The concept of the tungsten carbide roller and its performance

A tungsten carbide roller is a roll made of tungsten carbide and cobalt etc. by powder metallurgy method. There are two types of carbide rolls: integral type and combined type. It has excellent performance, stable quality, high precision, good wear resistance, and high impact resistance.

Here is the content list:

l The concept of cemented tungsten carbide roller

l Performance of tungsten carbide roller

The concept of cemented tungsten carbide roller

With the increasingly fierce competition in the steel product quality and price market, steel companies are constantly updating their equipment technology to improve the rolling speed of mills; At the same time, how to reduce the number of mill downtime and further improve the effective operation rate of mills has become an important issue of concern to steel rolling engineers. The use of roll materials with higher rolling life is one of the important means to achieve this goal.

Tungsten carbide rollers have been commonly used in the production of bars, wire rods, rebar, and seamless steel pipe because of their good wear resistance, high-temperature red hardness, heat fatigue resistance, and high strength, which has greatly improved the effective operating rate of the mill. According to the differences in the working environment of each stand roll, various grades of tungsten carbide roller rings have been developed.

Performance of tungsten carbide roller

Tungsten carbide rollers have high hardness, and their hardness value changes little with the temperature, the hardness value at 700 ℃ is four times that of high-speed steel; and the modulus of elasticity, compressive strength, flexural strength, thermal conductivity are also higher than tool steel more than 1 times. Because of the high thermal conductivity of carbide rolls, so the heat dissipation effect is good, so the roll surface is at high temperature for a shorter period, so that the rolls with the cooling water of harmful impurities in the high-temperature reaction time are shorter. Therefore, carbide rolls are more resistant to corrosion and hot and cold fatigue than tool steel rolls.

Tungsten carbide rollers are developed based on cemented carbide tools, which is a kind of metal-ceramic tool material prepared by powder metallurgy with refractory metal compounds (WC, TaC, TiC, NBC, etc.) as the matrix and transition group metals (Co, Fe, Ni) as the bonding phase. It has a series of excellent properties such as high hardness, high red-hardness, and high wear resistance. Sometimes a certain amount of nickel, chromium, and other elements are added accordingly to obtain corrosion resistance.

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 binder content and corresponding tungsten carbide particle size form different grades of cemented carbide. Tungsten carbide has been developed as a series of carbide grades for different sorties. tungsten carbide accounts for about 70% to 90% of the total composition mass in carbide, and its average particle size is 0.2 to 14 μm. If the metal binder content is increased or the particle size of tungsten carbide is increased, the hardness of carbide decreases, and the toughness increases. The bending strength of carbide rolls can reach more than 2200 MPa, impact toughness can reach (4-6) × 106 J/m2, and Rockwell hardness HRA is 78-90.

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