A year ago, the supervisory board of voestalpine AG gave the green light for preliminary work on climate-friendly steel production in Austria and this is already well advanced. Now the next approval step has been taken. With an investment volume of around 1.5 billion euros, one electric arc furnace each is to be built in Linz and Donawitz. The plan developed under "greentec steel" provides for the plant and supplier decision to be made before the end of 2023, construction to start in 2024 and commissioning of the two units in 2027. Up to 30 per cent of CO₂ emissions can thus be saved in the group from 2027. The exact start of implementation is still dependent on the clarification of open funding issues in Austria.

How steel production in Donawitz is going green. Our journey from coke- and coal-fired blast furnaces to a new route powered by green electricity.

Continuation and optimisation of the classic blast furnace-LD steel route with two blast furnaces and LD converters each, and preparation for the green steel production stages.

By commissioning an electric arc furnace (EAF) and removing one blast furnace and one converter, CO₂ emissions can be reduced by more than 30% group-wide. 

Our vision: With a clear and ambitious step-by-step plan to CO₂-neutral steel production by 2050. In order to achieve the goal of CO₂-neutrality by 2050, the voestalpine is already researching several, new processes and investing in pilot projects that show new ways in steel production. This includes the test plant at the Donawitz site for CO₂-neutral steel production through direct reduction of ores using hydrogen.

In order to meet the ambitious schedule for commissioning the new electric arc furnaces at the beginning of 2027, work has already begun on clearing the necessary construction sites and infrastructural conversion work at the two sites in Linz and Donawitz.

CO₂-neutral steel production by 2050 requires that electricity from renewable energy is available at an economic price. Wind power, hydropower and photovoltaic plants are to supply electricity from renewable energy for the energy-intensive processes in steel production in the future. At the Donawitz site, we are already working with various cooperation partners to tap into local renewable energy.

In addition to the connection to electricity generated from green energy sources, green steel production requires the increased use of scrap instead of ore. This sustainably conserves non-renewable resources and makes a significant contribution to reducing CO₂ emissions in steel production.

In the electric arc furnace (EAF), steel scrap and other iron carriers are melted down with powerful electric arcs. In detail, this means: Steel scrap is fed into the electric arc furnace. Three graphite electrodes are moved from the top of the electric arc furnace to just above the steel scrap, and with the help of electric current the electrodes generate an electric arc that reaches a temperature of 10,000 to 15,000 °C. The electric arc is then heated with natural gas and oxygen burners. The scrap, preheated with natural gas-oxygen burners, is melted for about 30 to 40 minutes and HBI (Hot Briquetted Iron) is added as required. During the steel melting process, a tapping temperature of 1,600 to 1,700 °C is reached and at the end of the melting phase, the slag and then the liquid steel are tapped off.

High capacity with maximum availability and flexible process control. Electric arc furnaces can produce the highest steel qualities by using correspondingly high-quality input materials such as HBI or high-quality scrap.

• The EAF is very flexible regarding the input materials that need to be processed
• Good controllability of the process temperatures
• The EAF can be operated in a cost-efficient, CO₂-reduced manner and optimized in terms of steel quality.