New secondary metallurgy 5 also gets new alloying bunker

With the technology changeover to green steel production, the Linz site is changing continuously. A storage bunker for optimum plant supply with alloying elements has now also been erected for the new secondary metallurgy 5 (SecMet5).

In the secondary metallurgy plants, the raw steel is given its application-specific metallurgical and mechanical properties. Among other things, this is achieved by adding alloying elements. Bunker group 7 was installed as part of the erection of the hall for the SecMet5. It extends the infrastructure for the storage and provision of the required alloying materials used in SecMet5. The well-thought-out chamber concept of bunker group 7 offers optimum conditions for efficient operation and optimum plant supply, in order to manufacture premium quality green steel in the future.

Der Legierungsbunker (türkis) wurde mit Litzenhebern in die Endposition gehoben.

Bunker group 7 facts and figures

  • Total weight: 290 t
  • 22 bunker chambers in total 

  • 18 chambers, each with a usable volume of approx. 17 m³

  • 4 larger chambers, each with a usable volume of 25 m³

Special technology for assembly

Following delivery of the enormous bunker segments from May 2025, the preliminary assembly began. A particular highlight was the use of strand jacks for the assembly: The bunker was first exactly positioned on the ground and then raised and fixed together with the hall beams. This method enabled precise erection without the use of large tower cranes and led to considerable time and cost savings. The entire lifting process lasted only four hours.

About greentec steel

With greentec steel, voestalpine has an ambitious and viable phased plan in order to make its contribution to achieving the climate goals. In the first step, the Group plans to replace two blast furnaces with two electric arc furnaces (EAFs) from 2027. This involves an investment of around 1.5 billion euros.

With the partial changeover from the blast furnace to the electric steel route, by 2029, CO2 emissions will have been reduced by around 30 %. This equals a saving of almost 4 million metric tons of CO2 per year – which is almost 5 % of Austria’s CO2 emissions. greentec steel is thus the largest climate protection program in Austria. 

With the two electric arc furnaces, from 2027. voestalpine can produce approx. 2.5 million metric tons of CO2-reduced steel yearly, of which, 1.6 million metric tons in Linz and 850,000 metric tons in Donawitz. Find out more about greentec steel here.