METHOD AND DEVICE FOR PRODUCING STEEL STRIPS BY MEANS OF BELT CASTING

摘要

The method comprises placing a metal melt (7) from a feed vessel to a rotating casting strip (3) of a horizontal strip casting system by a casting groove and a siphon-like outlet area formed as casting nozzle under protective gas, where several plasma beams (5) inerting and heating an active region sectorally impact onto the outlet-side area of the casting nozzle and the metal melt emerging from the casting nozzle during casting process. The power and temperature of the generated plasma beam are sectorally controllable. An inert gas or gas mixture with inert gas is used to generate plasma. The method comprises placing a metal melt (7) from a feed vessel to a rotating casting strip (3) of a horizontal strip casting system by a casting groove and a siphon-like outlet area formed as casting nozzle under protective gas, where several plasma beams (5) inerting and heating an active region sectorally impact onto the outlet-side area of the casting nozzle and the metal melt emerging from the casting nozzle during the casting process. The power and temperature of the generated plasma beam are sectorally controllable. An inert gas or gas mixture with inert gas is used to generate plasma, where the inert gas is argon or nitrogen and the inert gas with the additives of hydrogen, carbon monoxide, carbon dioxide or methane is used as gas mixture. The temperature of the emerging metal melt is targetedly influenced by impacting the plasma beam and the developed temperature drop is balanced from the feed vessel to the outlet area of the casting nozzle. The surface tension and the viscosity of the metal melt emerging from the casting nozzle are targetedly influenced. The plasma beam already impacts onto the outlet area of the casting nozzle before starting the casting process. An independent claim is included for a device for producing steel strips by strip casting.