Author: graphelectrode.com

The production points of graphite electrode nipples have their own particularities. The thermal shock resistance of the nipples and the electrode body’s calcined product and the interface between the aggregate and the asphalt coke are different. In many areas, crack extension and extension easily occur in these areas during graphitization.

When producing ultra high power graphite electrode nipples, while considering the effect of “flatness” on nipple products, it is also necessary to realize that the interface between aggregate and asphalt coke is more widely distributed, and there are more weak areas. There are more potential structural defects between the focal interfaces and other factors.

The surface area of the uhp graphite electrode body is smaller than the nipple blank. The unit volume of the graphite electrode nipple blank is larger than that of the large-diameter electrode body blank. The nipple blank has a relatively large amount of heat dissipation. The temperature difference between the outer periphery of the nipple in series and the core is large. It is necessary to take technological measures to make up for the unfavorable factors such as the relatively large heat dissipation of the nipple blank and the large temperature difference between the periphery and the core.

For the production points of graphite electrode nipples, the conditions that each series of billets should meet are more stringent. To ensure the quality of the nipples, each series of columns must have the same temperature rise rate. The thermal insulation effect and the degree of heat loss of tandem columns in different spatial positions are different.

The quality of graphite electrodes and connectors of Rongsheng Graphite Electrode Factory is reliable. If you want to get the graphite electrode nipple price and manufacturer information of graphite electrodes, please contact us. We will get in touch with you in the shortest time.

With the increase of the proportion of electric furnace steel in the market, the demand for uhp graphite electrode has gradually increased. China’s needle coke resources are further strained, and its prices have been high and highly dependent on imports. This is not conducive to reducing the manufacturing cost of 350mm uhp graphite electrode.

What’s Raw Material used for the UHP Graphite Electorde Production? 

In order to reduce production costs, it is urgent to use Chinese needle coke instead of imported needle coke to produce uhp graphite electrodes. Chinese graphite electrode manufacturer, using Chinese domestic needle coke as raw material, adopts new formula and production process technology to carry out the research and development of φ 350mm UHP Graphite Electrode.

Chinese graphite electrode manufacturers, through optimizing the formula and making full use of the established production process and technical conditions, use Chinese domestic needle coke to produce φ350 mm uhp graphite electrode. It can fully meet the requirements of graphite electrode users.

The Advantages of the Chinese Needle Coke Raw Materials

1.  The Chinese-made needle coke, as the the raw material for the graphite electrodes, which has higher ash content, higher sulfur content, smaller particle strength, and smaller particle tap density.
2.  The graphite electrode produced from the Chinese needle coke raw material has the following physical and chemical properties: high bulk density, equivalent flexural strength, slightly lower elastic modulus, higher ash content, and higher resistivity.
3.  Passed the trial of the steel mill, the graphite electrode has good thermal shock resistance and oxidation resistance performance, which can fully meet the customer’s normal use requirements.
4.  Using uhp graphite electrode produced by Chinese-made needle coke, using large particle formula, the binder adopts medium-temperature modified asphalt or high-temperature modified asphalt, and adopts standard process. The level of the traditional process greatly reduces the production cost and improves the competitiveness of the product, thus achieving the purpose of replacing imported needle coke.

Conclusion

The test of producing φ350 mm uhp graphite electrode by using Chinese-made needle coke was successful. China’s domestic needle-shaped coke raw materials can be popularized for use on medium 400mm and φ450mm uhp graphite electrodes.

It can be seen from the above experiments that using domestic graphite electrode raw materials and through improved production technology, it has been possible to produce 350mm graphite electrode which can meet customer needs. If you have a demand for uhp graphite electrode, please contact us. We will reply to you as soon as possible.

UHP graphite electrodes are becoming more and more widely used. If you have an arc furnace project that requires uhp graphite electrode, or you want to get the latest graphite electrode price. Then, you need to learn more about the graphite electrode market.

First, you need to find the manufacturer of the graphite electrode. There are many graphite electrode suppliers, but not every supplier is a true manufacturer of graphite electrodes. Since the graphite electrode has a complicated production process and a relatively long production cycle, its production workshop covers a large area. A graphite electrode manufacturer that can have a large production workshop must be real.

Secondly, it is the quality of graphite electrodes. Due to the higher requirements of smelting in steel mills, the requirements for the quality of graphite electrodes are also higher. This requires rigorous quality inspection after graphite electrodes are machined. A full set of quality inspection equipment is also the quality guarantee required by the buyer.

