Tag: UHP Graphite Electrodes

350mm UHP Graphite Electrode for Arc Furnace Efficiency by Rongsheng

350mm UHP Graphite Electrode for Arc Furnace: Performance, Manufacturing, and Application Value. In electric arc furnace (EAF) operations, graphite electrodes are among the most influential consumables affecting productivity, energy efficiency, and operational stability. As furnace technology evolves toward higher power input and shorter melting cycles, the demand for ultra-high-power electrodes continues to grow. Among commonly used specifications, the 350mm UHP graphite electrode for arc furnace plays a key role in medium to large EAF systems that require both high current capacity and stable arc performance.

From the perspective of Rongsheng Graphite Electrode Manufacturer, this article focuses on how UHP graphite electrodes, particularly the 350mm size, support modern EAF operations, how they differ from lower grades, and why choosing the right EAF graphite electrode supplier matters for long-term furnace efficiency.

uhp graphite electordes for Arc Furnaces
uhp graphite electordes for Arc Furnaces

Why 350mm UHP Graphite Electrodes Matter in EAF Operations

The 350mm diameter electrode is widely applied in electric arc furnaces operating under ultra-high-power conditions. These furnaces demand electrodes capable of carrying high current densities while maintaining mechanical strength and thermal stability.

Unlike smaller electrodes used in lower-power systems, a 350mm UHP graphite electrode must handle intense electrical loads, frequent temperature fluctuations, and mechanical stresses caused by arc movement and scrap charging. For these reasons, UHP grade electrodes are often preferred over HP or RP grades in furnaces seeking higher productivity and reduced melting time.

Core Performance Advantages of 350mm UHP Graphite Electrode for Arc Furnace

High Current-Carrying Capacity

One of the defining features of a 350mm UHP graphite electrode for arc furnace use is its ability to conduct large electrical currents with minimal resistive loss. Lower electrical resistivity allows the electrode to transmit power efficiently, supporting faster scrap melting and higher furnace throughput.

Excellent Thermal Shock Resistance

Electric arc furnaces experience rapid heating and cooling cycles. UHP graphite electrodes are engineered to withstand these sudden temperature changes without cracking or spalling, reducing the risk of unexpected electrode failure.

Strong Mechanical Stability

During EAF operation, electrodes are exposed to vibration, bending stress, and impact from scrap material. The dense internal structure of UHP graphite electrodes provides superior mechanical strength, helping maintain structural integrity throughout the melting process.

Stable Arc Performance

Arc stability is essential for controlled melting and energy efficiency. A high-quality EAF graphite electrode supports consistent arc formation, reducing power fluctuation and improving heat transfer within the furnace.

Manufacturing Focus Behind Reliable UHP Graphite Electrodes

The performance of UHP graphite electrodes depends heavily on manufacturing quality. From raw materials to final inspection, each step contributes to the electrode’s reliability in arc furnace applications.

Premium Raw Material Selection

UHP graphite electrodes require carefully selected petroleum coke and needle coke with low impurity levels. Needle coke quality is especially critical, as it directly affects electrical conductivity and thermal resistance.

Precision Forming and Baking

Uniform density is essential in a 350mm electrode. Advanced forming techniques ensure even compaction, while multiple baking stages strengthen the structure and reduce internal porosity.

High-Temperature Graphitization

Graphitization at extremely high temperatures transforms carbon material into crystalline graphite. This process significantly enhances conductivity and heat resistance, defining the UHP grade’s performance characteristics.

Accurate Machining and Inspection

After graphitization, electrodes are machined to precise tolerances, particularly at the nipple connection. Strict inspection procedures verify resistivity, density, strength, and dimensional accuracy before delivery.

Application of Graphite Electrodes for Steelmaking
Application of Graphite Electrodes for Steelmaking

Application Value of 350mm UHP Graphite Electrodes in EAF Systems

Primary Steelmaking in Electric Arc Furnaces

In EAF steelmaking, 350mm UHP graphite electrodes deliver the power needed to melt scrap efficiently. Their high current capacity allows operators to increase transformer power input while maintaining arc stability, improving overall productivity.

