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Reheating Furnaces In Steel Rolling Mills

 

Reheating Furnaces serve the purpose of heating steel blooms, billets or slabs in steel rolling mills. Reheating furnaces takes this steel stock up to approximately 1200 degree Celsius. The steel begins to deform at this temperature, and the steel rolling process can begin. In a reheating furnace, the heat provided to the steel stock is constant. The stock is charged at the entrance, heated up to the assigned temperature in the furnace and discharged at the reheating furnace exit. During the process, the heat gets transferred to the stock in the furnace with the help of radiation and convection. This takes place due to the placement of the burner gasses and furnace walls. 

How Does The Heat Transfer Mechanism Operate In A Reheat Furnace? 

A steel stock charging temperature can vary drastically, ranging from ambient to the high temperature of 1200-degree celsius. Depending on the dimensions of the steel stock, speed of rolling, and overall steel composition, the exit temperature of a steel stock might differ. The factor of steel quality also plays a huge role when it comes to temperature as it puts limitations on the surface and gradient temperature. It is to be noted that both gaseous and liquid fuels are used in these reheating furnaces. 

What Are The Main Characteristics Of A Reheating Furnace?

A Reheating furnace’ size depends on its ability to produce hot steel from the cold steel stock and is calculated in tons per hour. The increased heat content determines a reheating furnace and its energy efficiency. When the steel stock is heated from 10 degrees celsius to approximately 1200-degree celsius and is then divided by fuel energy used, efficiency can then be calculated accurately. The energy efficiency of a furnace also relies upon the design aspects of various reheating furnaces. 

Design Features That Plays A Role In The Energy Efficiency Of A Reheating Furnace

  • Different styles of burners
  • Dimensions of a Reheating Furnace. 
  • The total number of furnace zones 
  • Different kinds of roof and wall insulation
  • Design of skid 
  • Combustion air and preheating fuel in recuperators

An energy-efficient reheating furnace is developed in a particular method to allow the steel stock to heat up at a uniform temperature without consuming too much labour and fuel. 

Here are Some of The Important Parameters That A reheating furnace must include:

  • The amount of heat that must be imparted to the charge
  • Creation of necessary heat inside the reheating furnace required to heat the stock and curb steel losses
  • The transfer of heat created onto the surface of the stock that needs to be heated
  • Temperature equalisation within the stock 
  • A decrease in heat losses from the reheating furnace to a minimum 

Several operational approaches also play a crucial role in the energy efficiency of a reheating furnace. The ideal case of a reheating furnace is when the furnace is operated at the rated capacity with one kind of steel stock, which has the same dimension and composition. But often, this practice is not followed, which hampers the efficiency of the reheating furnace. 

Factors that Affect Efficiency of A Reheating Furnace

  • Differences in the dimension and composition of steel stock 
  • Delays in rolling can delay or halt the movement of steel stock in the furnace 
  • The composition of the fuel and its availability may differ
  • The conditions of the burners and the internal  state of the reheating furnace might deteriorate 

How are Reheating Furnaces Classified?

Several types of reheating furnaces are available in an average steel rolling mill, but how are they classified into different categories? Reheating furnaces are usually placed in four categories based on:

  • Heating Method 
  • Charging the reheating furnace method 
  • Steel stock movement inside the reheating furnace
  • Recovery of the heat method

If the reheating furnace is classified based on the heating method, there will be two types of heating.

  • Electrical Heating 
  • Combustion Heating 

Combustion heating reheating furnaces are able to use solid, gaseous and liquid fuels.

When the classification is based upon the steel stock’s movement in the furnace, a continuous furnace can be categorized further.

  • Pusher Furnace 
  • Walking Beam Furnace 
  • Roller Hearth Furnace 
  • Walking Hearth Furnace 
  • Rotary Hearth Furnace 

When the classification depends on heat recovery, there are only two types of reheating furnaces.

  • Regenerative Type 
  • Recuperative Type

The regenerative type of reheating furnace operates on regenerative burners. On the other hand, the recuperative variety of reheating furnaces functions with recuperators. 

Why Choose Reheating Furnaces From The Best Rolling Mill Manufacturers

When you select reheating furnaces from The Steefo group, you are guaranteed superior quality. Get your hands on the most innovative and futuristic products that will help you change the face of your business.  

Our projects and products also experience strict testing and quality checks to deliver best-in-class products. Our emphasis on technology and innovation also delivers up-to-date products for your rolling mill. 

