UHP graphite electrodes are used for electric arc furnace 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/cm 2 . The production of uhp graphite electrode 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 popular. We manufacturer and supply graphite electrodes with diameters ranging from 250-600 mm with nipples.
UHP graphite electrode is mainly used for smelting scrap steel in eaf steelmaking production. As a high-temperature resistant conductor, it can easily melt various high-melting-point alloys in the arc temperature zone (up to 3000-6000 °C ) in the electric arc furnace connected to a three-phase transformer.
UHP graphite electrodes can also be used in ladle refining furnaces, continuous casting and other processes. 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 electric arc furnace steelmaking. This will help steel mills achieve high production, high quality and low consumption.
( In AC electric furnace) (I n DC electric furnace) (In Ladle refining furnace)
Please provide the basic parameters of the electric arc furnace or ladle furnace:
Furnace Type: 150/200/200-ton class (Single Unit) Transformer: 20–60 MVA Heating Rate: 4°C/min Electrode Arm Type: PCA (Conductive Arm) Material: Copper-clad Steel Pitch Circle Diameter: 900 mm Maximum Electrode Current: 43.8 kA
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, reducing power loss.
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. Therefore they 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.
Advantages:
The resistivity of UHP graphite electrode is the lowest among all electrode types. This means that it can pass higher density current without breaking or deforming during arc furnace smelting.
Zhoushang Graphite uses needle coke in production to enhance the thermal shock resistance of the electrode itself. This makes it have a lower thermal expansion coefficient and can better resist rapid changes in temperature without being damaged.
The density of the double-impregnated UHP graphite electrode has been greatly improved. So, even at high temperatures, it oxidizes slowly, reducing the number of replacements.
Its diameter can be more than 750mm, which can meet the smelting needs of 100MT ultra-high power arc furnaces.
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.
Your professional UHP graphite electrode manufacturer
As a graphite electrode producer in China, Zhoushang Graphite has a complete production line, including raw material mixing, roasting, impregnation, graphitization, processing, etc. Our factory manufacture and supply high quality UHP grade graphite electrodes for your EAF steelmaking production.
UHP graphite electrode specifications:
| 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/cm 2 ） |
| 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 |
FAQS:
What are the different types of graphite electrodes?
Generally speaking, there are three types of graphite electrodes according to different powers, namely, UHP, HP, and RP. However, some manufacturers will produce SHP graphite electrodes. This grade of electrode is between HP and UHP grades, and its price is relatively low.
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