High-Intensity Melting Operations

Steel plants aiming to shorten tap-to-tap time often operate furnaces at higher power densities. UHP graphite electrodes support this approach by tolerating greater electrical and thermal stress without compromising service life.

Ladle Furnace and Secondary Refining

Although primarily associated with EAFs, UHP graphite electrodes are also used in ladle furnaces where precise temperature control is required. Stable heating contributes to better alloy adjustment and improved steel quality.

Alloy and Special Steel Production

Special steels often require higher melting temperatures and longer refining times. UHP graphite electrodes provide the durability and electrical stability necessary for these demanding production conditions.

Economic Impact of Choosing the Right EAF Graphite Electrode

Selecting the appropriate electrode grade influences not only furnace performance but also overall operating cost. While UHP graphite electrodes typically have a higher unit price, they often reduce total electrode consumption, minimize breakage, and lower energy usage.

For furnaces operating at ultra-high power, the use of 350mm UHP graphite electrodes can result in lower cost per ton of steel produced. Reduced downtime and improved furnace stability further enhance economic benefits over the long term.

Role of Graphite Electrode Suppliers in Furnace Performance

Reliable graphite electrode suppliers contribute more than product delivery. They provide technical support, consistent quality, and supply stability, all of which are critical for continuous furnace operation.

Professional suppliers help customers match electrode specifications with furnace parameters, including transformer capacity and operating power. This ensures that the selected EAF graphite electrode performs optimally under real operating conditions.

Rongsheng’s Approach as a Graphite Electrode Manufacturer

As an experienced manufacturer of UHP graphite electrodes, Rongsheng focuses on product consistency, manufacturing reliability, and customer-oriented service. With a physical factory, advanced production equipment, and strict quality control systems, Rongsheng supplies graphite electrodes to steel and metallurgical industries worldwide.

Rongsheng’s 350mm UHP graphite electrodes are designed to support high-power EAF operations by offering stable performance, long service life, and predictable consumption rates. This helps customers optimize furnace efficiency and reduce overall operating costs.

Industry Outlook for UHP Graphite Electrodes

As electric arc furnace technology continues to expand globally, demand for high-performance UHP graphite electrodes is expected to grow. Increased emphasis on energy efficiency, recycling, and low-emission steelmaking further strengthens the role of reliable EAF graphite electrodes in modern industry.

Manufacturers capable of delivering consistent quality and technical support will play a key role in supporting this transition.

Rongsheng UHP Graphite Electrode for Arc Furnace

The 350mm UHP graphite electrode for arc furnace applications represents a critical component in modern EAF operations. With high current capacity, strong thermal shock resistance, and stable arc performance, uhp graphite electrodes enable steel producers to operate at higher efficiency and productivity.

Choosing a trusted EAF graphite electrode manufacturer and supplier is essential for achieving long-term operational stability and cost control in high-power furnace environments.

For steel plants and metallurgical enterprises seeking reliable 350mm UHP graphite electrodes for arc furnace operations, Rongsheng offers proven manufacturing capability, consistent quality, and professional technical support.
Contact Rongsheng Graphite Electrode Manufacturer today to discuss your furnace requirements and discover how high-performance UHP graphite electrodes can enhance your production efficiency and operational reliability.

Why Choose Rongsheng for UHP Graphite Electrodes: Comprehensive Specifications and Benefits

In the rapidly evolving steelmaking and metallurgical industries, the need for reliable, high-performance materials has never been greater. Among the most critical components in electric arc furnaces (EAF) are ultra-high-power (UHP) graphite electrodes. Rongsheng Graphite Electrode Manufacturer is proud to offer a range of UHP electrodes, including UHP700, UHP500, and UHP300, designed to meet the stringent demands of modern industry. Our electrodes, available in lengths of 1800mm and diameters of 450mm, are the epitome of quality and performance.

