Author: graphelectrode.com

Graphite electrodes are widely used in EAF furnaces, LF ladle refining furnaces, VD/VOD vacuum furnaces, iron alloy refining furnaces, ore-fired submerged arc furnaces. The specifications of the graphite electrodes, such as the diameter of the graphite electrode, also mainly determined by the production process and technical parameters of the different furnaces.

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The electric arc furnace inputs electric energy into the electric arc steelmaking furnace through the graphite electrode, and performs steelmaking by using an electric arc generated between the electrode end and the charging material as a heat source.

The electric arc furnace uses electric energy as a heat source, and can adjust the atmosphere in the furnace, which is extremely advantageous for melting steel materials containing many oxidizable elements. The high temperature flue gas of the electric furnace can be used for preheating the raw materials through technology and equipment to achieve high efficiency, energy saving, environmental protection and high yield.

With the improvement of electric arc furnace equipment and the improvement of smelting technology, the development of electric power industry, the cost of electric furnace steel is continuously reduced. Now electric furnace is not only used to produce alloy steel, but also used to produce ordinary carbon steel and iron concentrate pellets. Direct smelting, the proportion of steel produced by electric arc furnace smelting in the total domestic steel production continues to rise.

The specifications of graphite electrodes used in modern electric arc furnace steelmaking are mainly determined by the technical parameters of the steelmaking furnace production process. With the advancement of EAF steelmaking technology, steelmaking technology is developing in the direction of large-scale and ultra-high power, and the graphite electrodes matched with it are mainly large-size graphite electrodes and ultra-high-power graphite electrodes.

Generally, the graphite electrodes used in steelmaking furnaces are mostly ordinary power and high-power graphite electrodes. Now the use of ultra-high-power graphite electrodes is increasing year by year, accounting for almost half. The specifications of graphite electrodes are generally ∮300-∮500mm. At present, the use of large-size graphite electrodes of ∮550-∮800mm is also very large, and the length of graphite electrodes is generally between 1600-2700mm.

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Since the types, specifications, and lengths of graphite electrodes used in each steel mill and each electric furnace are different, they may sometimes vary greatly. As a manufacturer and seller of graphite electrodes, Rongsheng will provide steel mills with the most needed graphite electrodes according to the information and quality requirements of the graphite electrodes used by customers’ steelmaking furnaces. In addition, we also have information on the use of graphite electrodes for some steel mills, which can provide a reference for you to purchase graphite electrodes. Contact RS for more detials.

In the carbon industry, 550mm HP graphite electrodes are very common in steel smelting applications. RS Group is a professional graphite electrode production supplier, providing 550mm HP Graphite Electrode Price by China Manufactures for electric furnace steelmaking. As the market goes, the graphite electrode market is affected by many industries. Therefore, you can contact RS Group to provide you with the price of graphite electrode, which is only for reference. The specific order is subject to the contract order.

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The graphite electrode is a professional conductive material, and the division of the model is also carried out by the passed current. RS Group’s graphite electrode models are: ordinary power graphite electrode (RP), high power graphite electrode (HP), ultra high power graphite electrode (UHP). Their differences are mainly measured from: current, density, resistance, flexural strength, and ash.

RS Group 550mm HP Graphite Electrode Features

1. High body density
2. Low power consumption
3. Higher conductivity
4. Free consultation and installation
5. Full-time after-sales tracking
6. Unconditional return of quality problems

Reasons for Choosing Graphite as an Electrode
(1) Faster processing speed: Under normal circumstances, the mechanical processing speed of graphite can be 2~5 times faster than copper; and the electrical discharge processing speed is 2~3 times faster than copper;
(2)The material is less prone to deformation: the advantage of the processing of the thin rib electrode is obvious; the softening point of copper is about 1000 degrees, and it is easy to be deformed by heat; the sublimation temperature of graphite is 3650 degrees; the thermal expansion coefficient is only 1/30 of that of copper.
(3) Lighter weight: The density of graphite is only 1/5 of that of copper. When large electrodes are subjected to electrical discharge machining, the burden on the machine tool (EDM) can be effectively reduced; it is more suitable for application on large molds.

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550mm HP Graphite Electrode Price by China Manufactures – RS Group

RS Group is an industry-leading manufacturing company that manufactures, markets, exports and supplies high-power graphite electrodes. RS Group has always advocated the use of better materials and more advanced production processes to reduce energy consumption and material costs. Contact RS Group now, you will get more choice, lower prices, and faster delivery.

Packing of Graphite Electrodes

The main functions of package, is protecting electrodes from damage.

The packaging of the graphite electrodes, some will be separated electrodes and nipples, put them in different wooden cases; while the others may connect nipple in one end of the electrode, then delivered them to customers.

