Salzgitter Flachstahl and Sunfire GmbH Partner on Hydrogen for Low-CO2 Steelmaking

By March 15, 2019 3   min read  (456 words)

March 15, 2019 |

Hydrogen for Steel Making GrlnHy

The Salzgitter Group and Sunfire GmbH are engaged with their international partners in building and operating the world’s largest High-Temperature Electrolyzer (HTE) for the energy-efficient production of hydrogen together with key technological partners.

The GrInHy2.0 project has recently been launched at the Salzgitter Flachstahl GmbH steelworks. It leads on seamlessly from the first stage of GrInHy which has already operated successfully in Salzgitter. Together with partners Sunfire GmbH, Paul Wurth S.A., Tenova SpA, French research center CEA and Salzgitter Mannesmann Forschung GmbH, the world’s most powerful High-Temperature Electrolyzer (HTE) is being constructed for the energy-efficient production of hydrogen. The GrInHy2.0 project (Green Industrial Hydrogen via steam electrolysis) has an overall budget of € 5.5 million.

GrInHy2.0 marks the first implementation of a high-temperature electrolyzer with a nominal power input of 720 kilowatt in an industrial environment. By the end of 2022 it is expected to have been in operation for at least 13,000 hours, producing a total of around 100 tonnes of high-purity (99.98 %) hydrogen. This will be used for annealing processes in the integrated steelworks as a replacement for hydrogen produced from natural gas.

Hydrogen as a reduction agent is also a central element in SALCOS (Salzgitter Low CO2 Steelmaking), the revolutionary Salzgitter Group concept for reduced-CO2 steel production, in the course of which hydrogen, ideally produced using renewable energy, is set to replace the carbon previously required to reduce iron ore to metallic iron. SALCOS is based on elements of various proven technologies, allowing the concept to be implemented swiftly at an industrial level.

By increasing the scale of the high-temperature electrolyzer, the GrInHy2.0 project will have the ability to extensively trial and test the integration of “green” hydrogen into the steelworks processes. To do so, the gaseous product of the Sunfire-HyLink electrolyzer will first be compressed and dried in the hydrogen processing unit supplied by Paul Wurth, a technology provider for the steel industry.

Salzgitter Flachstahl will be responsible for operating the plant and feeding the gas into the company’s own hydrogen network. In parallel with this, the French research center CEA will conduct multi-year trials of the electrolyzer stacks which form the central elements of HTE technology.

Tenova as worldwide partner for innovative solutions in the metals industry, will support the project through a technical and economic study to accompany the decarburization of European steel industry through the conversion at a very low CO2, green-hydrogen-based steel production.

Salzgitter Mannesmann Forschung is responsible for project coordination and management.

Although economic implementation remains questionable under current energy policy conditions, the project partners have resolved to consistently pursue the development of this significant, climate-friendly technology.

Further details are available at

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