UHP Graphite Electrode from Rongsheng
UHP Graphite Electrode from Rongsheng

The Role of UHP Graphite Electrodes in Steelmaking

Graphite electrodes serve as the conduit for electrical energy in EAF operations, converting electricity into heat to melt scrap steel or other raw materials. UHP-grade electrodes are specifically designed for high-power and ultra-high-power furnaces, where their superior thermal conductivity and mechanical strength ensure consistent performance under extreme conditions.

Key benefits of UHP graphite electrodes include:

  1. High Thermal Conductivity: Enables efficient heat transfer during operations.
  2. Excellent Mechanical Strength: Withstands mechanical and thermal stress in demanding environments.
  3. Low Electrical Resistivity: Ensures energy efficiency and reduces operational costs.

Specifications of Rongsheng UHP Graphite Electrodes

At Rongsheng, we understand that precise specifications are critical to the success of your operations. Here are the detailed features of our UHP700, UHP500, and UHP300 graphite electrodes:

  1. Dimensions and Sizes

  • Length: 1800mm
  • Diameter: 450mm
  • Grades: UHP700, UHP500, UHP300

  1. Material Composition

Our electrodes are made from premium-quality needle coke and petroleum coke, ensuring optimal purity and consistency. These materials are subjected to rigorous testing and high-temperature baking to achieve the desired structural integrity and performance.

  1. Mechanical and Electrical Properties

  • Bulk Density: High bulk density for durability and resistance to breakage.
  • Electrical Resistivity: Low resistivity for efficient conductivity.
  • Flexural Strength: Exceptional flexural strength for enhanced operational reliability.
  • Thermal Shock Resistance: Superior resistance to sudden temperature changes.

Applications of UHP Graphite Electrodes

Our UHP electrodes are versatile and suitable for a variety of applications, including:

  1. Steelmaking in EAF and Ladle Furnaces: Ensures consistent melting and refining processes.
  2. Alloy Production: Ideal for producing high-quality alloys due to their stability and efficiency.
  3. Non-Ferrous Metal Smelting: Handles the demands of smelting operations involving aluminum, copper, and other non-ferrous metals.
  4. Specialty Applications: Used in the production of silicon and phosphorus.

Why Choose Rongsheng Graphite Electrode Manufacturer?

Rongsheng has built a reputation for excellence in the production and supply of graphite electrodes. Here are a few reasons to partner with us:

  1. Advanced Manufacturing Facilities

We utilize state-of-the-art equipment and processes to produce electrodes that meet international standards. Our facilities are equipped for precision manufacturing, ensuring consistency and quality in every product.

  1. Strict Quality Control

From raw material selection to the final product, our electrodes undergo rigorous quality control procedures. This ensures that each electrode performs reliably under demanding conditions.

  1. Customized Solutions

We recognize that every operation is unique. Our team works closely with clients to provide tailored solutions that meet specific operational requirements.

  1. Global Reach

Rongsheng has supplied graphite electrodes to clients across more than 120 countries, including key markets in Europe, Asia, and the Americas. Our global distribution network ensures timely delivery and unparalleled customer service.

How to Place an Inquiry for UHP Graphite Electrodes

If you are interested in our UHP700, UHP500, or UHP300 electrodes with 1800mm length and 450mm diameter, here are the steps to place an inquiry:

Contact Us: Reach out via our website or email to discuss your requirements.

Provide Specifications: Share detailed specifications, including grades, dimensions, and operational needs.

Request a Quote: Receive a competitive quote tailored to your specifications.

Order and Delivery: Once the order is confirmed, our logistics team ensures timely and secure delivery.

