The steel industry is one of the largest emitters of greenhouse gases. These emissions mainly originate from the ironmaking process, which currently still primarily uses coal as the main energy source and reducing agent in the blast furnace process. Figure 1 compares different process routes, clearly showing that the ironmaking stage is the main source of carbon dioxide emissions.

Figure 1. Carbon dioxide emissions from different production processes of hot-rolled strip steel

Traditional blast furnaces have the highest emissions because coke plays a dual role in the basic structure of a blast furnace: it provides the carbon needed for the reduction of iron ore and the energy needed for the melting of the reduced iron.

In the direct reduction zone of the blast furnace, gas passes through coke and then through the iron ore feedstock to ensure the smooth operation of the production process. This permeability is crucial for maintaining the efficiency of the reduction process. The energy required to melt and reduce the iron ore is generated in the melting zone, where the coke burns under the influence of hot blast. This combustion not only produces the necessary heat but also carbon dioxide. The high temperature inside the furnace causes the carbon dioxide to react with the carbon in the coke, generating the reducing gas CO used to reduce the iron ore. However, this process also produces a large amount of emissions. The flue gas, mainly composed of CO and CO2, is a byproduct of the reactions within the furnace.

Research into reducing blast furnace emissions is ongoing, focusing on exploring alternative reduction methods and cleaner energy sources. The primary goal is to reduce environmental impact while maintaining high production efficiency. The generation of reducing gases required for direct reduction facilities is outside the shaft furnace (the core reduction unit) and can be strictly controlled, optimizing its composition, temperature, and flow rate. This ensures high gas efficiency during reduction, preventing unused carbon from being discharged with the flue gas from the direct reduction facility. Subsequently, the solid direct reduced iron is melted in a separate smelting unit using clean electrical energy to form molten iron. By focusing on the reduction function of the carbon used, CO2 emissions throughout the iron production process can be significantly reduced. Shifting from carbon-based reducing gases to hydrogen-based gases can drastically reduce emissions. As shown in Figure 1, the availability of green hydrogen as a reducing agent is crucial for achieving an ultra-low carbon footprint in steelmaking.

Energy balance of the entire steel plant

For a process to be applicable to a new steel plant, competitive production costs are crucial, as otherwise the plant cannot be profitable. To achieve this optimally, the heat and thermal energy in the flue gas are essential to supporting the process. Decades, even centuries, of blast furnace operation have led to the development of a complex and comprehensive system designed to maximize the benefits derived from this energy.

The energy consumed to generate hot air is 1580 kJ/kg, which is required to heat the air to 1600°C. This is only a portion of the heat generated by burning the 20% to 30% CO content in the blast furnace flue gas. Typical blast furnace gas (BFG) composition is 20% to 30% CO, 20% to 30% CO2, 40% to 60% N2, and 1% to 2% H2; methane (CH4) and water vapor are typically between 2% and 7%, which are then used for other heating purposes.

Figure 2 illustrates the overall energy balance of the blast furnace and its auxiliary facilities, clearly showing that in the given example, only 3204 kJ/ton of molten iron energy is available for other processes. If needed, blast furnace gas can be enriched by adding natural gas to achieve the required combustion temperature and energy requirements before being used for other purposes. Since blast furnace gas is not the only fuel gas in long-process steel production, other gases such as coke oven gas and oxygen top-blown converter gas can be added, mixed, or used to achieve similar functions. These fuel gases can be used to operate heating equipment for other processes, such as rolling mill heating furnaces. Gases not directly consumed by other processes are ultimately burned to produce steam, which then drives steam turbines in power plants to generate electricity. This helps long-process steel plants maintain relatively low electricity consumption levels and, in some cases, even feed electricity into the grid.

Figure 2. Energy flow diagram of blast furnace and its auxiliary facilities (unit: tons of standard coal)

When a steel plant becomes a direct reduced iron production facility with independent melting furnaces, the impact of the flue gas produced is very significant.

The energy consumed is shifting from the chemical energy in coal to primarily electrical energy, which is then delivered to smelting units and other processes that cannot be heated using blast furnace gas.

