Needle Coke gets its name because its crushed particles are like elongated needles. It is a high-quality coke with pronounced anisotropy and a lustrous long-fiber structure. Their molecular structure is arranged orderly and has suitable graphitization properties. At the same time, it has many advantages, such as low thermal expansion coefficient, porosity, and electrical conductivity.

Therefore, needle coke is a key raw material in the production process of ultra-high power graphite electrodes. The needle coke content of the UHP grade is 100%, and it determines the price of graphite electrode.

Main features

High temperature resistance: It can withstand high temperatures during the electric arc furnace (EAF) steelmaking process. Even in harsh high temperatures up to 3600 degrees Celsius, it will not melt or deform or be damaged under the action of strong arcs.

Low specific resistance: The specific resistance of the electrode body is below 5.0g∕㎝³, and the nipple is below 4.0g∕㎝³. At this time, the resistance to current is small and power loss is reduced.

High density: The overall structure has smaller porosity, reducing electrode consumption.

Good electrical conductivity: They have low ash content, are heat-resistant and corrosion-resistant, and are excellent conductive materials used in electric arc furnaces at high temperatures.

High mechanical strength: During the kneading process, the coke particles are mixed evenly and bonded firmly. Therefore, the flexural and compressive strength are high.

Small thermal expansion coefficient: Because needle coke is added during the production process, the blank is more easily graphitized at high temperatures above 2000℃. The better the degree of graphitization, the smaller the thermal expansion coefficient.

How to use?

• Please dry the wet UHP graphite electrode before use.
• Please remove the protective foam cover on the spare electrode hole. Then check whether the inner thread of the electrode hole is intact.
• Clean the spare electrode surface and the inner thread of the hole with compressed air.
• Please carefully screw the connector into the spare electrode end’s electrode hole.
• Please use the graphite spreader to screw the electrode holder into the electrode hole at the other end of the spare electrode.
• When connecting the electrodes, clean the nipples with compressed air when the two electrodes are 20-30cm apart.
• When twisting the it with a torque wrench, fully tighten it to the specified position.  So that the gap between the two electrodes is less than 0.05mm.

UHP Graphite Electrode Price.

It is important to note that the price of it may vary due to market conditions, supply and demand dynamics, and other external factors. In addition, the rising cost of raw materials such as needle coke has also driven the price.

Physical &Chemical Properties Of Electrode And Nipple

Allowable Current-Carrying Capacities