IRONMAKING AND STEELMAKING
Vacuum Treatment Plants
Since the early ‘80s Danieli has been among the leaders in secondary refining for standard, specialty and stainless steels. The know-how gained over many years has been used to develop and optimize equipment and processes, and also to meet our customers’ most stringent requirements.
The vacuum treatment is used for simultaneous hydrogen and nitrogen removal, decarburization, deoxidation and desulphurization. Intensive gas stirring in fully inert conditions provides a good removal of non-metallic inclusions from molten steel.
Capacity: 10 - 300-t heats. An oxygen lance installed in the vacuum station makes it possible to carry out the VOD and VD-OB processes, which are principally used for stainless steels and ultra-low carbon steels for deep drawing applications.
The vacuum system can include a steam ejector vacuum pump designed with successive compression of process gas and steam with intermediate steam condensation (inter-condenser) or a dry mechanical multi-stage vacuum pump with several parallel skids / modules.