We think ahead. Especially regarding our contribution to climate protection. Starting in 2027, we will use greentec steel to reduce our CO2missions. This will equate to 5% of Austria’s annual CO2 emissions, making greentec steel the biggest climate protection program in Austria. To achieve the goal of carbon neutrality by 2050, we are researching several new processes and investing in pilot projects that demonstrate new ways to produce steel. Below is a summary of three key projects.
The H2FUTURE hydrogen pilot plant started operation in 2019 at the Linz site. This project will test the production of green hydrogen on an industrial scale and subsequently its potential applications in the various stages of steel production and in other industrial sectors. H2FUTURE has now successfully started operating and is already producing green hydrogen.
Another research project is SuSteel, at the Donawitz site. SuSteel stands for Sustainable Steelmaking. The process is sustainable because it allows crude steel to be produced without emitting carbon dioxide. In just a single process step, a hydrogen plasma separates the iron in the ore from its attendant oxygen (reduction) and smelts it for further use—explaining why this process is called hydrogen plasma smelting reduction.
If SuSteel is developed sufficiently to become economically feasible, the International Energy Agency (IEA) calculates that this and similar technologies will make an important contribution to reducing emissions, because the byproduct of this process is not carbon dioxide but water. This research project is currently being operated in a discontinuous pilot plant with batch quantities of 20-50 kg. The project partners are K1-MET, Montanuniversität Leoben, voestalpine Stahl GmbH, and voestalpine Stahl Donawitz GmbH.
We are developing another project on the path to green steel together with the plant construction company Primetals Technologies, the metallurgical competence center K1-MET, and Fortescue Metals Group, the world’s fourth-largest iron ore supplier. At the Linz site, we plan to jointly build Hy4Smelt, a prototype plant for the emissions-free production of pig iron on an industrial scale.
HYFOR (hydrogen-based fine-ore reduction) uses 100% hydrogen to reliably reduce iron ore concentrates. The project partners Primetals Technologies, K1-MET, Montanuniversität Leoben, and voestalpine Stahl Donawitz GmbH have garnered valuable experience in this process from operating the pilot plant. Even in discontinuous operation mode, the voestalpine Donawitz site produced up to 200 kg of HBI per hour.
Hy4Smelt takes things a major step further and on an industrial scale: HBI leaves the HYFOR plant and goes directly into the smelter. This novel smelting unit produces a product similar to pig iron, which can be processed further in the traditional converter process (LD). In Linz, a demonstration plant will be built that will be able to produce up to 4 tons of pig iron per hour in a continuous process.
Hy4Smelt, the combined HYFOR and smelter plant, exploits further technological advantages for carbon-neutral steel production:
Only the much scarcer supply of high-grade ores can be used as direct reduced iron (DRI) or hot briquetted iron (HBI) which, along with scrap, is an important input material for direct use in the EAF in the classic DRI-EAF steel production route.
As an added bonus, Hy4Smelt can use the waste slag as a carbon-neutral clinker substitute, just like in the blast furnace process in the cement industry.
Starting in the mid-2030s, the International Energy Agency (IEA) proposes introducing green hydrogen “as a primary reducing agent on a commercial scale”. Its consumption in the steel industry will therefore increase significantly. However, on a global scale, the amount of hydrogen currently produced from water using the low-emission electrolysis route powered by green electricity is in the low single-digit percentage range.
“These statistics challenge us,” states Head of R&D Franz A. “We are expanding the H2FUTURE plant in Linz to include a compressor unit and suitable storage options. This will allow us to continuously supply the Hy4Smelt demonstration plant with green hydrogen from our own production, even when the renewable electricity supply fluctuates.”
Naturally, we are already ensuring that we will be able to uphold our quality promise using future steelmaking production routes. In around 150 melts from blast furnace converter technology, metallurgists have produced steel “just like that from an electric arc furnace” and analyzed more than 10,000 individual samples. This makes it possible to check material properties and material behavior during processing, even before construction of the EAF begins.
Within the framework of our focus greentec steel, we provide an overview of our concrete steps on the way towards long-term green steel production and the innovative processes we are using on this way. We provide information about the challenges we face and the breakthrough technologies we are already researching today in order to achieve our goal of steel production with net zero CO2 emissions by 2050.
Die voestalpine ist ein weltweit führender Stahl- und Technologiekonzern mit kombinierter Werkstoff- und Verarbeitungskompetenz. Die global tätige Unternehmensgruppe verfügt über rund 500 Konzerngesellschaften und -standorte in mehr als 50 Ländern auf allen fünf Kontinenten. Sie notiert seit 1995 an der Wiener Börse. Mit ihren Premium-Produkt- und Systemlösungen zählt sie zu den führenden Partnern der Automobil- und Hausgeräteindustrie sowie der Luftfahrt- und Öl- & Gasindustrie und ist darüber hinaus Weltmarktführer bei Bahninfrastruktursystemen, bei Werkzeugstahl und Spezialprofilen. Die voestalpine bekennt sich zu den globalen Klimazielen und verfolgt mit greentec steel einen klaren Plan zur Dekarbonisierung der Stahlproduktion.