In the end, the price of graphite electrodes is much more concerned. Due to the shortage of graphite electrodes in the previous period, the graphite electrode price continued to rise during that period. As this wave recedes, the graphite electrodes price does not seem to be as high as before. As a result, it seems that the demand for graphite electrodes is not as crazy as before. Therefore, it is relatively reasonable to buy graphite electrodes now.

When buying graphite electrodes, the most important thing is to meet the smelting needs of electric arc furnaces. Therefore, sometimes, uhp graphite electrode is not necessarily. However, for arc furnace electrodes with increasing requirements for smelting, it is still recommended to use high-quality uhp graphite electrode.

The relationship between graphite electrodes and steelmaking, is the graphite electrode usage. With the rapid economic development, the demand for special steels in various industries has become more and more extensive, resulting in the rapid development of electric arc furnace steelmaking technology. Large-capacity UHP eaf furnaces and large-scale external furnace refining technologies have become the symbol of modern steel . These electric furnaces use uhp graphite electrodes of different specifications. With the continuous improvement of the arc power and the continuous optimization of the smelting process technology, the physical and chemical indicators of eaf graphite electrodes are getting higher and higher, and the consumption indicators are getting lower and lower.

Judging from the average consumption level of large-scale and large-capacity ultra-high-power electric arc furnaces, the consumption of ton steel electrodes has dropped from an average of 3.5KG / T to 1.2KG / T in the past, while the average consumption of LF furnaces is less than 0.5KG / T . Because graphite electrodes occupy a certain proportion of cost in smelting and consume a large amount, all manufacturers pay great attention to the consumption and use of graphite electrodes, and they are also included in production as an important assessment index. The consumption and use of graphite electrodes in steelmaking.

Factors affecting graphite electrode consumption in smelting

In the steelmaking process, electric arc furnace smelting is divided into roughing and refining, but the graphite electrode transfers electric energy into the electric furnace and converts it into thermal energy to achieve the purpose of heating and melting solid charge. Roughing is an oxidation process with the purpose of melting scrap steel and exhausting harmful gases and impurities. Refining is a reduction process that adjusts steel grade elements and degassing to remove impurities by increasing temperature. It can be seen that electric arc furnace smelting uses graphite electrodes to adjust the furnace temperature to achieve the redox reaction and meet the steelmaking process requirements.

Development trend of smelting technology and electrode demand

The rapid development of electric arc furnaces in the steel industry has become a trend. Its characteristics are large output power, stable power coefficient, power transmission for long arc operation and development in the direction of energy saving. Therefore, the new large electric furnace has great changes compared with the traditional electric arc furnace in the past. Modern electric furnace technology pays great attention to the issue of electric furnace energy. The gas jet gun and automatic carbon oxygen gun can reduce the electrode consumption of 0.3 ~ 0.5KG per ton of steel. With the implementation of hot charging technology, the smelting time is significantly shortened, and the power consumption and electrode consumption are significantly reduced.

Large electric arc furnaces use large-capacity transformers and their overload capacity is 20%. From this point of view, the requirements for graphite electrodes in steel smelting are getting higher and higher, especially for the electrode’s quality balance, conductivity, thermal shock resistance, and oxidation resistance. Because the development of iron and steel has passed the threshold, it is developing in the direction of fine products and special varieties.

Large-scale DC and AC arcs have also been finalized; high-capacity, large-scale, large-scale blast furnaces supporting double-station LF furnaces have become a new development direction. In addition, large-scale furnaces have begun to take shape.

Now the market’s demand for graphite electrodes has developed towards multiple varieties and incremental directions. Among them: the annual demand for UHP graphite electrodes will reach 100,000 T; the annual demand for HP graphite electrodes is at least 180,000 T; the large specifications of HP graphite electrodes φ500MM and φ600MM are also moving in the direction of increase (mainly for furnaces) .

Graphite Electrode Manufacturer

RS graphite electrode manufacturer, according to the production characteristics of graphite electrodes, to provide customers with high quality graphite electrode products, rp/hp/uhp graphite electrodes. If you are in need of EAF Electrode, please contact us!

The graphite electrode is an important high-temperature conductive material for electric steelmaking, and the electric energy is input to the electric furnace through the graphite electrode. How is Graphite Electrode Made? RS Graphite Electrode Supplier will talk about the question.