To learn more about the Steefo Group and our reheating furnace and how they can improve your productivity and profits, contact +91 98240 76873 or drop a mail at marketing@thesteefogroup.com

 

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Why Should You Pick Turnkey Projects From The Steefo Group?

 

Purchasing a turnkey rolling mill project is always beneficial and effective.  Are you wondering why turnkey solutions are so important? With turnkey solutions, the client saves substantial time and monetary resources, which would otherwise have been used on erecting rolling mills. If you are considering buying steel rolling mills or related products, it is worth looking for the turnkey solutions that the Steefo Group offers.

The Steefo Group is infamous for establishing its presence in the steel rolling industry as one of the most reliable partners in the world of steel rolling and forming. Our projects are executed in unimaginable time frames, including turnkey solutions. Our quality is undisputed, with cutting-edge technology and machinery, professional engineers, and the best manufacturing facilities in India.

Steefo delivers unparalleled technological responsibility helping clients during the entire project term. We create numerous turnkey solutions, which include providing the steel plant equipment and conducting the project. It also includes the erection and commissioning projects to acquire necessary and optimum production capacity.

Greenfield / Brownfield integrated

The Steefo Group provides completely integrated steel rolling plant machinery and equipment. It contains Turnkey solutions and supplies, auxiliary plants, and procedure control automation. There is also a full-service range involving exceptional methodology and emphasis on optimum responsibility for the advancement of our clients.

TMT Bar Rolling Mill

For The Steefo Group, TMT bar rolling mills have become part of our DNA. We have always been the one-stop shop in the steel melting and rolling industry for all your needs. Our advanced and modern design can handle turnkey solutions right from the inception or concept to the completion or commissioning of the project. These projects can be customised according to the client’s requirements, ranging from a production capacity of 10 TPH TO 100 TPH.

The Steefo Group has always uncovered ingenious, integrated automation solutions devised to increase productivity and reduce the workforce, guaranteeing a quicker return on investment.

Structural Rolling Mill

The rolling and roll formation occurs through a rolling mill to curve or distort the workpiece to the preferred shape while retaining a consistent cross-section.

The Steefo Group is amongst the expert front runners who have completed and supplied end-to-end turnkey solutions and services for structural rolling mills. Our structural rolling mill unfailingly provides improved performance and minimal downtimes.

Wire Rod Mill

The Steefo Group has been a reliable name in innovative design, expert engineering, consultancy, and development of Wire rod mills. We have developed, planned, supplied, and commissioned several wire rod mills varying from medium to large capacities for approximately four decades.

The increasing demands on the production quality of the wire rods and the flexibility and cost-effectiveness of the wire rod mills have facilitated the evolution of contemporary and creative technologies and processes. Our modern wire rod mills are high-speed mills capable of rolling smaller sizes. They also have increased production rates while maintaining investments and operating costs at reasonable levels.

Customised Solutions

The evolution and execution of turnkey plants are conducted precisely in line with your necessities at your desired quality.

Our latest creative processes satisfy the necessities of today’s demanding steel industry in terms of increased product quality and output capability, more profitable material yield, and plant efficiency, resulting in significant savings.

Why Choose The Steefo Group?

You get guaranteed quality when you choose turnkey solutions from The Steefo group. You also get your hands on the most innovative and futuristic products that will help you transform the face of your business. The Steefo Group specializes in everything,  from turnkey projects to single modular projects, depending on the needs of your business. From TMT bar rolling and wire rod mills to products such as mill stands, rolling mill gearboxes, and reheating furnaces

Our projects and products also undergo rigorous testing and quality checks to supply the best-in-class products. Our focus on technology and innovation also provides you with the most up-to-date products for your rolling mill. 

To learn more about the Steefo Group and their products and how they can improve your productivity and profits, contact +91 98240 76873 or drop a mail at marketing@thesteefogroup.com

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How Are The Products of The Steefo Group Changing The Rolling Mill Industry

 

To manage the fast-paced nature of steel rolling mills, you need superior quality products that can support your production line. If you are looking for such premium quality, the only name that one should rely on is The Steefo Group. Our futuristic and innovative modular products can transform and aid all your growing business needs. This will allow you to obtain more clients due to your new and improved business performance. Steefo Industries also provides high-quality products that pass through several quality assurance checkpoints to ensure seamless performance. Our products and manufacturing process goes through constant up-gradation and improvement to guarantee that our clients only receive the best of the best.

Now, let us give you a glimpse at our vast product line.

