graphite electrodes Archives - Page 2 of 2 - Graphite Electrode Manufacturer

Configuration of Graphite Electrodes for Steelmaking Electric Arc Furnaces

In the configuration of Graphite Electrodes for Steelmaking Electric Arc Furnaces, it is necessary to follow the basic principle of “normal power electric furnaces with ordinary power graphite electrodes, high-power electric furnaces with high-power graphite electrodes, and ultra-high-power electric furnaces with ultra-high-power graphite electrodes“.

Configuration Scheme of the Graphite Electrode for AC Steelmaking Electric Arc Furnace

For AC steelmaking electric arc furnace,

The 10~30t electric furnace is equipped with graphite electrodes with a diameter of 300~400mm.
The 30-50t electric furnace is equipped with graphite electrodes with a diameter of 450mm.
The 60~80t electric furnace is equipped with graphite electrodes with a diameter of 500mm.
The 100~170t electric furnace is equipped with graphite electrodes with a diameter of 550~600mm.
The 200t electric furnace is equipped with graphite electrodes with a diameter of 600~700mm.
The 250~300t electric furnace is equipped with a 700mm diameter graphite electrode.

RS High Quality Graphite Electrode — RS High-Quality Graphite Electrode

Configuration Scheme of the Graphite Electrodes for DC Steelmaking Electric Arc Furnace

For DC steelmaking electric arc furnace,

The 30t electric furnace is equipped with graphite electrodes with a diameter of 450mm.
The 60t electric furnace is equipped with graphite electrodes with a diameter of 500mm.
70~80t electric furnace is equipped with graphite electrodes with a diameter of 600mm.
The 100~130t electric furnace is equipped with a 700mm diameter graphite electrode.
The 150t electric furnace is equipped with graphite electrodes with a diameter of 750mm.

uhp graphite electrode — UHP graphite electrode

Rongsheng Group, one of the graphite electrodes suppliers, provides you with Graphite Electrodes for Steelmaking Electric Arc Furnaces.

FAQ1 How to choose the electrode correctly in the electric arc furnace steelmaking?

According to the design characteristics of the electric arc furnace, reasonably select the electrode that meets the production of the electric arc furnace, and select the product with the best cost performance. It is very necessary to carefully select the electrode suitable for each furnace. The special performance of the steelmaking furnace, the feeding method, the maximum current intensity, the length of the electrode column under the holder, the distance between the sidewall of the furnace and the electrode circumference, etc., are all factors that must be considered when choosing the electrode for the electric arc furnace.

FAQ2 Why is the electrode required to be parallel and centered with the top hole of the furnace cover when steelmaking in an electric arc furnace?

The electrode column and the top hole of the furnace cover should be centered. The electrode column should avoid friction with the furnace cover, otherwise, friction with the furnace cover during lifting and lowering will cause the furnace cover to break the electrode. For AC furnaces, the three-phase electrode columns should be kept as parallel as possible.

FAQ3 What effect does the resistivity performance have on the use of electrodes in steelmaking?

The resistivity of the graphite electrode is a physical index that reflects the conductivity of the electrode and is related to the manufacturing process of the electrode. The country has qualitatively specified values for the resistivity of graphite electrodes of different specifications. Generally speaking, when steel mills choose electrodes of certain specifications, they must choose the resistivity range specified by the national metallurgical standards. Too high resistivity will cause the electrode to become red and hot when it is energized, and increase electrode oxidation consumption.

350-500mm Quasi-Ultra High Power Graphite Electrodes

In 2002, some customers have asked whether a new variety of graphite electrodes with properties between UHP graphite electrodes and HP graphite electrodes could be manufactured? In this way, it can not only meet the production needs of ultra-high power refining furnaces but also have a relatively large price drop compared to the UHP electrode. However, there is a carbon company that fulfills these customers’ demands. They have developed a new variety of graphite electrodes between ultra-high power graphite electrodes and high-power graphite electrodes, quasi-ultra high power graphite electrodes. This graphite electrode product requires various physical and chemical performance indexes to reach or be close to the UHP graphite electrode, but the production cost is greatly reduced so that the sales price also drops significantly.