The preparation process of graphite electrodes has been continuously developed with the improvement of steelmaking requirements. In general, graphite electrode manufacturers use petroleum coke and needle coke as aggregate, and coal asphalt as binder. A high temperature resistant graphite conductive material produced by a series of processes such as kneading, molding, baking, dipping, graphitization, and mechanical processing.

Graphite Electrode Production Process

1.Calcination

The carbonaceous raw material is heat-treated at a high temperature to discharge the moisture and volatile matter contained therein, and the production process for improving the original cooking performance is called calcination. Generally, the carbonaceous raw material is calcined by using gas and its own volatile matter as a heat source, and the maximum temperature is 1250-1350 °C.

Through calcination, the microstructure and physicochemical properties of the carbonaceous raw materials have undergone profound changes. Mainly reflected in the increase of coke density, mechanical strength and electrical conductivity, improve the chemical stability and oxidation resistance of coke, laid the foundation for the subsequent process.

2.Kneading

At a certain temperature, the quantitative carbonaceous pellets and powders of various sizes are stirred and uniformly mixed with the quantitative binder, and the process of kneading the plastic paste is called kneading.

3.Molding

The molding of the carbon material refers to a kneaded carbon paste which is plastically deformed under an external force applied by the molding apparatus. The process of forming a green body (or raw product) having a certain shape, size, density, and strength.

4.The Operation of Extrusion

Discharge the volatiles and reduce to a suitable temperature (90-120 ° C) to increase the adhesion, so that the blockiness of the paste is evenly favorable for molding. After molding, the green body needs to be inspected: bulk density, appearance tapping, profiling, and the like.

5.Baking

Calcination is a process in which a green product of a carbon product is placed under a protection of a filler and charged into a specially designed heating furnace for high-temperature heat treatment to carbonize the coal pitch in the green body. The bitumen coke formed after the coal pitch is carbonized, and the carbonaceous aggregate and the powder particles are consolidated together. The charcoal after calcination has high mechanical strength, low electrical resistivity, good thermal stability and chemical stability.

RS Graphite Electrode Supplier

Because of graphite electrodes have a wide range of applications in electric steelmaking. Although the graphite electrodes production process is complicated, the production cycle is relatively long. However, RS graphite electrode suppliers strictly review each production process and lay a solid foundation for the production of high quality graphite electrodes.

The RS graphite electrode supplier has undergone a rigorous graphite electrode production process. It has a high quality and is a graphite electrode product that can meet the high quality steelmaking needs. Feel free to contact us for more information on graphite electrodes. Want to learn more info about graphite electrode price, please mailto us now. We will get back to you as soon as possible.

We all know that ultra-high power graphite electrodes can refine molten steel, further remove impurities and improve purity. RS UHP Graphite Electrode for Sale in Russia. Provides reliable protection for high quality steel making. RS graphite electrodes have been sold to Russian country for many times and have received favorable comments from customers.

Graphite Electrode for Salse in RussiaThe use of high-power and ultra-high-power electric furnace steelmaking can shorten the melting time of the furnace, increase production efficiency, reduce electricity consumption and reduce the consumption of graphite electrodes. The industrial development of the Russian state, many steel mills need to use higher quality graphite electrodes to produce higher quality steel. Therefore, as a neighboring country, China provides high quality uhp graphite electrode for sale to Russia, which has a good geographical advantage.

When graphite electrode manufacturers produce graphite electrodes, especially in the production of uhp graphite electrodes, high-grade needle coke must be used, and the graphitization heat treatment should be carried out in the internal string graphitization furnace. The graphitization temperature is as high as 2800 ~ 3000 °C. Therefore, the uhp graphite electrode has a lower resistivity, allows a larger current density, has a smaller coefficient of linear expansion, and has excellent thermal shock resistance.

In the application field of graphite electrodes, the ore furnace is mainly used for the production of ferroalloys, pure silicon, yellow phosphorus, matte and calcium carbide. It is characterized in that the lower portion of the conductive electrode is buried in the charge. Therefore, in addition to the heat generated by the arc between the electric plate and the charge, when the electric current passes through the charge, heat is generated due to the electrical resistance of the charge. About 1.6kg of graphite electrode is consumed per ton of silicon, and about 40kg of graphite electrode is consumed per ton of yellow phosphorus.