In direct reduction (DR)/electric arc furnace (EAF) operations, multiple processes require electrification. Some processes, such as EAF, produce flue gas containing small amounts of heat energy. Typical components of this flue gas include: CO 60-70%, CO2 10-20%, N2 5-10%, O2 1-5%, and small amounts of other components, such as the heat energy in the flue gas from the direct reduction process. Although the total energy output of the flue gas from short-process steelmaking is several orders of magnitude less than that from long-process steelmaking plants, highly competitive EAF companies cannot ignore this energy. Due to the movement and operation of the EAF, combustion of the flue gas cannot be achieved economically. Therefore, the flue gas from the EAF requires complete post-combustion to generate heat energy at flue gas temperatures as high as 1500°C. Other waste heat sources in the direct reduction process are currently unutilized but offer potential for waste heat recovery.

The recovered energy is best in the form of steam or hot water. Installing waste heat recovery systems in all suitable locations, such as high-temperature flue gas emissions from electric furnaces, flue gas from direct reduction processes, and other sources like steel rolling furnaces, can generate a total of 510 kWh of heat energy per ton of steel. This heat energy can then be used in other processes requiring steam, such as pickling production lines.

Considering carbon neutrality plants, the production of hydrogen will significantly increase steam consumption, and when carbon capture technology is taken into account, the heat generated by amino acid-based carbon dioxide separation processes will far exceed the existing potential for flue gas heat recovery.

The configuration of steel mills will largely depend on energy availability and the corresponding energy supply for crude steel production. Therefore, traditional integrated steel mills may be split up in the future, centered around direct reduced iron (DRI) plants that provide the green energy needed for hydrogen production, supplying feedstock to smelting facilities closer to steel-consuming areas. DRI production itself can benefit from flue gas recirculation, which still contains a significant amount of carbon monoxide that can be used to reduce iron ore. To improve performance, the gas composition could be improved by separating carbon dioxide or adding natural gas. Similar approaches should apply to hydrogen-based reduction processes, where the flue gas contains water vapor as a product of the reduction reaction. This moisture needs to be separated to fully utilize the hydrogen fed into the reduction shaft through flue gas recirculation.

Balancing the priorities of energy consumers (i.e., their focus on waste heat recovery systems and their emphasis on material balance) can help accelerate the energy transition to electricity.

DRI production

Today, DR plants use a shaft furnace where iron ore particles are reduced using reducing gases; natural gas is now used in the reduction process. The MIDREX process accounts for approximately 80% of global shaft furnace direct reduced iron production. In addition to its reliability, the MIDREX process provides a pathway to decarbonization in steel production. While the natural gas-based MIDREX NG™ process already allows for up to 30% hydrogen addition, the MIDREX Flex™ process is capable of 100% hydrogen substitution, and MIDREX H2™ is designed to use hydrogen as its primary energy source, achieving up to 100% hydrogen consumption. The hydrogen consumption rate is approximately 620 cubic meters per tonne of direct reduced iron. Operating MIDREX H2 requires a reducing gas heater, which only requires electricity.

Both of these process routes—the long-flow blast furnace-converter route and the DR-based route—require lumpy feedstock to ensure sufficient gas permeability within the blast furnace or reduction shaft. Therefore, additional agglomeration steps are needed, such as sintering or granulation processes, which incur additional costs (capital expenditure CAPEX and operating expenditure OPEX) and significant CO2 emissions. To overcome these issues, Primetals Technologies is developing the HYFOR process based on fluidized bed technology, which allows the use of only green or low-carbon hydrogen as a reducing agent, avoids CO2 formation during reduction, and directly utilizes fine ore particles without prior agglomeration.

HYFOR is the only process that directly uses iron concentrate with a particle size of less than 150 micrometers without pre-agglomeration or pelletizing, which is typical for iron concentrate. Any type of iron ore (e.g., hematite, limonite, magnetite) from high to low quality can be processed in the HYFOR process. In the future, new DR processes based on low-carbon hydrogen and fluidized bed technology, such as HyREX and HYFOR, will gain a foothold in the market (Figure 3). After the iron concentrate reduction step, DRI is fed directly into an electric arc furnace or formed into lumps for transport, and subsequently used in various applications (blast furnace, converter, electric arc furnace).

Figure 3. Production area using direct reduction (DR) process in the future, aimed at optimizing the steelmaking process.

Hot direct reduced iron (HDRI) pellets can be transported to adjacent electric arc furnaces (EAFs) at temperatures up to 650°C, fully utilizing their sensible heat energy to improve production efficiency and reduce costs. Currently, all self-operated direct reduction (DR) steel mills employ hot-carrying systems to directly transport high-temperature DRI to the EAF. Three possible methods for HDRI transport are: hot-carrying insulated carts, HOTLINK, and hot-carrying conveyor belts. Primetals Technologies’ HTC system uses baskets to transport pellets to the EAF, minimizing pellet temperature loss, preventing secondary oxidation, and allowing transport distances up to 200 meters.

