Cemented Alloy Tungsten Carbide Mill Roll for Sheet Wire Knurling

Tungsten Carbide Roll Rings

Tungsten carbide roller ring is a kind of metallurgical tool which consists of tungsten carbide and cobalt with high hardness and wear resistance. There are ideal for use in applications where strength, durability and longevity are factors. The performance of the tungsten carbide roller is related to the content of the bonding phase metal and the size of the matrix phase--the tungsten carbide powder particle.The different binder content and the corresponding tungsten carbide particle size form different carbide grades. If the content of the metal binder is increased or the particle size of the tungsten carbide is increased, the hardness of the cemented carbide decreases and the toughness increases. Tungsten Carbide (WC) is twice as strong as steel and is similar to corundum in hardness. Tungsten carbide rollers combine superior hardness with resistance to abrasion and wear and they are available in a wide range of sizes. They can also be milled according to the customer's specifications. It has advantage of high wear resistance, long life and high efficiency during the high speed rolling.
Cemented carbide roller used on the stretch reducing mill for bars, thread steel bars and common wire with the durability 10 to 20 times higher compared to common steel roller. The surface quality and the steel bar size accuracy are greatly improved. The cemented carbide roller reduces effectively the production cost and improves the quality.
Roller for Profile Wire Rolling, Flat Wire Rolling, Construction Wire Rolling, Plain Wire Rolling and Welding Wire Rolling, Wire Straightening, Wire Guiding etc.
Huijin is one of competitive tungsten carbide rolls manufacturers and suppliers, We wish to establish business relation with you.


Recommend grade list of tungsten carbide Rolls:
 
Product size reference:

*Other grades and sizes can be offered as per customers' requirements

Tungsten Carbide Rolls as the characters of high wear resistance, high corrosion resistance and good compressive properties which is an important parts in the steel bar and wire rod rolling. The rolls are primarily applied in high speed wire line, Kocks three roll mill, seamless pipe stretch reducing mill, three dimensional rolls for cold-rolled ribbed steel bar, and composite roll for hot-rolled bar screw thread steel etc.
Descaling rolls are made of tungsten carbide or steel and are used for the mechanical descaling of entry rod in reduction mills.Stress relieving rolls are made of tungsten carbide to improve the mechanical characteristics of the cold rolled wire.The roll-straightening process is a cold-forming process that uses rollers to provide uniform bending of wire and/or rod material to change its shape and possible other characteristics for use in subsequent processing.


Carbide production
The productionprocess of powder-metallurgical products basically includes the four steps of powder preparation, forming, sintering andfinishing.

Tungsten Carbide Roll Rings
The APT (ammonium para-tungstate) is calcined into tungsten oxide under high te-mperature. Subsequently the oxide is reduced to tungsten metal in a hydrogen  atmosphere. The metal powder is then mixed with carbon and carburised under inert atmosphere at high temperatures. The production parameters are decisive for the WC grain size in the sintered carbide.

Powder preparation
The tungsten carbide is intensely mixed with the binder metalcobalt, nickel or iron, various grain growth inhibitors and materials,
which promote compaction, by wet grinding so that a homogeneous suspension is created. Afterwards, the suspension is dried in a spray tower to produce a granulate with good flow characteristics. This granulate represents the basis for all forming processes.

Metal forming
The objective of the forming process is to obtain a near net shape sample. Pressing is normally carried out at room temperature with pressures reaching up to several tons per square centimetre.
There are several ways of pressing blanks:During isostatic cold pressing the powder is filled into an elastic flexible hose and pressed into a compacted form through high  liquid pressure. The powder blocks which are produced in this way can then be processed mechanically. All common machining methods like milling, cutting, drilling or turning may be applied.
In uniaxial pressing the pressing tool consists of a die and an upper and a lower punch. The carbide powder is filled into the die and then compacted to create the so called green carbide,which is ejected from the pressing die.Extrusion pressing is mainly used to produce rectangular bar or cylindrical rod, with or without axial hole(s). A plasticiser is added to the powder. The resulting paste is pressed through an extrusion nozzle. Before sintering, the plasticiser must be evaporated in special drying furnaces.Metal Injection Moulding (MIM) is a process used to produce more complex forms which cannot be produced by direct pressing. The paste preparation is similar to the extrusion process.

Sintering process
The sintering process converts the blank into a homogeneous and dense carbide with a high level of hardness. The material is sintered at temperatures between 1,300 and 1,500 °C (liquid phase sintering) and sometimes also at high pressure (up to 100 bar). The volume is reduced by up to 50 % during this process.

Finishing
In order to achieve the final requirements of surface finish, tolerances, etc. carbide parts can be subjected to a series of finishing processes such as grinding, spark erosion and coating.


Zhuzhou Huijin Cemented carbide Co., Ltd is located in Zhuzhou City, Hunan Province, China, where is the largest tungsten carbide producing area in China. Our main pr-oducts inclue: Tungsten carbide rods, carbide strips, carbide dies and bushes, tungsten carbide roll rings, carbide disc cutters, carbide end mill cutters, carbidestud and pins, tungsten water jet cutters, precision tools, tungsten carbide grits and powder, welding rods, ceramet inserts, PCD and CBN tools, non-standard and deep-processing products and so on. We also provide very good quality of boron carbide, silicon carbide nozzles. 
Technology and Quality creates a bright future.Looking forward to your cooperation! 



Our company gathered the professional staff members for designing, producing and saling. Our workers are well trained and experienced. Our team is honest, positive, keeping promise, working hard and carefully. We sincerely hope we can provide our clients with good quality, moderate price together with professional service. We have advanced equipment, test facilities and professional employees. We strictly carry on ISO9001: 2008 requirements to guarantee the quality.