Further, in the use of the graphite electrode, it is necessary to use graphite electrodes of different diameters depending on the size of the electric furnace. In order to continuously use the electrodes, the electrodes are connected by graphite electrode nipples. The graphite electrode for steelmaking accounts for about 70-80% of the total amount of graphite electrode.

In RS Graphite Electrode Manufacturer, graphite electrode has low resistivity, low ash, uniform structure, good thermal shock resistance, high mechanical strength, and heat. The advantages of low expansion coefficient, precision of graphite electrodes and garphite electrode nipples, etc. are excellent materials for electric steelmaking and ore furnace smelting. If you want to learn more about the uhp graphite electrode for sale, please contact us and we will get back to you in the shortest time.

To purchase HP graphite electrodes for steelmaking, find HP graphite electrode manufacturers. With ten years of steel processing with HP graphite electrode processing technology, quality assurance, the industry has sold tens of thousands of HP graphite electrodes for steelmaking. RS Manufacturer owns mature technology, advanced HP steel graphite electrode equipment, and perfect after-sales service have maintained a good reputation. Free Quote by Email: info@graphelectrode.com .

In electric furnace steelmaking, scrap steel is used as the main raw material, and three-phase alternating current is used as the power source. The electric current is heated and melted by the high temperature of the arc generated between the graphite electrode and the metal material, and is used to produce special steel and high alloy steel. The main method. At present, with the increasingly strict environmental protection, electric steelmaking has also shown a strong competitive situation in the field of general steel.

The HP graphite electrode for steelmaking, as the conductive electrode of the electric furnace steelmaking, plays an important role in the stable operation of the electric furnace steelmaking during the steelmaking process. The graphite electrode in the center of the DC arc furnace is added to the electric furnace as a cathode, and the bottom electrode is an anode. It is composed of two horizontal metals. The metal plate is provided with a gas-conducting cooling fin. Many stylus pins are attached to the metal plate, and magnesia is built between the stylus. filling. The current is introduced into the stylus through the horizontal metal plate at the bottom of the furnace and then passed into the molten pool. In this method, the consumption of the steelmaking electrode is relatively low, only half of the three-phase alternating current arc furnace, and the production cost is low, but the advantages and disadvantages coexist, and the combination of the graphite-magnesia brick is also easy to increase the carbon content.

Therefore, in the steel making process, the electrode oxygen consumption is minimized, the electrode sublimation consumption is reduced, the dissolution and spalling are reduced, the electrode is properly used, the breakage is reduced, and the electrode maintenance is enhanced, and the electrode consumption can be effectively reduced. . At the same time, the application of new processes and new technologies can also reduce their consumption indirectly.

In addition to HP graphite electrode products for steelmaking, Rongsheng also provides anti-oxidation high-power graphite electrodes, metallurgical furnace graphite electrodes, ultra-high power graphite electrodes (UHP), ordinary graphite electrodes (RP), high-power graphite electrodes (HP), UHP/HP400/ 450/550/600 ultra-high power graphite electrode, steelmaking electric furnace graphite electrode, electric arc furnace graphite electrode, EDM graphite electrode for electric discharge machining, etc. If you are looking for the hp graphite electrodes, please contact us. We will give you back as soon as possible!

Carbon graphite electrode is a general term for common graphite electrodes. Can be divided into natural graphite electrodes, artificial graphite electrodes and so on. Graphite electrodes are mainly used for electrodes for various electric arc furnaces; artificial graphite electrodes are also used for various electrolysis electrodes such as alkali metals and alkaline earth metals. In general, carbon graphite electrode is widely used in metallurgical, chemical and other industries.

Carbon Graphite Electrode Classification

Carbon graphite electrode can be mainly classified into the following six types depending on the production method, and they will be described one by one below.

(1) Natural graphite electrode.

The natural graphite electrode is an electrode produced from natural flake graphite. The natural graphite electrode can be prepared by adding coal pitch to natural graphite and kneading, forming, baking and machining. Its resistivity is relatively high, generally 15~20μΩ·m. The biggest disadvantage of this kind of carbon graphite electrode is their low mechanical strength, which is easy to break during actual use. Therefore, only a very small number of small-sized natural graphite electrodes are now available for some special applications.

(2) Artificial graphite electrode.