Crude steel production: electric arc furnace/melting furnace

The second important decision-making criterion for the future establishment of steel plants will be how iron ore will be processed. Due to the limited supply of scrap steel, especially high-quality scrap, the production of steel for high-quality applications can only be achieved using iron ore. Therefore, most metal materials will still exist in the form of iron ore. Direct reduction of iron concentrate followed by melting in an electric arc furnace requires high-quality iron ore, which is scarce. Lower-grade iron ore, which can typically be processed in a blast furnace, will require optimized production parameters, including output, energy consumption, and byproducts generated during processing, if melted in a smelting furnace.

Furnace types – Electric arc furnaces and smelting furnaces (SAF: Submerged arc furnace; OSBF: Open slag pool furnace):

The suitability of the selected furnace and the grade of the iron ore will be decisive factors. Currently, a significant portion of production uses medium-grade iron ore, which is then processed into sinter for use in blast furnaces. Due to the increasing demand for high-grade ore, new enterprises are increasingly adopting direct reduction (DR) processes. However, it is impractical to expect a large amount of high-grade iron ore to be used in DRB-T processes, given the substantial capacity shifting from blast furnaces to DRB-T. A two-step process, integrating the smelting furnace and converter, can handle such low-grade ore and is well-suited for implementation in existing integrated steel plants.

Research indicates that gangue content is the sole critical factor determining how direct reduced iron (DRI) from different types of iron ore is melted/smelted. Electric arc furnace (EAF) output decreases with increasing gangue content in the iron ore because the required basicity B2 (CaO/SiO2) of the EAF slag is 1.8–2.0 for operational reasons. The overall EAF slag volume increases significantly as the silica content in the gangue leads to increased acidic slag. The FeO content in the EAF slag is approximately 20%—overall, economic factors favor using a smelting furnace to smelt DRI from low-grade iron ore rather than an EAF. The smelting furnace uses low-basicity slag with low FeO content, thereby improving the yield of metallic iron and reducing overall operating costs, including the need for a converter (BOF) process to handle the hot iron supplied by the smelting furnace. The cost sensitivity of the two production routes at different ore grades was assessed (Figure 4). Primetals Technologies’ melting furnaces are designed to accept a wide range of metal materials, such as DRI pellets, briquette DRI, and recycled materials. The flue gas is either recovered or its thermal energy is fully utilized.

Figure 4. Process routes for smelting furnace/converter (BOF) and electric arc furnace (EAF) and production cost assessment for different iron ores.

The EAF Quantum is the latest energy-efficient electric arc furnace technology developed by Primetals Technologies. It combines mature vertical shaft furnace technology with an innovative scrap feeding process, a highly efficient preheating system, a new lower shell melting and tapping concept, and an optimized slag-free tapping system, ultimately achieving maximum production efficiency with lower energy consumption.

Since its initial launch in 2014, 16 quantum electric arc furnace (QF) projects have been successfully put into operation. These projects produce steel weighings ranging from 80 to 160 tons, while the QF furnace projects have achieved steel yields of up to 300 tons and are ready for commercial application. In the smelting metal mixtures of these plants, the use of HBI (High-Intensity Bismuth) can reach up to 30%, and the use of molten iron is 30%.

A typical electric arc furnace (EAF) produces flue gas with an energy content of approximately 150 kWh/ton, of which over 80 kWh/ton is chemical energy. To improve energy balance and thus increase the production efficiency of the EAF process, preheating scrap steel using the residual heat from the high-temperature flue gas is the most effective energy enhancement method and is of great significance in steelmaking. This is based on physical principles such as thermal radiation, gas convection, heat conduction, and heat exchange. Therefore, using a quantum electric furnace to smelt scrap steel requires less energy, thereby reducing operating costs and carbon dioxide emissions (see Figure 5). Furthermore, dust emissions are reduced by 50% compared to conventional EAF furnaces because the flue gas must pass through the scrap steel, which acts as a filter. Due to the flat molten pool operation, the nitrogen content in the molten steel is reduced, and the furnace’s impact on the power grid is significantly decreased. In addition, the quantum electric furnace requires a lower transformer capacity compared to conventional furnaces.