Reheating Furnaces

Reheating Furnaces are essential for hot rolling mills. They help in converting the Billets into rolling temperatures and making them suitable for deformation and further use. The Steefo Group’s reheating furnaces stand apart from the rest because it ensures several benefits that are necessary for improved performance, such as

  • Consistent Thermal Level and Thermal Homogeneity
  • Mark Elimination
  • Combustion Automation
  • High-Quality Refractory Material Installation

Rolling Mill Gearbox

As the number one rolling mill manufacturers in India, we also create rolling mill gearboxes. A gearbox is a housing that contains numerous open gear sets. The housing comprises shafts and bearings and contains lubricants, and protects the component from other conditions. The job of the gearbox is to increase or decrease the speed and torque of the drive unit depending on the requirement. Our gearboxes are available in several load capacities and have multiple speed ratios. The Steefo Group ensures that our rolling mill gearboxes have the best-

  • Dimensional Accuracy
  • Reliability
  • Optimum Performance

Mill Stands

Mill Stands are an essential part of rolling mills. They can do quick roll change and complete automation to create numerous products, namely, wire rods, universals, channels, beams and more. The Mill Stand produced by the Steefo Group has several purposes, such as the hot rolling of wire rods, TMT bars, strip mill and much more. To work with the demand of our clients, we ensure that our mill stands can be upgraded and customized. Fibre Bearing and Anti Friction Roller bearing upgrades in our conventional stands are some.

Shears

The Steefo Group has the expertise in creating some of the best shears among all rolling mill manufacturers. The Shearing machine is an integral part of the entire hot rolling process. These are installed to cut the tail end and the length. This step is taken to fit the cooling bed and the commercial length of the TMT bars. Our shears have the Steefo guarantee of being of superior build and performance-driven.

Pinch Rollers

A Pinch Roller created by the Steefo Group is essential when working with hot rolling and strip steel mills. Pinch Rollers operate horizontal cantilever structures that require an air cylinder and double roll device, which allows the up and down synchronous roll clamp. A pinch roller aids in removing coil rejection because of poor surface quality. In general, pinch rollers are designed to provide superior performance and can meet the expectation and needs of the hot steel strip coiling application.

Loopers

If searching for the best loopers, you should rely on the ones produced by the best rolling mill manufacturers in India. Our Loopers are required at the finishing mill area for a tension-free rolling process and to ensure accurate section tolerance is achieved. To improve production capacity by reducing miss rolls, installing loopers is critical. Looper also can be installed in the inter-stand position to decrease the tension variation by a simple angle adjustment, improving bar threading and product quality.

Quenching System

The Quenching System supplied by the Steefo Group is trusted by rolling mills in India and worldwide. A quenching system, also known as the TMT box, is installed after the final finishing stands on the mill train to provide the rebars with the thermal treatment necessary to create the product. The Quenching system provided by us also cleanses the surface via scrubbing. These are some of the characteristics our superior quality quenching system offers:

  • Consistent ring formation
  • Uniform tensile strength along the length of the bar
  • Motorized valves
  • Corrosion-free
  • Time-efficient
  • High-quality design
  • Powerful construction
  • Closed frame to adapt the forces in the sizing press
  • It can be operated under extreme conditions

Automatic Cooling Beds

Our Automatic Cooling Beds are necessary to cool down TMT bars by using uniform air cooling and are also used to transport it in a phased manner to the discharged side. These beds also provide alignment when they are transferred onto the roller table to the finishing section.

Packing Beds – Tying & Bundling

The Steefo Group creates superior quality and advanced packing beds for steel rolling manufacturing. Packing beds are necessary for tying and bundling rebars. These packing beds are critical, enhance productivity, and improve plant function.

Roller Table – Conveyor

We manufacture some of the most efficient range of Roller conveyors or roller tables necessary for rolling mills. These roller tables transfer a billet to the charge furnace, then transfer it from the furnace to the roughing mill and cooling bed. It is then used to shift the product to the shearing machine, which is cut depending on the desired length.

Why Choose Products From The Best Rolling Mill Manufacturers

When you select products from The Steefo group, you are getting guaranteed quality. You also get your hands on the most innovative and futuristic products that will help you transform the face of your business.

Our projects and products also undergo rigorous testing and quality checks to supply the best-in-class products. Our priority on technology and innovation also provides you with the most up-to-date products for your rolling mill.

To learn more about the Steefo Group and their products and how they can improve your productivity and profits, contact +91 98240 76873 or drop a mail at marketing@thesteefogroup.com.