The petroleum coke or asphalt coke is used as a solid aggregate and coal tar pitch as a binder. After mixing, forming, roasting, graphitizing and machining, an artificial graphite electrode (abbreviated as graphite electrode) can be prepared. The artificial graphite electrode is a high temperature resistant graphite conductive material. According to different raw materials and production processes, the carbon graphite electrode with different physical and chemical properties can be prepared and divided into ordinary power graphite electrodes, high power graphite electrodes and ultra high power graphite electrodes.

(3) Anti-oxidation coated graphite electrode.

The anti-oxidation coated graphite electrode adopts “alternating spray-sintering method” or “solution impregnation method” to form an anti-oxidation coating on the surface of the processed graphite electrode to reduce the oxidation consumption of the graphite electrode. The price of this like carbon graphite electrode has been increased, and there are some problems in its use. Therefore, there is currently no widespread promotion of the use of anti-oxidation coated graphite electrodes in China.

(4) Water-cooled composite graphite electrode.

The water-cooled composite graphite electrode is a conductive electrode that is used after the graphite electrode is bonded to a special steel pipe. Since the operation of connecting the electrodes is troublesome and affects the production efficiency of the electric furnace, it has not been widely used at present.

(5) Hollow graphite electrode.

The hollow graphite electrode is directly pressed into a hollow tube when the electrode is formed or drilled at the center of the electrode during processing, and the other production processes are the same as those of the artificial graphite electrode. The production of hollow graphite electrodes can save carbonaceous raw materials and reduce the weight of the hoisted graphite electrodes. By using the hollow zone passage of the graphite electrode, it is also possible to add the alloy material and other materials required for steel making or to pass the required gas. However, the molding process for producing hollow graphite electrodes is complicated, the raw material saving is limited, and the preparation yield is low, so the hollow kind of carbon graphite electrode is not widely used.

(6) Regenerated graphite electrode.

The regenerated graphite electrode is prepared by using recycled artificial graphite scrap and powder as raw materials, and adding coal tar pitch by kneading, molding, roasting and machining. Relative to the coke-based graphite electrode, such a carbon graphite electrode’s resistivity is too large and its performance index is poor. At present, only a small number of small-sized regenerated graphite electrode products are used in the field of refractory production.

Carbon Graphite Electrode Manufacturer

In summary, most of the above graphite electrodes cannot be widely applied to actual production. Therefore, what we usually call, the carbon graphite electrode used in the smelting field can be considered as an artificial graphite electrode, that is, graphite electrode. RS graphite electrode supplier, to provide customers with high quality graphite electrode, if you need hp graphite electrodes, please contact us. We will respond to you in the shortest time.

The uhp graphite electrode (also called ultra-high power graphite lectrode) currently produced in China are 300mm, 350mm, 400mm, 450mm, 500mm, 550mm, 600mm, 650mm, and 700mm in diameters; the lengths are 1600mm, 1800mm, 2000mm, 2400mm, and 2700mm. RS Supplier, provide all kinds of graphite electrodes for customers. If you are looking for uhp graphite electrodes price, production processing, and the quality index, Email to US, we will give you back as soon as possible.

China’s graphite electrode quality standard (YB/T 4090 – 2000) has defined six physical and chemical indicators for the quality evaluation of uhp graphite electrode. Among them, Electrical Resistivity, Bending Strength, Elastic Modulus, Bulk Density and CTE(coefficient of thermal expansion) are used as indicators for quality assessment, and ash is used as a reference index.

UHP Graphite Electrode Physical and Chemical Index (Quality Standard)
Item	Unit	Diameter of electrode 300mm-600mm
		Standard		Actual measurement
		Electrode	Nipple	Electrode	Nipple
Electrical Resistivity, ≤	μOhm • m	7.0-7.5	6.5	6.5-7.0	5.0
Bending Strength, ≥	MPa	9.8-10.5	14	12-15	15-18
Elastic Modulus, ≤	GPa	12	16	12	14
Ash Content, ≤	%	0.3	0.3	0.3	0.3
Bulk Density, ≥	g / cm3	1.6	1.7	1.68-1.73	1.75
CTE(100-600℃), ≤	× 10-6 / ℃	2.4	2.2	2.2	2.0

RS Graphite Electrode Supplier, is a manufacturer of ultra-high power graphite electrodes. Our uhp graphite electrode products are produced in strict accordance with national quality standards. If you need a special quality index for graphite electrodes, please contact us with your quality requirements, we can customize graphite electrode products for you.