RH / RH-OB
The 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.
In the Ruhrstahl Hereaus (RH) unit, vacuum treatment of the melt is carried out in a refractory-lined vessel equipped with two snorkels immersed in the steel bath. As system pressure is reduced, the melt rises into the vessel and circulation is induced by the injection of inert gas into the up-leg snorkel. The RH unit is usually employed for vacuum treatment and decarburization of long sequences of low-carbon steel grades.
Oxygen blowing rates of 2.000 - 4.000 Nm3/h and installed burner capacities of 2 - 4 MW are typical design features. For process supervision the lance can be equipped with a TV camera. In addition the Top Lance can be equipped with a powder blowing function in order to conduct a deep desulfurization of the steel.
RH / RH - OB:
- Fast decarburization down to 15 ppm
- Hydrogen and nitrogen removal
- Use of less expensive high-carbon alloys
- Chemical heating of killed and un-killed heats
Top Blowing Lance System:
- Oxygen blowing for forced decarburization and chemical heating
- Heating of RH vessel refractory material by gas /oxygen combustion
- Powder blowing for desulfurization Fast skull removal by usage of the oxygen jet
- Advanced ignition by external ignition facility
Argon Oxygen Decarburization (AOD)Argon 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.
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.
VD / VODThe 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.