Rongsheng Graphite Electrode Manufacturer

Our commitment to quality and customer satisfaction has earned us the trust of clients worldwide:

“Rongsheng’s UHP graphite electrodes have transformed our steelmaking operations. The quality and performance are unmatched.” — Steel Manufacturer, USA

“The team at Rongsheng provided excellent support, from inquiry to delivery. Highly recommended!” — Alloy Producer, Germany

Future-Proof Your Operations with Rongsheng UHP Graphite Electrodes

As the demand for high-quality steel and alloys continues to rise, ensuring the reliability and efficiency of your EAF operations is paramount. Rongsheng Graphite Electrode Manufacturer is here to provide the materials you need to stay ahead of the curve. Our UHP700, UHP500, and UHP300 electrodes offer the perfect balance of performance, durability, and cost-efficiency.

Contact us today to learn more about our products and how we can support your operations.

The Role of UHP Graphite Electrodes (600mm) in High-Performance Steelmaking

Introduction to UHP Graphite Electrodes. As industries push towards higher efficiency and sustainability, ultra-high-power (UHP) graphite electrodes have emerged as essential components in the steelmaking process, particularly in electric arc furnaces (EAFs). UHP graphite electrodes are designed to handle extremely high electrical currents and temperatures, making them ideal for intensive, high-output steel production environments. Among the various sizes of UHP electrodes, the 600mm diameter variant has gained significant popularity due to its ability to strike a balance between high performance and cost efficiency.

uhp graphite electordes for Arc Furnaces
uhp graphite electordes for Arc Furnaces

In this blog post, we will explore the benefits, applications, and technical aspects of UHP graphite electrodes, size 600mm—a key contributor to the modern steelmaking process.

UHP Graphite Electrodes: An Overview

Graphite electrodes, especially those classified as UHP, are made from high-quality petroleum coke and needle coke. These raw materials are processed through a series of operations, including calcining, milling, molding, baking, and graphitization. The final product is a highly conductive, durable, and heat-resistant electrode that can withstand the harsh conditions of electric arc furnaces.

UHP graphite electrodes are typically used in furnaces that require extremely high temperatures and electrical energy. They offer the highest current-carrying capacity among all types of graphite electrodes, making them indispensable in large-scale steel production facilities. Their ability to operate at high power levels without significant degradation ensures that production can continue efficiently, with minimal interruptions for electrode replacement.

The Importance of Size in UHP Graphite Electrodes

The size of the graphite electrode plays a crucial role in determining its efficiency, durability, and overall performance in the furnace. UHP electrodes come in various sizes, and the 600mm diameter option is particularly valuable in large-scale industrial applications.

UHP Graphite Electrode
Rongsheng UHP Graphite Electrode Manufacturer

Why the 600mm size?

    • Higher current-carrying capacity: The 600mm diameter allows the electrode to carry more current compared to smaller sizes, making it ideal for larger furnaces that operate at higher power levels. This size also provides greater surface area, leading to more efficient heat transfer during the steelmaking process.
    • Increased durability: UHP graphite electrodes with a 600mm diameter are less prone to breakage and wear, even under intense conditions. This durability results in fewer electrode changes and reduced furnace downtime.
    • Optimized performance: Larger electrodes, like the 600mm variant, contribute to improved operational stability. With a longer lifespan and higher electrical conductivity, these electrodes ensure that production can proceed smoothly and efficiently, reducing energy consumption.

Key Specifications of UHP Graphite Electrodes (600mm)

When we refer to a UHP graphite electrode, size 600mm, we are typically discussing an electrode with a diameter of 600mm and a length ranging from 2,400mm to 2,700mm. The length can vary depending on the specific furnace design and operational requirements. The key specifications of this size include:

    • Diameter: 600mm
    • Length: 2,400mm – 2,700mm
    • Current-carrying capacity: Approximately 60,000 to 90,000 amperes, depending on the length and operational environment
    • Apparent density: Typically around 1.70 to 1.74 g/cm³, ensuring optimal conductivity and mechanical strength
    • Resistance: Low electrical resistance, which ensures efficient power transfer and heat generation during steel production

These specifications make the UHP graphite electrode (600mm) highly suitable for the rigorous demands of large electric arc furnaces.

