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Siderwin, targeting radically new steel production without CO2 emissions

What if in the future we produced steel by electrolysis and therefore without CO2 emissions? Electrolysis is one of the long-term options being explored by ArcelorMittal to make steel production more environmentally friendly. The Siderwin project is the enactment of this commitment, bringing together 12 European partners.

Launched in October 2017, Siderwin falls within the framework of long-term step-change projects. It seeks to develop a radically new steel production process without CO2 emissions, based on electrolysis technology. It follows an initial project launched in the early 2000s, one of whose missions was to lay the foundations for electrolytic steel production at the laboratory stage.

With Siderwin, we are changing scale: the purpose of the project is to demonstrate the feasibility of electrolysis technology by designing a large pilot unit (3x1m) that will be installed on the Maizières research campus. We will thus move from the production of a few kilos of iron metal, to some one hundred kilos.

The Siderwin process

“Siderwin brings a new dimension to the technology of production using electrolysis and takes a somewhat more industrial turn.”

Hervé Lavelaine, Research engineer at Maizières Process and coordinator of the European project.


With this technology, carbon is replaced by electricity and, if it were to come into being, it would require neither agglomeration nor coking plant. The blast furnace would be an electric plant, with oxygen being the only gas emitted. Even the formulation process would be simplified: there would be no need to treat the hot metal; the adjustment to grade with carbon addition would be performed during the melting of iron metal plates produced by electrolysis.

Electrolysis technology also has the advantage of flexibility and more specifically the ability to interrupt the iron metal production process. This is a key benefit in facilitating the incorporation of renewable (and therefore intermittent) energies into the electricity grid.

In the next two to three years, the operation of the Siderwin unit will be able to simulate its incorporation into the electricity grid.

The issues and broad outline of Siderwin technology are presented in the animation produced by the project’s European partners that is available online.

“We spent a lot of time designing and simulating. Now, we are keen to see the building erected and the new facility installed,” concludes Hervé.

Watch the video


The Siderwin pilot unit with the electrolysis cell in the centre

Siderwin in figures

  • 5-year project: 2017-2022
  • Budget of €6.8m
  • Project wholly funded by the European Union’s Horizon 2020 programme
  • ArcelorMittal is the project coordinator: Hervé Lavelaine, coordinator of the project within the consortium, and Pascal Marlier, Technician in charge of supervision of building construction and engineering
  • 12 partners from 7 different European countries are covering the entire value chain from raw materials and energy to metal production
  • The energy need to transform iron ore into liquid steel is expected to be about 30% lower with Siderwin than with a blast furnace

Key stages

  • April 2019: start of construction of the building housing the Siderwin pilot unit at Maizières
  • Q1 2020: commissioning of the Siderwin pilot unit
  • 2021/2022: remote operation of the Siderwin unit


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