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How Is The Steefo Group Leading the Way In Steel Rolling Mill Manufacturing

 

When you talk about the best steel rolling mill manufacturer, what is the one name that comes to your mind? The Steefo Group, right? The Steefo Group is acknowledged as one of the most established companies leading the way in steel rolling mill manufacturing since 1976. Steefo Industries has built its credibility and reputation through its superior quality and design and has even been recognised by the government of India as the Star Export House. Our company has earned that title with over 100+ establishments worldwide, turning itself into a domestic and international name. 

In the world of steel rolling mills, Steefo Industries redefines the term quality and calibre because of its ability to execute any project. Including some of the most mind-blowing turnkey projects at record time while maintaining that Steefo quality. 

Well, the reason behind The Steefo Industies’ astronomical success is because of multiple factors. But at our core, our highly trained engineers, advanced machinery and cutting-edge manufacturing facilities create an unshakable foundation. 

How is The Steefo Group Different?

Let us discuss what allows The Steefo Industries to stand apart from the crowd and brand itself as your reliable steel forming partner. 

Quality

Steefo Industries has earned a worldwide reputation for its superior quality. The focus on quality is given the highest priority, and the team takes extra effort to ensure that. To us, our premium quality is the highest value addition to our products. The products are created to meet even the most stringent norms and standards globally. The standard is maintained throughout the manufacturing process, from the concept to commissioning. 

To guarantee that the customer has the highest quality products, the quality assurance team performs regular quality checks and testing at every stage of the manufacturing process. The raw materials are thoroughly examined and undergo metallurgical and other quality tests. 

Research and Development

Steefo Industries takes innovation to the next level. Everyone in the team believes there is always space for improvement and innovation. The research and development team focuses on developing R&D and design capabilities and technical development. Steefo Industries is one of the few manufacturers utilising the most advanced technology to satisfy customers’ demands. 

Innovation

Change is an opportunity. We use that opportunity to innovate and create. Steefo Industries understands that and boosts any chance to innovate. To the company, innovation is more than simply developing new products and technology. The aim is to allow design engineers to use their knowledge and rationale to dig deep and resolve issues that seem uncertain. 

Our team learns how to adapt to new changes in the process, management, business systems, and more to ensure customer satisfaction and growth. 

When you partner with The Steefo Industries, you invest in not only superior grade products but also invest in our workforce that delivers the best results.  

What Are We Known For? 

Turnkey Solutions 

Steefo Industries is known worldwide for the turnkey solution that we provide. The team offers technological responsibility aiding customers during the total project life cycle from concept to commissioning. This includes rolling mills as well as integrated steel plants. 

Steefo Industries provides the required plant equipment and guarantees execution.

The Steefo Group provides turnkey solutions in the areas mentioned below: 

  • Greenfield / Brownfield integrated mini steel plant
  • TMT bar rolling mill
  • Structural rolling mill
  • Wire rod mill
  • Customised solutions

Products 

Steefo Industries also excels in single modular products required to grow your business and allow customers to improve their business performance and productivity. To operate a steel plant, you need various products for efficient functioning as a whole unit. The products provided by Steefo Industries are not only of superior quality but also pass through several quality checks and global standards. These are just some of the products provided by Steefo Industries:

  • Reheating Furnaces 
  • Rolling Mill Gearbox
  • Mill Stands 
  • Shears
  • Pinch Rollers
  • Loopers
  • Quenching System 
  • Automatic Cooling Beds 
  • Packing Beds
  • Roller Tables 

And more 

Why Choose The Steefo Group?

Why choose Steefo Industries? The question should rather be, why not?

The Steefo Group has reached this level of success due to its relentless drive toward excellence and an uncompromising attitude towards quality. We are continuously growing and endeavouring to improve our current products and solutions; therefore, we have transformed into the leading innovation in the world of rolling mills. 

You get high-quality products and constant support from our team of professionals when you work with us. Join the world of success. To learn more, call us at +91 98240 76873 or drop us a mail at marketing@thesteefogroup.com

                                                                                                                                                                                                 

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How Does An Efficient Rolling Mill System Saves Energy and Increases Productivity?

 

The steel industry often earns itself a reputation for being energy-intensive. But with recent developments, there has been an opportunity to transform and walk toward the path of energy efficiency. 

In rolling mills, during the production process, intermediate steel products obtain their shape and dimension because of an array of shaping and finishing techniques. To get their shape, slabs are heated to an extreme temperature in the reheating furnace and are then rolled into shape with hot or cold rolling or in finishing mills. Some products specifically require hot rolling, such as reinforcement bars, steel plates, etc. Some products like steel for cars and white goods require both hot and cold rolling. 

