Steelmaking has changed a lot over the centuries, but few technologies have reshaped the industry quite like the electric arc furnace. At 7 Steel UK, it sits at the very heart of how we make steel today and why we believe steel production in the UK can be both resilient and responsible.
An electric arc furnace (often shortened to EAF) is a method of producing steel using electricity rather than coal. Instead of starting with iron ore, an electric arc furnace melts recycled steel scrap, turning material that’s already been used once into new, high-quality steel products ready for the next generation of buildings and infrastructure.
It’s a fundamentally different approach to traditional blast furnace steelmaking, and one that aligns closely with our commitment to circularity, domestic supply chains and lower-carbon steel production here in the UK.
Electric arc furnace vs blast furnace: what’s the difference
The difference between a blast furnace and an electric arc furnace goes far beyond the technology itself. It affects emissions, supply chains, costs and long-term sustainability.
A blast furnace uses iron ore, coke (derived from coal) and limestone to produce molten iron, which is then converted into steel. This process is energy-intensive, requires vast infrastructure and generates significant CO₂ emissions as a result of burning carbon-rich fule derived from coal (coke).
By contrast, an electric arc furnace uses electricity as its primary energy source and recycled steel as its main raw material. That removes the need for coal entirely and dramatically reduces carbon emissions.
From an emissions perspective, the contrast is stark. While blast furnace steelmaking can emit over two tonnes of CO₂ per tonne of steel, electric arc furnace steel production can be less than half of that and even lower when powered by an increasingly decarbonised electricity grid.
For us, the electric arc furnace vs blast furnace debate isn’t theoretical. It’s why we’ve committed fully to EAF technology in Cardiff and moved away from blast furnace steelmaking altogether.
How does an electric arc furnace work?
At its simplest, an electric arc furnace works by creating an intense electric arc between graphite electrodes and the steel scrap inside the furnace. That arc generates extremely high temperatures. These temperatures often are in excess of 1,600°C, which is more than enough to melt steel.
The process begins with carefully prepared scrap being charged into the furnace. At 7 Steel UK, that scrap is sourced from across the UK, carefully sorted and processed to ensure a clean, consistent material for steelmaking. Once the furnace roof is closed, large graphite electrodes are lowered down towards the scrap and an electric current is passed through them.
As the arc forms, the scrap begins to melt, collapsing into a molten pool of steel at the base of the furnace. Oxygen, carbon and lime are introduced at different stages to remove impurities and fine-tune the chemistry, ensuring the steel meets precise performance requirements.
Once the steel is ready, the furnace is tilted and the molten steel is tapped into a ladle, ready for casting into billets before being milled into reinforcement steel. From charge to tap, the entire electric arc furnace steelmaking process can take less than an hour. This is a far cry from the days-long cycles associated with blast furnace routes.
Why electric arc furnaces matter for steelmaking today
Electric arc furnaces have become central to modern steel production because they offer something the industry urgently needs – flexibility.
An electric arc furnace for steel making can operate using a wide range of charge mixes, from 100% scrap steel through to blends that include direct reduced iron where needed. That flexibility makes EAFs well-suited to regions like the UK, where scrap steel is plentiful, and recycling infrastructure is well established.
They also allow steelmakers to respond quickly to changes in demand. Starting up or shutting down an electric arc furnace is far simpler than managing a blast furnace, which must operate continuously. This makes EAF steel production more resilient in the face of market volatility.
Electric arc furnace steel quality
One common misconception is that recycled steel somehow means lower quality steel. In reality, electric arc furnace steel quality can match and often exceed that produced via traditional routes.
Because the chemistry of the melt is carefully controlled, electric arc furnace steelmaking is capable of producing everything from standard reinforcement grades through to more specialised steels. At 7 Steel UK, our EAF-produced steel meets demanding UK and international standards, giving designers and contractors confidence in performance, consistency and compliance.
Modern secondary refining techniques mean impurities are removed with great precision, and every heat of steel is tested and monitored. The result is steel that performs exactly as required, regardless of whether it began life as an old car, demolished building or redundant infrastructure.
Electric arc furnace efficiency and energy use
Electric arc furnace efficiency has improved dramatically over recent decades. Advances in furnace design, electrode control and energy recovery mean far more of the power going into the furnace ends up melting steel rather than being lost as waste heat.
While electric arc furnace power consumption is still significant, the ability to combine electrical energy with chemical energy through oxygen and carbon injection improves overall efficiency. Scrap preheating and foaming slag practices further reduce energy demand and protect furnace linings, extending equipment life.
Compared to the scale and permanence of blast furnace operations, EAFs also come with lower capital costs and a smaller physical footprint. That makes them better suited to modern, adaptable steel production in the UK.
Electric arc furnace steel production and sustainability
Sustainability is no longer optional in construction, and electric arc furnace steelmaking is a key part of meeting that challenge.
By recycling steel rather than producing it from virgin iron ore, EAF steel production significantly reduces resource depletion and waste. Steel’s ability to be recycled again and again without loss of quality makes the electric arc furnace a cornerstone of a circular economy.
For specifiers and contractors, this translates into lower embodied carbon, improved environmental reporting and greater confidence in material provenance. Our EAF-produced reinforcing steel carries an emissions intensity far below many imported alternatives, supporting compliance with increasingly stringent project requirements.
Why electric arc furnaces are the future
At 7 Steel UK, electric arc furnaces are at the heart of a circular approach to steelmaking. Rather than following a one-way journey from raw material to waste, our EAF process transforms recycled steel scrap into new, high-quality products ready to be used again and again in construction, infrastructure, and energy projects.
This closed-loop system shortens supply chains, reduces reliance on imported materials, and lowers carbon emissions, while ensuring traceability and consistent quality. By integrating EAF technology with UK-sourced scrap, we turn end-of-life steel into valuable new reinforcement, supporting both the circular economy and the country’s sustainable construction ambitions.
Electric arc furnace steelmaking isn’t just about the equipment, it’s about creating a continuous cycle of reuse, performance, and responsibility. We deliver steel that meets the needs of modern infrastructure while reducing environmental impact.