UHP graphite electrodes are used in EAF and LF, and electric arc furnace steelmaking is one of the important steelmaking methods. The arc zone temperature of the electric arc furnace is as high as -°C. It heats up quickly and can melt various high melting point alloys. The real value of this process is in making steel using all scrap steel or all solid metal.
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Ultra-high power generally refers to the power of an electric furnace transformer being 2-3 times that of an ordinary electric furnace of the same tonnage, so it is relative. As the power is doubled, the main advantages of ultra-high-power electric furnaces are to shorten the melting time and increase productivity; to improve electric heating efficiency and reduce power consumption; and to be easily matched with refining outside the furnace and continuous casting to achieve high production, high quality, and low consumption. The smelting cycle is less than 60 minutes and the power consumption is less than 400kwh/t.
Graphite electrode working
Its function is to introduce electric current into the furnace and generate an arc with the charge to convert electrical energy into heat energy. When the graphite electrode is working, it must conduct a large current, and at the same time, it will be affected by high temperature, furnace gas oxidation, and collapse material impact, which requires it to work normally under the harsh conditions of smelting.
Physical performance requirements
It has good electrical conductivity, high current density (28-15A/cm2), and small resistance coefficient (8-10Ω mm2/m). The electrode has high thermal conductivity, small linear expansion coefficient and small elastic modulus to improve its thermal shock resistance. Sufficient mechanical strength at high temperatures The shape is regular, the surface is smooth and the curvature is small, ensuring a good connection with the nipple. High volume density, small porosity, good oxidation resistance, and not easy to oxidize, sublimate or melt under arc high temperatures.
UHP graphite electrode for Electric arc furnace
About consumption rate
The consumption rate of graphite electrodes and the production rate of molten steel during the steelmaking process are affected by many factors, including electrode quality, furnace type, operating conditions, etc. Generally, the consumption rate of an electrode can be estimated by the following formula:
Electrode consumption rate=Electrode consumption /Amount of molten steel produced×100%
The specific electrode consumption is usually determined by factors such as the diameter of the electrode, current density, and furnace temperature. Electrode consumption accounts for 8%-10% of the production cost of electric furnace steel, and the electrode consumption level per ton of steel is 4-9kg. The main reasons are breakage, oxidation, erosion of slag and furnace gas, as well as spalling and sublimation under the action of arc.
Specific measures to reduce electrode consumption include the following:
Reduce electrode breakage and damage caused by mechanical external force and electromagnetic force The electrodes should be stored in a dry place and protected from moisture, as they may easily fall off and peel off at high temperatures. Reduce the electrical loss of the electrode connector, and the nipple will be more firmly connected when driven into the pin. Reducing oxidation consumption can enhance furnace sealing and shorten high-temperature refining time.
In short, graphite electrodes are indispensable in the electric arc furnace steelmaking process. Quality is the key. Optimizing the smelting process during the production process can reduce the consumption of tons of steel and achieve maximum conversion rate and benefits.
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Product Description
Super High Power Graphite Electrode mainly comes from domestic petroleum coke and imported needle coke, which is widely used in electric arc furnace, ladle furnace, submerged arc furnace, etc. to produce alloy steel, metal and non-metal materials.
Our graphite electrodes include normal power, high power, special high power and ultra high power. They have the characteristics of low electrical resistivity, good electrical and thermal conductivity, high oxidation and thermal shock resistance, and high mechanical strength. Our factory offers various sizes and grades to meet customer requirements for specific applications.
In order to meet the requirements of higher work efficiency and lower total cost, large-capacity ultra-high-power electric arc furnaces are becoming more and more popular. Therefore, Super High Power Graphite Electrode with a diameter of more than 500 mm will dominate the market.
Super High Power Graphite Electrodes features:
&#; Lower electric resistivity, good electric and heat conductivity;
&#; High mechanical strength under high temperature;
&#; High resistance to thermal shock and mechanical vibration;
&#; Lower ash content;
&#; According to the customer's feedback information, our electrodes used in EAF/LF with the pretty lower consumption per ton steel.
Applications of Super High Power Graphite Electrode:
Electric furnace steelmaking is the main purpose of High Power Graphite Electrodes. At present, the output of electric furnace steel accounts for about 18% of the output of crude steel, and graphite electrodes for steelmaking account for 70% to 80% of the total consumption of graphite electrodes. A High Power Graphite Electrode is used to introduce electric current into the furnace, and is used for smelting through a high-temperature heat source generated by the arc between the electrode end and the electric charge.
The ore thermoelectric furnace is mainly used to produce industrial silicon, yellow phosphorus, etc. Its characteristic is that the lower part of the conductive electrode is buried in the charge to form an arc in the charge layer, and the resistance generated by the thermal charge itself is used to heat the charge. For example, about 100 kg of graphite electrodes are needed to produce 1 ton of silicon, and about 40 kg of graphite electrodes are needed to produce 1 ton of yellow phosphorus.
Graphitization furnaces for the production of graphite products, furnaces for melting glass and electric furnaces for the production of silicon carbide are all resistance furnaces. The material in the furnace is both a heating resistor and a heated object. Graphite electrodes generally used for conducting electricity are buried in the furnace wall at the end of the resistance furnace, and the graphite electrodes used here are for discontinuous consumption. Ladle furnace graphite electrodes are reasonably priced, welcome to consult.
High Power Graphite Electrode blanks are also used to process special graphite products such as various crucibles, molds, containers and heating bodies. For example, in the quartz glass industry, 10t graphite electrode blanks are required for every 1t molten tube. It takes 100 kilograms of graphite electrode blanks to produce 1 ton of quartz bricks.
Sinometal products with high strength, good conductivity and thermal shock resistance, low consumption are widely used in metallurgical Industries all over the world. In last decade, our products are exported to Southeast Asia, Japan and South Korea, Europe, Africa and other area for total more than 30 countries. We have a team of dedicated experts who are passionate about the Graphite technology and also on-site service technicians who are very experienced in a variety of furnaces, which is a distinct advantage for the users.
Super High Power Graphite Electrode Specification
Item
Unit
Nominal Diameter
UHP
HP
RP
Φ300-400
&#;Φ450
Φ250-400
&#;Φ450
Φ250-400
Φ450-600
Electric Resistivity
electrode
μΩ·m
&#;5.0
&#;5.5
&#;6.0
&#;6.5
&#;8.5
&#;9.0
Nipple
&#;4.0
&#;4.5
&#;5.5
Transverse Strength
electrode
MPa
&#;15.0
&#;10.5
&#;8.0
&#;7.0
Nipple
&#;24.0
&#;20.0
&#;16.0
Young's Modulus
electrode
GPa
&#;14.0
&#;12.0
&#;9.3
Nipple
&#;18.0
&#;16.0
&#;14.0
Bulk Density
electrode
g/cm3
&#;1.68
&#;1.65
&#;1.54
Nipple
&#;1.76
&#;1.74
&#;1.70
Coefficient of thermal expansion
electrode
10-6/ºC
&#;1.5
&#;2.0
&#;2.5
Nipple
&#;1.2
&#;1.6
&#;2.0
Ash
%
&#;0.2
&#;0.2
&#;0.2