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Vacuum tank degassing

The objective of the vacuum tank degassing treament is to remove tramp elements, such as oxygen, hydrogen, nitrogen or sulphur, from the steel. These aims are achieved by gas-stirring under vacuum atmosphere. However, clogging of the bottom nozzles constitutes a major problem. In order to counter this problem, vibration-based method was used to identify the effectivity of gas stirring and identify malfunctions.