How are tungsten carbide rolls produced?

December 02, 2022

How are tungsten carbide rolls produced?

Roll made from tungsten carbide and cobalt etc. by powder metallurgy, it was born in 1909 after the introduction of powder metallurgy technology and with the development of the metalworking industry. Due to the high speed and high stress of the finishing rolling unit, cast iron rolls, tool steel rolls (poor wear resistance, short life of the groove, frequent repair and loading, affecting the efficiency, has not adapted to the requirements of the finishing production) have been replaced by combined tungsten carbide rolls. Let us understand together how tungsten carbide rolls are produced?

Tungsten carbide rolls are produced by powder metallurgy using tungsten carbide powder and cobalt powder (a small amount of other hard phases or alloying elements can also be added) as raw materials. The two powders are mixed by wet grinding in a ball mill. After mixing, the material is dried and sieved to become the intermediate product - the carbide mix. The mixture is then pressed and sintered to form a roller blank. The roll blanks are polished or slotted to produce rolls by grinding processes.

With the high speed of wire rod finishing, people are exploring ways to improve the hardness and strength of tungsten carbide rolls. This is mainly in the tungsten carbide roll to add a small amount of TaC, NbC and Ni, Cr, Mo and other elements; and through the hot isostatic pressing system, vacuum sintering a low-pressure hot isostatic pressing system, heat treatment and other means to produce better quality rolls.

Tungsten carbide rolls

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