Pan degassing

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The ladle degassing (VD process, English vacuum degassing ) is a process of secondary metallurgy for decarburizing and degassing the melt . In contrast to the similar RH process, however, not part of the melt is sucked in, but the entire ladle is placed in a container, which is then evacuated . At the same time, the melt is flushed with nitrogen or argon . Because the steel does not leave the ladle, the system is less maintenance-intensive when operated correctly, but in contrast to this, only smaller batch sizes can be processed with the same ladle size . The pan must therefore not be completely filled. The aim of the treatment is to produce a pure steel that has largely lost its hydrogen . This can reduce the hydrogen brittleness of the material and the steel can withstand higher mechanical loads .

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