also called tungsten carbide roller rings) refer to rollers made of tungsten carbide and cobalt as materials by powder metallurgy. Cemented carbide rolls are available in two types: integral and combined. Superior performance, stable quality, high product processing accuracy, good wear resistance and high impact resistance.

   After the advent of powder metallurgy technology in 1909, it was born with the development of metal processing industry. Since the introduction of hard alloy Wire Drawing Dies in Germany in 1918, it has stimulated research on hard alloys in various countries, and rolls of various uses have also appeared one after another. However, a large number of applications of cemented carbide rolls were after 1960. In 1964, the first high-speed twistless wire rod rolling mill of Morgen was born, which increased the finishing speed of wire rod by 4 times. Because the finishing mill works under high speed and high stress, the wear resistance of cast iron rolls and tool steel rolls is poor, the life of the groove is short, and the repair and unloading of rolls are very frequent, which affects the efficiency of the rolling mill and is no longer suitable for finishing production. Requirements, so it was replaced by combined carbide rolls. There are more than 200 sets of Morgan rolling mills in the world, which consume hundreds of tons of cemented carbide rolls annually.

   Cemented carbide rolls have high hardness, and the hardness value changes little with temperature. The hardness value at 700 ° C is 4 times that of high-speed steel; the elastic modulus, compressive strength, flexural strength, and thermal conductivity are all More than 1 times higher than tool steel. Due to the high thermal conductivity of the cemented carbide roll, the heat dissipation effect is good, and the time for the roll surface to be at a high temperature is short, so the high temperature reaction time of the roll with harmful impurities in the cooling water is short. Therefore, cemented carbide rolls are more resistant to corrosion and thermal fatigue than tool steel rolls.
Cemented carbide rolls are developed on the basis of cemented carbide tools. It is a refractory metal compound (WC, TaC, TiC, NbC, etc.) as the matrix, and transition group metals (Co, Fe, Ni) as The bonded phase is a cermet tool material prepared by powder metallurgy. It has a series of excellent properties such as high hardness, high red hardness and high wear resistance. Sometimes in order to obtain corrosion resistance, a certain amount of nickel, chromium and other elements are added accordingly.
The performance of cemented carbide rolls is related to the content of the bonding phase metal and the size of the matrix phase-tungsten carbide particles. Different cement content and corresponding tungsten carbide particle size form different cemented carbide grades. A series of cemented carbide grades suitable for different sorts have been developed. Tungsten carbide accounts for about 70% to 90% of the total composition mass in the cemented carbide, and its average particle size is 0.2 to 14 μm. If the content of the metal binder is increased or the particle size of tungsten carbide is increased, the hardness of the cemented carbide decreases and the toughness increases. The flexural strength of cemented carbide rolls can reach more than 2200 MPa, the impact toughness can reach (4 ~ 6) × 106 J / m2, and the Rockwell hardness HRA is 78 ~ 90.
Cemented carbide rolls can be divided into two types: solid carbide rolls and composite cemented carbide rolls. The solid carbide rolls have been widely used in the pre-finishing and finishing stands of high-speed wire rod mills (including fixed-reducing stands, pinch roller stands), etc. The composite cemented carbide roll is composed of cemented carbide and other materials, and can be divided into cemented Carbide Composite Roll ring and integral cemented carbide composite roll. The cemented carbide composite roll ring is installed on the roll shaft; the overall cemented carbide composite roll casts the cemented carbide roll ring directly in the roll shaft to form a whole, which is applied to the rolling mill with large rolling load

Tungsten Carbide Rollers

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