VD / VOD
The increasing demand for high quality steel makes the vacuum treatment an essential step in secondary metallurgy process. Tenova Vacuum Degasser units (VD) feature effective removal of hydrogen, oxygen and/or carbon, based on proven technology and experience
Vacuum Degasser (VD) allows to degas and decarburize the melt and provides the best conditions for desulphurization and inclusions removal. During the VD treatment, the liquid steel ladle is placed in a vacuum tank that can be of stationary or movable design according to the specific layout needs. Vacuum condition is achieved with a vacuum pump system, formed by mechanical pumps or steam ejectors. In order to promote stirring, inert gas is injected through porous plugs. VD can be equipped with an additional oxygen lance (VD-OB process) and further benefits, such as forced decarburization or chemical heating, can be obtained. Tenova's VD can be designed as a twin unit, in order to maximize productivity without sacrificing process quality, using a single vacuum pump system.
The VOD unit is mainly used for the production of stainless steel, it provides the most suitable condition for extensive decarburization and achievement of high-purity and cleanness. The unit is basically a tank degasser equipped with an oxygen lance, but specifically configured to withstand the heat load from an intense CO emission
It is normally used for deep decarburization of high alloy steel grades, usually to remove carbon without affecting chromium content in the production of stainless steel grades. The VOD unit can be operated as the sole decarburization unit after the furnace (DUPLEX process) or as a refining stage after rough decarburization with an AOD unit (TRIPLEX process).
All the units can be equiped with either mechanical pumps or steam ejectors.
- Hydrogen and Nitrogen removal
- Natural and forced decarburization
- Improved conditions for desulfurization with proper slag management
- Improved conditions for inclusion flotation
- Adjustment of temperature and composition
- Extensive decarburization with low chromium losses
- Use of less expensive high-carbon alloys
- High rate of chromium recovery with proper additions
- Chemical heating of liquid steel Hydrogen and nitrogen removal
- Improved conditions for desulfurization with proper additions Improved conditions for inclusion flotation
Value for Money
- low operation & maintenance cost
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AODArgon Oxygen Decarburization (AOD) is used during the refining process to produce steel with low carbon properties and low silicon levels, while creating a metal more weldable and more corrosion and heat resistant. It brings the tightest chemistry control to deliver the highest levels of metal purity.
RH / RH-OBThe Ruhrstahl Heraeus (RH) vacuum recirculation process is carried out in a refractory-lined vessel equipped with two snorkels immersed in the steel bath. The process is focused on decarburization and degassing and is the best suitable system for the production of Ultra Low Carbon Steel grades.
Twin / Single LF and Treatment StationsTenova Ladle Furnaces enable precise control of the melt temperature and of the chemical composition to guarantee improvement of productivity, flexibility and quality.