But the energy needs and costs for both hot and cold rolling can be significantly high. Due to the cold rolling process, the mechanical forces create much more force and increase the energy needed. In the hot rolling process, the execution is faster as it consumes less force, but substantial energy costs are incurred to heat the metal to near eutectic temperatures. Data accumulated from large integrated plants show that the hot strip rolling process is the third-largest energy user apart from iron and steel making. 

Reheating Furnaces

Reheating furnaces is critical in determining end-product cost and quality in any hot rolling operation. The energy use in a reheating furnace is determined by several production factors such as stock, steel type, etc., and operational factors such as scheduling and design features. 

Globally, the total primary energy requirement for hot rolling was reported at 2 – 2.4 GJ/t, and global average energy needs in cold rolling are between 1 – 1.4 GJ/t. (IEA 2007). The way to harvest energy savings could be via upgrading existing furnaces.

Rolling Mills Technology And Measures To Be Energy Efficient  

1. Process Control in Hot Strip Mill

To improve indirect energy savings through reduced oxygen rejects, we require improved hot strip mill process control. The main objective is to control and monitor oxygen levels to optimise the combustion rate in the furnace. It also enhances productivity and reduces downtime. We can see results from a system installed at a mill in Belgium, which reduced rejects from 1.5% to 0.2%and decreased downtime from more than 50% of the time to 6%. It also leads to a reduction in CO2 emissions by 15.1kg of CO2/t-rolled steel.

2. Oxygen Level Control and VSDs on Combustion Fans

To optimise combustion in the furnace, controlling oxygen levels and using Variable Speed Drives (VSDs) on combustion air fans on the reheating furnace helps significantly. There is a substantial drop in combustion efficiency with excessive air as it leads to unnecessary waste gases. The fuel to air ratio, therefore, should be monitored regularly. The usage of VSDs on combustion air fans also helps keep the oxygen levels on the reheating furnace under check. 

This process has the potential to reduce emissions by 16.6kg CO2/t-rolled steel. It also calculates energy savings to be around 10% or 0.33 GJ/t-rolled steel by a conservative estimate.

3. Pressure Control for Furnace

There are multiple apertures that heating furnaces have, such as extraction ports, raw material charging ports, cracks in the furnace ceiling, and sidewalls. There can be unnecessary heat losses if the pressure in the furnace is too high, causing the heat to be forced out of the furnace.

Due to this, if the internal pressure drops, cold air will be sucked into the furnace, spiking up the fuel consumption. The furnace pressure control technology’s objective is to maintain a constant optimum pressure level to minimise energy consumption.  It is primarily applicable in cases of industrial furnaces, including rolling mill reheating furnaces. 

4. Regenerative Burners for Reheating Furnace

A regenerative burner is a heat recovery system that recovers the furnace exhaust gas’s waste heat to heat the furnace’s combustion air. Heat reservoirs and dual heat-recovering generators of the regenerative burner are utilised. One side of a burner combusts fuel during combustion while the other accumulates the exhaust heat into the heat-recovering generator. 

The burners then switch so that the one collecting the heat combusts the fuel while the other gathers exhaust heat. The usage of regenerative burners for reheating furnaces can deliver significant energy savings. According to NEDO, using regenerative burners on a 110 t/h capacity billet reheating furnace (operating at 1050 oC) can reduce the energy consumption by 0.18 to 0.21 GJ/t-steel in comparison to a conventional furnace.  Annual energy savings are reported to be 9.3 to 11.6 GWh. There is a scope of up to 50% NOx reduction in high-temperature combustion.  CO2 emissions will also be reduced according to the reduced fuel consumption. 

5. Walking Beam Furnace

If you are looking for state-of-the-art efficient reheating furnaces, you will have to look towards a walking beam furnace. In a walking beam furnace, the stock is located on the stationary ridges. The revolving beams walk the product through the furnace till it reaches the exit, where the beam returns to the entrance.

Compared to the three-pusher-styled furnace, installing a walking beam furnace and an efficient control system reduced energy and fuel consumption by 25% and 37.5%. It also provides lower operational costs compared to alternative transmission systems.

Bottom Line

Energy efficiency is a goal that many industries, including the steel industry. Investing into methods reduces exorbitant energy consumption and saves you from facing cost overruns due to lack of optimization. This step toward energy efficiency is also a step toward a better and greener future as many methods cut down on CO2 emissions and improve productivity.