RS Graphite Electrode 600 in Steel Production
Graphite Electrode 600 in Steel Production

Applications of UHP Graphite Electrodes (600mm)

The UHP graphite electrode (600mm) is primarily used in large-scale steel production, where electric arc furnaces are employed to melt scrap steel and other raw materials. Its superior electrical conductivity and heat resistance allow it to handle the extreme conditions needed for high-volume steelmaking.

Key Applications:

    1. Electric Arc Furnaces (EAFs): UHP graphite electrodes, size 600mm, are crucial in EAFs, where they help create the intense heat necessary to melt scrap steel and other raw materials. The high-power output and durability of these electrodes make them ideal for continuous operations in steel plants.
    2. Ladle Furnaces: After the initial melting process in EAFs, steel is often transferred to ladle furnaces for further refining. The UHP 600mm electrodes are used here to maintain the molten steel at high temperatures, ensuring the removal of impurities and improving steel quality.
    3. High-temperature industrial applications: Beyond steelmaking, UHP graphite electrodes are employed in other industries that require sustained high temperatures, such as silicon production and other metallurgical processes.

Advantages of UHP Graphite Electrodes (600mm)

The 600mm UHP graphite electrode offers several key advantages for industrial applications:

    • Superior conductivity: With low electrical resistance and high current-carrying capacity, these electrodes enable efficient power transmission, reducing the energy required for steel production.
    • Longer lifespan: The larger diameter and high-quality materials used in UHP electrodes ensure they can withstand the extreme conditions of steelmaking for extended periods, minimizing the need for frequent replacements.
    • Reduced operational costs: The durability and efficiency of UHP graphite electrodes (600mm) help reduce both energy consumption and maintenance costs in large-scale operations.
    • Environmental benefits: Electric arc furnaces using UHP graphite electrodes produce fewer emissions compared to traditional blast furnaces, contributing to more sustainable steelmaking practices.
Graphite Electrode 600 in RS
Graphite Electrode 600 in RS

High-Performance Steel Production – UHP Graphite Electrodes (600mm)

In the world of high-performance steel production, UHP graphite electrodes (600mm) stand out for their ability to deliver consistent, reliable, and efficient performance in demanding industrial environments. With their superior conductivity, durability, and capacity for high current, these electrodes are essential for large-scale electric arc furnaces and other high-temperature applications.

As industries continue to evolve and demand higher efficiencies, the role of precision-engineered components like UHP graphite electrodes will only grow in importance. The 600mm size offers the perfect balance between power, durability, and cost-effectiveness, making it a key asset in the quest for more efficient and sustainable steel production.

UHP Graphite Electrodes: UHP 600, UHP 300, and UHP 200

UHP Graphite Electrodes: Powering the Future of Steel Production. In the ever-evolving steel industry, efficient and high-performance materials are essential for keeping production costs low while maintaining high output quality. Ultra-High Power (UHP) graphite electrodes are a crucial element in electric arc furnace (EAF) steelmaking. These electrodes are designed to handle the intense electrical currents and high temperatures required to melt scrap steel and convert it into molten steel. Among the most commonly used are UHP 600 electrodes, along with UHP300 and UHP200 high-power graphite electrodes, which have proven to be indispensable for modern EAF operations.

This blog post will dive deep into the characteristics, applications, and advantages of these UHP graphite electrodes, focusing on the UHP 600, as well as the UHP300 and UHP200 variants, particularly the 300 mm diameter (length 1800 mm) electrodes.

uhp graphite electordes for Arc Furnaces
uhp graphite electordes for Arc Furnaces

Understanding UHP 600 Electrode: Key Characteristics and Applications

What is a UHP 600 Electrode?

The UHP 600 electrode is a high-performance graphite electrode designed for use in the most demanding applications within electric arc furnaces. The “600” refers to the electrode’s diameter in millimeters, meaning these are large, powerful electrodes capable of handling immense electrical loads. These electrodes are typically used in large-scale steel production, where their capacity to carry high electrical currents enables efficient melting of scrap steel.

