Steelmaking has never been one single process. In fact, there are different routes, different raw materials, and different outcomes. The electric arc furnace (EAF) route is now one of the most important methods of producing steel in the UK and is broadly seen as the future of steelmaking, particularly as the industry looks to reduce the environmental impact of production.
In the simplest terms, electric arc furnace steel production sees steel scrap melted using electricity instead of coal to produce new steel products. But in practice, the process is far more controlled, technical and precise than that short explanation makes it sound – so let’s explore it further.
Electric arc furnace steelmaking: the basics
The electric arc furnace steelmaking process is based primarily on recycling scrap steel by melting it and refining it into new steel products. Instead of starting with iron ore as blast furnace production would, the EAF starts with steel products that have reached the end of their current service life – such as steel from buildings that have been demolished, cars that have been scrapped, or even old machinery that’s no longer fit for purpose.
Steel is one of the few materials that can be recycled repeatedly without losing its properties, meaning quality remains consistent time and time again. That means steel can stay in the value chain continuously – and that is what makes the electric arc furnace steelmaking route so important.
But scrap steel cannot just be thrown into a furnace and melted. The process starts long before the furnace is even switched on to ensure high levels of quality and consistency.
Step 1: Scrap selection and preparation
The first stage of the electric arc furnace steelmaking process is scrap selection.
Different types of scrap contain different chemical compositions. Some have higher carbon content, some contain alloys, some are cleaner than others. Steelmakers carefully select and blend scrap to achieve the chemistry required for the final steel product.
Large pieces are cut down. Contamination is removed. Scrap is sorted and stored in grades. Then it is loaded into large charge buckets ready for the furnace.
If the scrap mix is wrong at this stage, it becomes much harder to correct the chemistry later. So this part of the process is more important than most people realise.
At 7 Steel, we retain complete control over this element of our process through the Recycling arm of our business. With a nationwide scrap network established, we source and process steel scrap in-house to ensure we have a continuous supply of high-quality feedstock for our electric arc furnace.
Step 2: Charging the furnace
Once the scrap mix is ready, it is charged within the electric arc furnace. This is a major step within the production process, taking steel scrap and melting it so new steel products can be made.
As the roof of the electric arc furnace opens, a large bucket is moved into position and drops the pre-sorted scrap directly into the furnace shell, before the roof closes again. Each batch is known as a heat, and it’s this process that provides EAF production with its flexibility – increasing and decreasing to reflect market demand. A furnace might run many heats per day depending on production demand and the steel grades being produced.
Once everything is in place, graphite electrodes are then lowered into position above the scrap, and it’s at this stage that the process really picks up pace as the power is turned on.
Step 3: Melting the steel
Within the furnace, electricity passes through the graphite electrodes and creates an electric arc between the electrode and the scrap metal. This arc generates extremely high temperatures, well above the melting point of steel (typically between 1,370°C and 1,540°C) to accelerate the process.
The scrap begins to collapse and melt, forming a pool of molten steel at the bottom of the furnace.
During melting, oxygen is often injected into the furnace which helps to speed up the melting process and improve energy efficiency. Burners may also be used to support the melt, particularly at the start when the scrap is still solid.
Of course, melting is not just about heat. Operators are constantly adjusting power input, electrode position and oxygen flow to keep the process stable and efficient.
Step 4: Refining the molten steel
Once all the scrap has melted, the process moves into the refining stage.
Fluxes such as lime are added to the molten steel and it is these materials that form a layer of slag that floats on top of the steel. The slag removes impurities such as sulphur and phosphorus and helps clean the steel, making it a natural – and critical – part of the steelmaking process.
Samples are taken from the molten steel and tested. If the chemistry is not correct, alloys or carbon are added to adjust it. Temperature is also checked regularly, because steel must be tapped at the correct temperature for casting to ensure quality.
This stage is less visible than the melting stage, but it is where steel quality is tightly controlled to ensure the final product is up to scratch.
Step 5: Tapping the steel
When the correct chemistry and temperature is achieved, the furnace is tilted and the molten steel is poured into a ladle – a process that is called tapping.
Additional alloying elements are often added during tapping to fine-tune the final steel grade. The ladle then moves where final adjustments can be made before casting.
Timing matters here, making this stage of the process swift – an essential characteristic of steelmaking where everything comes down to timing and temperature.
Step 6: Continuous casting
After refining, the molten steel is cast into solid forms such as billets – and it’s at this point that the recycled steel turns into a new, usable product.
In continuous casting, molten steel is poured into a water-cooled mould where the outside solidifies first. The steel continues to cool as it moves through the casting machine until it becomes fully solid.
These billets are then cut to length and sent to the rolling mill, where they are rolled into finished steel products such as reinforcement bar or wire rod.
Electric arc furnace steel and recycled steel
One of the biggest advantages of the electric arc furnace process is that it uses recycled steel as its main raw material.
The UK produces millions of tonnes of steel scrap every year. Historically, a large proportion of that scrap has been exported overseas. Electric arc furnace steelmaking allows that material to be recycled domestically and turned into new steel products for UK construction and infrastructure, reducing reliance on imported raw materials.
Electric arc furnace steel quality
There is still a perception that recycled steel produced through electric arc furnace techniques is lower quality than steel made from iron ore. However, that thinking is outdated, with the industry seeing EAF production as the future of steelmaking in the UK.
Modern electric arc furnace steelmaking allows very tight control over steel chemistry, temperature and refining and the final steel products can meet the same structural and engineering standards required for major infrastructure and construction projects. And, while quality is consistent, one thing that’s very different is the environmental impact of production, with EAF routes representing a cleaner, more sustainable method.
The quality of steel depends on process control, raw material selection and refining, not simply on whether it came from a blast furnace or an electric arc furnace.
Why the electric arc furnace process matters
The electric arc furnace steelmaking process is not new technology, but it is becoming increasingly important in the UK steel industry.
It allows steel to be made from recycled material, creates a more resilient domestic supply chain, reduces reliance on imported raw materials and aligns with the long-term direction of steel production.
In simple terms, scrap steel is turned back into new steel, again and again. Same material. New life. Different project.