en.Wedoany.com Reported - Thyssenkrupp Steel has restarted trial operation of its No. 4 hot strip mill in Duisburg after completing extensive repair work following a fire.

On the evening of October 24, 2025, a deflagration occurred in the furnace area of the mill, triggering a fire that primarily damaged the furnace and part of the roof structure. Over the past few months, the damaged equipment components have been fully repaired or replaced. Targeted technical optimizations and modernization measures were also implemented during the repair process, aimed at further improving equipment availability and process stability. The continuous caster associated with this equipment group resumed operation in mid-December last year.

The resumption of trial operation of the No. 4 hot strip mill is regarded as a key cornerstone for the stability, flexibility, and reliability of Thyssenkrupp's production network. Combined with the upgraded continuous caster and the new digital slab logistics system, one of the most modern production complexes in the European steel industry is now ready. Marco Richrath, Production Director of Thyssenkrupp Steel, stated that many employees have invested tremendous effort over the past few months to gradually restore the equipment to operational status in a relatively short period of time.

The No. 4 hot strip mill is central to the comprehensive modernization and optimization of Thyssenkrupp's steel production network, primarily used to produce hot-rolled flat steel products in various steel grades and dimensions. In addition to standard steels, the product range includes high-strength, thinner premium steels with stringent requirements for dimensional accuracy, surface quality, and mechanical properties. These products are used in the automotive industry (e.g., in the electric vehicle sector), mechanical and plant engineering, as well as the construction and energy industries. With the mill back in operation, Thyssenkrupp is well-prepared to reliably meet growing demands and safely handle challenging applications.

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