Graphite electrodes in UHP grades are distinguished by their ability to conduct electricity with minimal resistance while withstanding extremely high temperatures, often exceeding 3,000°C. UHP 600 electrodes are especially popular in furnaces where high-efficiency production is critical, allowing for faster melting times and increased production capacity.

Applications in Steelmaking

UHP 600 electrodes are typically used in large electric arc furnaces (EAFs) for mass steel production. Their size and capacity allow them to handle the high current levels necessary to melt significant amounts of scrap metal. These electrodes are often found in facilities where high tonnage steel production is required daily, providing the robustness and durability needed to meet such demands.

In addition to steelmaking, UHP 600 electrodes are also used in ladle furnaces, which are employed to refine and further process molten steel. The electrodes provide the energy required to adjust the chemical composition and temperature of the molten metal, ensuring that the final product meets the desired specifications.

Rongsheng Graphite Electrodes with Nipples
Rongsheng Graphite Electrodes with Nipples

High-Power Graphite Electrodes: UHP300 and UHP200

While UHP 600 electrodes are used in large-scale operations, UHP300 and UHP200 graphite electrodes also play a vital role in steel production. These smaller electrodes are designed for medium-sized and smaller furnaces, offering high-performance capabilities in a more compact form.

UHP300 Electrode

UHP300 electrodes have a diameter of 300 mm and are often used in medium-scale EAFs. These high-power electrodes provide efficient electrical conductivity and can operate at high temperatures, making them suitable for steel production that requires precision and efficiency but on a smaller scale than what UHP 600 electrodes handle.

The UHP300 electrode’s ability to maintain stable arcs and resist high thermal loads ensures that it provides excellent performance in medium-tonnage steel production environments. It is often used in combination with other UHP electrodes, depending on the specific requirements of the production process.

UHP200 Electrode

UHP200 electrodes, with a diameter of 200 mm, are typically used in smaller EAFs or as supplementary electrodes in larger operations. Despite their smaller size, UHP200 electrodes offer high electrical conductivity and durability. They are ideal for steel plants looking to optimize their production on a smaller scale while still benefiting from the advanced properties of UHP graphite electrodes.

UHP200 electrodes can also be used for specific refining processes, where smaller electrodes are required for precise temperature control and chemical refinement of the molten steel.

The Importance of Dia 300mm (Length 1800mm) Graphite Electrodes

The size of a graphite electrode plays a significant role in determining its performance in electric arc furnaces. Graphite electrodes with a 300 mm diameter and a length of 1800 mm are widely used in medium-scale EAFs due to their balance between size, power, and cost-efficiency.

High-Power Graphite Electrodes
High-Power Graphite Electrodes

Why Dia 300mm Electrodes?

Graphite electrodes with a diameter of 300 mm offer several advantages for steelmakers:

    • Efficient Conductivity

The 300 mm diameter allows these electrodes to carry sufficient electrical current for medium-scale steel production. They ensure efficient energy transfer into the furnace, minimizing energy loss while maximizing furnace efficiency.

    • Durability and Longevity

Graphite electrodes with a diameter of 300 mm and a length of 1800 mm are designed to withstand the high temperatures and mechanical stresses present in electric arc furnaces. Their durability helps reduce electrode consumption rates, which in turn lowers operational costs by minimizing the need for frequent replacements.

    • Versatility in Applications

Dia 300mm graphite electrodes are versatile enough to be used in a range of steelmaking processes, including melting scrap steel and refining molten metal. Their size makes them suitable for medium-sized furnaces while still providing the high-power performance required for efficient production.

Advantages of Using UHP Graphite Electrodes
Advantages of Using UHP Graphite Electrodes

Advantages of Using UHP Graphite Electrodes in Steel Production

    1. High Electrical Conductivity

UHP graphite electrodes, whether UHP 600, UHP300, or UHP200, are known for their excellent electrical conductivity. This allows them to efficiently transfer electrical energy into thermal energy, ensuring that the furnace operates at optimal temperatures for melting steel. This efficiency directly translates into lower energy consumption and improved production speed.