Flat molten pool – low flash rate: ① Scrap steel charging area, ② Flat molten pool smelting, ③ Scrap steel being poured into the vertical shaft furnace, ④ Tightly closed furnace lid, ⑤ Low-power transformer, ⑥ Preheating the scrap steel to 600℃, ⑦ Completely sealed flue gas system

Figure 5. Process overview and production data of the quantum electric furnace production line of Fujian Dingsheng Company, China, using 100% scrap steel.

Mini steel mills using electric arc furnaces require significant amounts of electricity, which can increase the strain on the local power grid. The high energy consumption of mini steel mills can impact grid stability, especially in areas with weak local grids, potentially leading to voltage fluctuations and outages if not properly managed. Primetals Technologies offers an advanced solution—the Active Power Feeder (APF)—that facilitates easier grid integration. This is particularly important when considering green electricity and integration with wind or solar power, as it allows for direct integration into the power management system. The APF also optimizes furnace operation by utilizing a Modular Multilevel Converter (MMC) to deliver actual power directly from the medium-voltage bus to the electric arc furnace in a grid-compliant manner. This achieves high power quality—low flicker, low harmonic distortion, and an excellent power factor—eliminating the need for a compensation system and compensating other electricity users on the medium-voltage bus. Dynamic process control improves the stability and efficiency of furnace operation. The furnace current, frequency, and arc voltage are automatically adjusted based on operating conditions to minimize current fluctuations, prevent overcurrent, and enhance arc stability. Fast, stepless digital control maintains the electric furnace at its optimal operating point. It reduces energizing time and energy consumption. Strict limits on overcurrent conditions reduce stress and wear on electrical and mechanical furnace equipment, thereby minimizing maintenance and electrode consumption.

High-quality steel production

The United States was the first country to combine the mini-mill concept with Thin Slab Continuous Casting and Rolling (TSCR) technology for strip steel production. Nucor achieved a major breakthrough at the end of the last century, establishing a compact production facility consisting of an electric arc furnace/TSCR, competing with and challenging existing long-process production facilities. Nucor’s innovative mini-mill initiative drove change in the steel industry, proving that smaller, more flexible mills could compete with larger, traditional steel producers. Mini-mills producing multiple steel grades were built extensively across North America, gradually adding and integrating new processes to produce higher value-added products. Great River Steel—part of U.S. Steel—was the first company to combine an electric arc furnace, RH vacuum degassing, and TSCR processes, enabling it to enter new areas such as ultra-low carbon (ULC) and silicon steel products, driven by consumer industry demand.

One of the biggest challenges in producing high-quality steel products using electric arc furnaces is the introduction of residual harmful elements—copper, nickel, chromium, and tin—from scrap steel. These residual elements undergo virtually no change during the metallurgical process and remain in the final product at the same concentration. To meet the required material properties, the permissible levels of these residual elements must be strictly limited. Table 1 describes the maximum contents of these residual elements, where the values ​​for Σ([Cu]+[Ni]+[Cr]+[Sn]) are very stringent, especially for ultra-low carbon interstitial atomless steels where residual element (IF) < 0.106 wt% and deep drawing quality (DDQ) < 0.145 wt%.

Table 1. Typical Residual Element Contents of Different Steel Grades

Columns 2 through 8 of the table represent: ultra-low carbon interstitial steel, deep-drawing steel, stamping steel, conventional commercial steel, structural steel, fine wire steel, and rebar, respectively.

Because residual elements cannot be removed by metallurgical means, extreme care must be taken when feeding them into the electric arc furnace (EAF). A common method to reduce the concentration of residual elements is to dilute them using virgin materials, most commonly direct reduced iron (DRI). The advantage of this method is that the residual element content in this DRI virgin material is close to zero. Direct reduced iron is available on the market in the form of hot-pressed iron (HBI) and can be sourced globally. For this reason, HBI is very valuable and expensive, especially when there is a shortage in the market. Therefore, it is best to locate the EAF close to the DRI production facility and optimize the hot feeding of DRI into the EAF. Such a production configuration shows optimal consumption data, and when the proportion of DRI in the feedstock reaches 100%, it is comparable to the long-process route in terms of crude steel quality. When using DRI to dilute the residual element content, its proportion should be greater than 20%. By using different proportions and qualities of DRI, the quality of crude steel can be improved.