You can see some graphite electrodes wrapped in straws, or in the wooden boards. These are called: har-band package and wooden case package, can well protect electrodes from damage during storage and delivery, especially the integrity of thread part and end face.

Rongsheng Group can provide any kind of packages as per customer’s requirements.

The Delivery and Storage of Graphite Electrodes

After the graphite electrode is tested and packaged, it can be stored or delivery to customers who use graphite electrodes. It is also necessary to protect the integrity of the graphite electrode nipple and the screw thread during storage and shipping of the graphite electrode without being damaged.

1. During hoisting or moving the electrode, be carful to prevent the tilting of electrodes, which may cause graphite electrodes sliding or dropping.

2. To ensure the good condition of end face and electrode thread, please don’t use iron hook to hoist electrode by hooking electrode holes at two ends.

3. When unloading nipples wooden cases, handle them carefully to avoid the collision of nipples and the damage of threads.

4. Please don’t pile the electrodes and nipples directly on ground, put them on wooden pallet or iron rackets, so electrodes won’t collide with each other or adhere clay. For electrodes and nipples won’t be used soon, don’t remove the package, so dusts and other impurities won’t fall on threads or electrode holes.

5. Electrodes should be orderly piled in warehouse during storage, two sides of electrodes stack should be fixed by pads to avoid sliding. The height of the pile should not exceed 2 m.

6. During storage, keep the electrodes from rain and moisture. If the electrodes are damped, dry them first before using, or there may have cracking or addition of oxidization during steelmaking.

7. During the storage of nipples, keep them from high temperature, as high temperature may cause the melting of nipple pin.

In the graphite electrode industry, it is well known that the raw materials for the production of graphite electrodes are mainly petroleum coke, needle coke, and coal pitch. Among them, low-sulfur petroleum coke and coal-based needle coke are aggregates, coal pitch is used as a binder and an impregnating agent.

Raw Materials for Different Power Graphite Electrodes

RP, HP, UHP graphite electrodes have different aggregate requirements due to particular quality, and the selection demand for raw materials are also different.

In general, regular power graphite electrodes’ aggregates are petroleum coke. High-power graphite electrodes raw materials are composed of 70% high-quality petroleum coke and 30% needle coke. And, ultra-high-power graphite electrodes are 100% needle-shaped coke used.

Strictly Select Graphite Electrode Raw Materials

Rongsheng Group in the raw materials selection is exacting, in order to produce high quality graphite electrode products.

Petroleum coke

Petroleum coke is a petroleum product obtained by thermal cracking of heavy oil such as diesel oil or wax oil.

The petroleum coke color is black and porous, the carbon content accounts for more than 80%, and the ash content is generally below 0.5%. It is widely used in chemical and metallurgical industries, and is the main raw material for producing artificial graphite products and carbon products for electrolytic aluminum.

Petroleum coke can be divided into high sulfur coke (containing more than 1.5% sulfur), medium sulfur coke (containing 0.5% to 1.5% sulfur), and low sulfur coke (containing less than 0.5% sulfur). The production of graphite electrodes and other artificial graphite products is generally produced using low sulfur coke.

Rongsheng Group produces rp graphite electrodes, generally using low sulfur coke (such as petroleum coke with sulfur below 0.5%).

Needle coke

Needle coke is obtained by delayed coking and calcination of coal or oil feedstock.

The anisotropy of physico-mechanical properties of needle coke is very obvious. It has good electrical and thermal conductivity parallel to the long axis direction of the particle, and the coefficient of thermal expansion is low. When extrusion molding, the long axis of most particles is arranged in the extrusion direction.

The manufacture of high-power (hp) or ultra-high-power (uhp) graphite electrodes is generally based on needle coke. The finished graphite electrodes with low resistivity, small thermal expansion coefficient and good thermal shock resistance.

Coal pitch

The coal tar is obtained by refining or modifying the residual part of the coal tar after distillation.

Coal tar is one of the main products of coal tar deep processing. It is a mixture of various hydrocarbons, black high viscosity semi-solid or solid at normal temperature, no fixed melting point, softens after heating, and then melts, and the density is 1.25-1.35g/cm3.

According to its softening point, it is divided into low temperature, medium temperature and high temperature asphalt. The medium temperature asphalt productivity is 54-56% of coal tar.

Coal tar is used as a binder and impregnant in the carbon industry, and its performance has a great impact on the production process and product quality of carbon products. Rongsheng Group’s graphite electrodes binder asphalt uses medium or medium temperature modified asphalt with moderate softening point, high coking value and high β resin. The impregnating agent uses a medium temperature asphalt having a low softening point, a low QI, and good rheological properties.