    1. High Thermal Resistance

Graphite’s natural properties, including its high melting point, make UHP electrodes highly resistant to the intense heat generated in EAF operations. UHP electrodes can maintain their structural integrity under extreme conditions, ensuring they last longer and reduce furnace downtime caused by electrode replacements.

    1. Stability and Arc Control

UHP graphite electrodes provide stable arcs, a critical feature in steel production. Stable arcs ensure consistent furnace performance, reducing fluctuations that can lead to energy waste or variations in steel quality. This arc stability is essential for maintaining high production standards.

    1. Cost-Effectiveness

Despite their higher upfront cost compared to regular power (RP) electrodes, UHP electrodes offer long-term cost savings due to their superior durability and efficiency. Their ability to operate under high-power conditions reduces the frequency of electrode replacement, lowering maintenance costs and minimizing production downtime.

Conclusion: UHP Graphite Electrodes as a Cornerstone of Efficient Steel Production

UHP graphite electrodes, particularly UHP 600, UHP300, and UHP200, are essential components in modern steel production. Their superior electrical conductivity, thermal resistance, and durability make them ideal for electric arc furnaces of varying sizes. Whether it’s the large UHP 600 electrode for high-tonnage production or the versatile UHP300 and UHP200 electrodes for medium- and smaller-scale operations, these electrodes ensure efficient, cost-effective, and sustainable steelmaking.

For steelmakers aiming to optimize their production processes, investing in UHP graphite electrodes is a smart choice that leads to improved performance, lower costs, and higher output quality.

Influence of Splattering of Lengthwise Graphitization on UHP Graphite Electrodes

Inner string graphitization is a process in which the current directly passes through the furnace core composed of roasted products in series, and the roasted products are graphitized through the thermal effect of the current. In the process of graphitization and power transmission, the baked product is treated at a high temperature above 2400°C and finally transformed into a graphite product with better conductivity and oxidation resistance. Graphitization is an important production link in the production of ultra-high power graphite electrodes, and graphite electrode products are accompanied by a series of complex physical and chemical changes in the process. By analyzing the actual changes in products and the causes of abnormal conditions during graphitization and power transmission, it is helpful to better formulate and improve process parameters and improve the product quality of graphite electrodes.

UHP Graphite Electrodes
UHP Graphite Electrodes

The graphitization process of a graphite electrode manufacturer uses a U-shaped inner series graphitization furnace. The products are loaded on the east and west sides of the furnace, and metallurgical coke is used as the furnace bottom material and insulation material. The joints for ultra-high power graphite electrodes are loaded into the graphitization furnace in a multi-column bundling manner. During the power transmission process, the displacement data of the product is determined by the expansion and contraction of the furnace tail-pushing equipment and is recorded and monitored by the computer. Through the summary analysis of various parameters before and after spraying the furnace in the inner string graphitization process of the joints for ultra-high power graphite electrodes. The physical and chemical changes in the graphitization process, the reasons for spraying furnaces, and the impact on product quality are explained, and corresponding solutions are proposed. It is hoped that it can promote the production of domestic large-scale ultra-high-power graphite electrode nipples.

Reason Analysis of Splattering of Lengthwise Graphitization

According to the production records, the graphite electrode nipple product was sprayed at time t6. The location of spraying furnace is located at the furnace head on the east side of the U-shaped graphitization furnace, and the maximum power transmission power has been reached when the furnace is sprayed. Before spraying the furnace, the furnace resistance increased abnormally. After spraying the furnace, re-energize and the furnace resistance returns to normal.

In addition to the length of raw materials and roasted products, the pusher device at the end of the furnace is also a factor affecting the displacement of the east and west sides. The pusher at the end of the furnace usually applies pressure to make the electrode series connection closely, so as to reduce the contact resistance between the electrode end faces. According to the research of the experimenters, the pressure should be adjusted in time during the graphitization and power transmission process to maintain a stable contact resistance. In addition, during the electrode inflation stage, the change of the pushing pressure on both sides of the furnace tail will also affect the displacement of the east and west sides to a certain extent.