Furthermore, utilizing high-quality scrap steel helps reduce the content of residual elements in the steel and decreases the required DRI/HBI. The quality of scrap steel can be improved by recycling in-house produced scrap steel within the steel mill, recovering manufacturing waste scrap steel from customers, or recycling end-of-life steel products. In addition, the cleaning and sorting of scrap steel becomes increasingly important.

Long-process steel mills employing the blast furnace-converter route not only achieve low residual element content but also maintain good control over sulfur (S) and nitrogen (N) content. This makes the refining process simple, efficient, and optimized over decades. Standard Operating Procedures (SOPs) focus on decarburization (DeC), deoxidation, alloying, and homogenization operations in the RH degassing unit. Although neither BOF nor EAF is suitable for desulfurization (DeS), converters can benefit from deep desulfurization in hot metal pretreatment. Therefore, in the SOPs, desulfurization in secondary metallurgy is solely for achieving extremely low sulfur content.

To achieve similar steel quality compared to the standardized process using an electric arc furnace (EAF), a secondary metallurgical step is required. To produce ultra-low carbon (ULC) steel, the steel is transferred after tapping to a ladle refining furnace (LF) to reduce sulfur content, requiring complete killing of the steel. Taking into account the temperature drop caused by vacuum degassing and the superheat of the steel in continuous casting, the steel is heated to the required temperature in the refining furnace and then subjected to vacuum treatment. Following the LF treatment, a vacuum treatment is performed in the RH (refined redox) furnace. First, nitrogen in the steel is reduced, requiring low sulfur (S) and low oxygen (O) content, as these are surface-active elements. Subsequently, carbon (C) in the steel is reduced, requiring dissolved oxygen, which is blown in through an oxygen lance. Once the desired carbon content is achieved, aluminum (Al) is added for deoxidation, and the molten steel is then sent to the continuous casting machine.

To reduce denitrification workload, quantum electric arc furnaces are highly effective because they achieve lower achievable nitrogen content during tapping compared to other types of arc furnaces. One reason for this is the flat-pool operation. Figure 6 shows a typical nitrogen distribution from the quantum arc furnace to the LF outlet under 100% scrap steel operation at Fujian Dingsheng Steel Plant. At Fujian Dingsheng Steel Plant, the final average nitrogen content after vacuum degassing-oxygen blowing (VD-OB) is very low. Comparing before and after VD-OB, the average denitrification rate is 48%.

For flat steel products, steel cleanliness is crucial. In this regard, the quantum electric arc furnace features the FAST (Five-Slag-Free Tapping System) system, enabling slag-free tapping (< 1 kg/ton), thus helping to reduce inclusions. This minimal slag runoff is also highly beneficial for desulfurization (DeS). Furthermore, due to the small furnace tilt angle required (4-6°), FAST can also perform partial tapping during energization.

Production route for high-quality steel products

A subsequent development is the further optimization of production routes by avoiding unnecessary process steps and simplifying production processes. New TSCR processes, such as Arvedi’s ESP endless strip production, are expanding into thinner dimensions that were previously unattainable by hot rolling processes. The use of endless rolling operations facilitates the production of endless rolled hot-rolled coils (eHRC), covering a significant portion of the product that could only be offered by cold rolling. Directly applying hot-rolled strip to end-consumer markets is a key concept for shortening the production chain, helping steel producers reduce energy and consumable usage, lower their carbon footprint, and ultimately reduce overall production costs (see Figure 7).

Figure 7, top right corner: Labor savings: Only one set of continuous casting operators is used, with no slab storage tasks. Other benefits: Minimal maintenance workload with a 10-meter-long induction heater, and increased work roll life due to endless rolling. Energy savings: Utilizing the internal heat of the slab, the induction heater is not used during intervals. Increased yield: The 10-meter-long induction heater produces minimal scale, eliminating the need for head and tail trimming.

In this context, to fully understand the advantages of “market substitutes,” eHRC should be compared to specific coils that have undergone pickling, oiling, and annealing cold rolling to achieve their final thickness. This material can be supplied directly to the end user or further galvanized or coated as needed for the application. Due to its unique properties, eHRC hot-rolled coils are considered premium products with their own “personality” and are often presented to customers under specific brand names (e.g., Arvtech™ manufactured by Arvedi) to emphasize their added value.

This efficiency is reflected in a remarkable figure: from continuous casting to the underground coiler after rolling, the carbon dioxide emissions per ton of electricity eHRC (Category 1 emission standard under the Greenhouse Gas Agreement) are less than 1.0 kg, while the total power consumption of 2.0 mm × 1500 mm low carbon steel in the headless rolling production mode is in the range of 120 kWh per ton (Category 2 emission standard under the Greenhouse Gas Agreement).