Brief Introduction of Quasi-Ultra High Power Graphite Electrode

The properties of quasi-ultra high power graphite electrodes are between the high power graphite electrodes and ultra-high power graphite electrodes, close to those of UHP graphite electrodes, which can meet the demand of UHP graphite electrodes for LF and high power graphite electrodes for electric are furnace, and reduce the cost of the production of HP graphite electrodes and ultra-high power graphite. The technologic processes for φ350 ~ φ500mm quasi-ultra high power graphite electrodes were introduced, which were made from imported high-ranking/ordinary needle cokes to a scale in some carbon manufacturer. The results show that the properties of products obtained are close to those of ultra-high power graphite electrodes, and can meet the demand of ultra-high power graphite electrodes for LF.

Characteristics of Quasi-Ultra High Power Graphite Electrode

(1) The calcined coke produced by China’s domestic petroleum coke and the imported ordinary-grade needle coke is mixed in a certain proportion. The physical and chemical indexes of the produced quasi-ultra-high-power graphite electrodes have all met the requirements of the enterprise standard Q/140200DNT001-2007 “Quasi-ultra-high-power graphite electrodes“, and the trial production effect has reached the expected target.

(2) The sample analysis report proves that the performance index of the quasi-ultra-high-power graphite electrode is close to that of ultra-high-power graphite electrode, which can meet the production needs of ultra-high-power refining furnace.

(3) Finally, because part of the raw materials used by China-made petroleum coke, the production cost of quasi-ultra-high-power graphite electrodes is significantly lower than that of ultra-high-power graphite electrodes. Therefore, the selling price of quasi-ultra high-power graphite electrodes has also been reduced. From the customer’s perspective, it can effectively reduce the production cost of ultra-high power refining furnaces.

What are Graphite Electrodes?

What are graphite electrodes? Graphite electrodes are kind of conductive material in electric arc furnace steelmaking production. The graphite electrodes are mainly made of petroleum coke and needle coke as raw materials, and coal pitch is used as a binder, and is made by calcination, batching, kneading, pressing, roasting, graphitization, and machining. Due to some special properties of graphite. It is a conductor that releases electrical energy in the form of an electric arc to heat and melt the charge in the electric arc furnace. According to its quality index, it can be divided into rp graphite electrode, high power graphite electrode and ultra high power graphite electrode.

What are the graphite electrodes?

Rp graphite electrode, produced with ordinary grade petroleum coke. Graphitization temperature is low, its resistivity is high, the coefficient of linear expansion is large, and its thermal shock resistance is poor, so the current density is allowed to be low.

HP graphite electrode, produced with high-quality petroleum coke (or low-grade needle coke). Sometimes the electrode body needs to be dipped. Its physical and mechanical properties are higher than those of ordinary power graphite electrodes, such as low resistivity, which allows a large current density.

UHP graphite electrodes must be produced with high-grade needle coke. And the graphitization heat treatment should be carried out in the internal graphitization furnace. The graphitization temperature is as high as 2800 ~ 3000 ° C. Therefore, the resistivity is lower, allowing greater current density, the linear expansion coefficient is smaller, and has excellent thermal shock resistance.

The main raw material for the production of graphite electrodes is petroleum coke. A small amount of pitch coke can be added to rp graphite electrodes, and the sulfur content of petroleum coke and pitch coke cannot exceed 0.5%. Needle coke is also needed when producing high-power or ultra-high-power graphite electrodes. The main raw material for the production of aluminum anodes is petroleum coke, and the sulfur content should be controlled not more than 1.5% to 2%. Petroleum coke and asphalt coke should meet the relevant national quality standards.

Graphite Electrode used in DC Electric Arc Furnace

The development of electric furnace steelmaking technology, the enlargement of electric furnaces, the increase of electric power per unit furnace capacity and the use of DC electric arc furnaces have constantly put forward new requirements for the variety and performance of graphite electrodes. The use of high-power and ultra-high-power electric furnace steelmaking can shorten the furnace melting time, improve production efficiency, reduce power consumption and reduce graphite electrode consumption.

RS Graphite Electrode Manufacturers

RS Group, one of the Graphite electrode manufacturers, supply rp, hp, uhp graphite electrodes to the steelmaking plant. And our customer has been more than 60 countries anf areas all over the world. If you are want to buy the rp graphite electrode, please contact us, we will reply you as soon as possible.

Tag: graphite electrodes