In the actual power transmission process, the hydraulic pressure at the end of the furnace is controlled by the same hydraulic station. However, when there is partial blockage, oil leakage, or other problems in the hydraulic pipeline on one side, the actual acting pressure on the east and west sides may be different. This may be the reason for the difference in expansion between the east and west sides of ultra-high power graphite electrode products within a certain time interval.

As the temperature continues to rise, the graphite electrode product begins to shrink in the temperature range in the next period of time, and the amount of shrinkage gradually increases. At this time, according to the process requirements, the automatic hydraulic system at the end of the furnace needs to adjust the pressure in time to adapt to the shrinkage of the electrode string. However, when the hydraulic system at the end of the furnace fails to adjust the pressure quickly due to some reasons, and because the hydraulic device is located at the end of the furnace, it is far away from the furnace head. Affected by the frictional resistance of metallurgical coke, the pressure at the furnace head is lagging or insufficient, which is particularly likely to cause an increase in the contact resistance of the electrode end surface at the furnace head. Even in severe cases, the metallurgical coke insulation material enters the gap of the electrode end face. This leads to an abnormal increase in local contact resistance, resulting in burnout. This is also the reason why the graphitization spray furnace usually occurs at the furnace head.

Influence of Splattering of Lengthwise Graphitization on UHP Graphite Electrodes

After the graphite electrode nipple products are released from the furnace, through the analysis of the processing results, the qualification rate of the graphite electrode products on the east side of the graphitization furnace is slightly lower than that on the west side. This may be related to the larger displacement on the east side during graphitization and power transmission. In this temperature range, the chemical reaction is intensified, the stress is concentrated, and the excessive displacement will easily cause cracks in the product, resulting in unqualified products.

According to the normal distribution of bulk density and resistivity of processed graphite electrode nipples, the bulk density and resistivity of the east side are slightly lower than those of the west side. This may be related to insufficient push pressure on the middle east side during graphitization and power transmission and metallurgical coke entering the gap of the electrode end face. During the power transmission process, the contact resistance between the end faces of the electrode string on the east side is relatively high. According to Joule’s law, the east side generates more heat and has a higher degree of graphitization, so the resistivity and bulk density of the product decrease.

Solutions to Splattering of Lengthwise Graphitization

1) When graphitizing power transmission, the pushing pressure of the furnace tail should be adjusted appropriately according to the product diameter and furnace loading form. In order to avoid the situation that the furnace tail pressure cannot meet the production needs due to specification changes.

2) When graphitizing the furnace, small graphite blocks can be laid under the electrode trunk to reduce the influence of metallurgical coke friction resistance on the pushing pressure. There is hysteresis or insufficient pressure to improve the position of the furnace head.

3) The furnace tail pusher is one of the key pieces of equipment to ensure the normal power transmission of the inner string graphitization furnace. The change in its pressure is closely related to product quality, and it should be maintained and corrected regularly.

4) Graphitization During the power transmission process, the change of furnace resistance can timely and effectively reflect the real-time situation of the products in the furnace. It should be paid attention to during the power transmission process. When the furnace resistance is abnormal, the process can be adjusted in time to ensure product quality;

5) The graphitization power transmission is controlled by a computer program, and the pushing pressure can be considered to be added to the program. In order to realize real-time monitoring, and set relevant thresholds or alarm conditions for changes in furnace resistance.

Rongsheng Graphite Electrodes Manufacturer

Rongsheng graphite electrode manufacturer is an experienced manufacturer of graphite electrodes. Our graphite electrode customers continue to return orders from our manufacturers. Moreover, we support the customization of graphite electrode products and can provide you with customized graphite electrode products according to your specific usage requirements. Contact us to buy high-quality ultra-high power graphite electrode products.