Digital process optimization

The primary goal of modern process optimization systems is to assist operators in achieving consistent product quality, ensuring maximum production capacity, and optimizing raw material inputs and costs. To achieve these goals, modern systems incorporate closed-loop process control functions to automate and optimize operations. For example, they comprehensively calculate the raw material inputs for electric arc furnaces based on different product requirements to minimize production costs.

Dynamic process control is a key technology for optimizing steelmaking processes. It involves the real-time, continuous monitoring and adjustment of various process variables, achieved by combining advanced control systems, sensors, and process models. These components work together to ensure the process remains within optimal parameter ranges. Sensors collect data from the steelmaking process, while advanced algorithms analyze this data and make real-time adjustments. This enables the system to automatically maintain optimal conditions and provide automated functional support to operators. As the importance of dynamic process control in modern steelmaking grows, it effectively connects real-time monitoring with process optimization. This leads to increased efficiency, reduced energy consumption and emissions, improved product quality, and contributes to a more sustainable future.

The steel production process generates a vast amount of data. Modern algorithms can effectively leverage this data to support continuous process improvement, troubleshooting, and product development. In recent years, technologies such as machine learning, neural networks, and deep learning have been applied to optimize plant operations, predict product characteristics (such as mechanical properties), and detect defects in real time. In more advanced applications, trained algorithms can even issue warnings and propose one or more countermeasures when adverse conditions may occur. The application of this so-called “prescriptive analytics” approach can significantly improve process stability and product quality.

Process optimization (TPO) is a solution based on comprehensive technical knowledge designed to improve the efficiency and quality of all facilities in a steel producer. The digital foundation of TPO is a process quality control (TPQC) system. This system acts as a data collection and analysis tool, aggregating quality-related data from multiple data sources, including varying levels of automation, sensors, detection systems, and human input. This central hub stores expert knowledge in the form of knowledge rules, which are then applied to each step of the production process. The quality execution principles of automated processes and quality assessments, AI-supported root cause analysis, corrective actions, and deviation management are illustrated in Figure 8a. Rule-based quality assessments and the selection of specific compensatory measures can consider augmented data from online forecasts and recommendations from guiding analytical tools (Figure 8b), ideally combined with domain process knowledge. Optimizing upstream key process parameters to permanently minimize potential deviations will result in better and more consistent quality, such as in mechanical properties.

in conclusion

The steel industry is a major source of greenhouse gas emissions, primarily because its long-process blast furnaces require coal for production, generating significant carbon dioxide emissions as coke is used not only to reduce iron ore but also to provide the necessary heat. Efforts to reduce these emissions focus on adopting alternative reduction methods and using cleaner energy sources, such as green hydrogen. The shift from carbon-based to hydrogen-based reducing gases can significantly reduce emissions. Furthermore, optimizing the energy balance of steel plants by utilizing flue gas for heating and power generation is crucial. Direct reduction processes like MIDREX offer a pathway to decarbonizing steel production, utilizing natural gas and hydrogen for reduction. The HYFOR process, using fluidized bed technology, can directly use iron ore powder without pre-spheroidizing, further reducing carbon dioxide emissions. These advancements aim to achieve an ultra-low carbon footprint in steelmaking.

Developed by Primetals Technologies, the Quantum Electric Arc Furnace (EAF) technology is an advanced, energy-efficient electric arc furnace technology with high production efficiency and low energy consumption. It also improves energy balance by utilizing waste heat from the furnace flue gas to preheat scrap steel, thereby reducing operating costs and CO2 emissions. An active power feed system helps manage power quality and stability, making the integration of green energy sources like wind and solar power easier. This integrated approach supports the production of high-quality steel while minimizing environmental impact and operating costs. Depending on the quality of the crude steel, the final product’s performance must be appropriately treated, and this treatment can change significantly when transitioning from converter steelmaking to EAF steelmaking.

With the development of the steel manufacturing industry, modern process optimization systems with dynamic process control capabilities have become increasingly important. By improving efficiency, reducing energy consumption and emissions, and enhancing product quality, dynamic process control plays a crucial role in achieving a more sustainable and efficient steel manufacturing industry. Data-driven process quality control solutions based on Industry 4.0 (TPQC/TPO) aim to optimize production processes and ensure product output that meets the highest quality requirements.

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