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UHP Graphite Electrode

uhp graphite electrode
UHP graphite electrodes are used for ultra-high power smelting and high-load ladle furnaces. This electrode is characterized by a low electrical resistivity and a high permissible current load. In the electric arc furnace steelmaking process, the current density allowed to pass is greater than 25A/cm2. The production of it uses needle coke as raw material, and multiple impregnation and roasting are used in the production process. With the rapid development of electric furnace steelmaking, high-power and ultra-high-power electric arc furnaces are becoming more and more popular. Because of this,  ultra high power (UHP) graphite electrodes with diameters greater than 600mm will dominate the market.

Applications

It is used for electric arc furnace (EAF) steelmaking. This is a process in which graphite electrodes are used as conductors, and three-phase alternating current is used as a power source. Electric arcs are generated between  electrodes and metal materials, and then the high temperature of the arcs is used to heat and melt the furnace materials.

They are mainly used in DC electric arc furnaces, AC electric arc furnaces and ladle refining furnaces. The purpose of refining is to improve the quality of steel,this process uses the arc generated between the electrode and the molten steel to heat the EAF steelmaking.

Graphite electrodes for AC electric arc furnace          UHP graphite electrode in DC electric arc furnace          Graphite electrodes for ladle refining furnace

( In AC electric furnace)                                        (In DC electric furnace)                                                    (In Ladle refining furnace)

 

Why use needle coke?

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 at least 70%, and the needle coke determines the price of it.

 

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 electrode has a slow oxidation rate.

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

UHP Graphite Electrode Unit Diameter
12”-16” 18”-22” 24”-26” 28”-32”
Specific resistance Electrode μΩ·m

6.0 6.5 6.5 5.5
Nipple 5.0 5.5 5.5 4.5
Transverse strength Electrode ΜРa

11.0 10.5 10.5 11.0
Nipple 16.0 15.0 15.0 16.0
Elastic modulus Electrode GРa

14.0 14.0 14.0 14.0
Nipple 18.0 18.0 18.0 18.0
Bulk Density Electrode g∕㎝3

1.65 1.65 1.66 1.68
Nipple 1.76 1.76 1.74 1.75
C.T.E

(100~600℃)

Electrode 10-6∕℃

1.5 1.5 1.4 1.4
Nipple 1.4 1.4 1.3 1.3
Ash content % 0.2 0.2 0.2 0.2

 

Allowable Current-Carrying Capacities

Nominal UHP Graphite Electrodes
mm inch Current-Carrying

Capacity(A)

Current Density

(A/cm2

300 12 15000~22220 20~32
350 14 20000~30300 20~32
400 16 25000~40400 19~32
450 18 32000~45450 19~29
500 20 38000~55550 18~29
550 22 42000~64640 17~28
600 24 50000~76760 17~27
700 28 70000~91000 18~24

 

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