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Products and solutions, 2009-10-02, 12:00 PM

ThyssenKrupp VDM investing in Siegen site to modernize pickling unit

Renewed investment in environmental protection: Over a three-month construction period, ThyssenKrupp VDM (Werdohl) is modernizing the batch pickling unit at its Siegen site. Some 450 metric tons of soil have been excavated to make way for the new concrete backfill and the acid-resistant ceramic slabs which form the new foundations for the pickling unit at the Siegen plant (75 employees). Three years ago, ThyssenKrupp VDM – one of the world’s leading producers of nickel alloys and high-performance materials – modernized all electrical equipment of the neutralization facilities.

Pickling is an important step in the production of special stainless steels and nickel alloys. It removes the scale formed on the surface during hot rolling and heat treatment. The Siegen plant uses a pickling process with hydrofluoric or sulfuric acid to avoid the nitrogen oxides created when nitric acid is used. A further environmental aspect is the use of waste heat from the annealing furnace to heat the acid baths to the required temperature of 30 to 35° Celsius. This is done by plate heat exchangers set into the pickling unit. Plates measuring 2,500 by 8,000 millimeters and weighing up to 2,800 kilograms can be pickled in the new unit.

“The fully modernized pickling unit will enable us to take on contract pickling jobs for plate, bar, tube and sections,” says Uwe Peutz, production manager at ThyssenKrupp VDM’s Siegen plant.

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