Metal Refining Konverters
Argon-Oxygen Decarburization Refractory

Metal Refining Konverters (AOD)

Metal refining konverter is used for making stainless steel of various grades. Molten steel produced from induction furnace or electric arc furnace is poured into ladle & is subsequently poured into the converter with the help of E.O.T. crane. Before pouring the molten metal, some important parameters like its temperature & chemical composition are analyzed. Based on this analysis, molten steel is refined by the addition of required alloys & fluxes. Inert gases are also blown into the converter simultaneously.
AOD in Steel Plant
  • Decarburization.
  • To make stainless steel grades, alloy steel economically by using high-carbon Fe alloy and mild steel scrap/sponge iron.
  • This process is the air–oxygen– inert gas decarburization (AOD) process, for making stainless steel out of mild steel, mild steel out of high cast-iron melt, and alloy steel economically.
  • PLC-based gas mixing station of MRK gives flow measurements compensated for pressure and temperature variation. This avoids, “over oxidation” of liquid metal.
  • The imported transducer used for accurate flow and pressure measurement in the gas mixing station of MRK enables a high turndown ratio which results in the low process gas and refractory consumption and high recovery of alloying elements.
  • Use of dry air (-80o C dew point) as process gas reducing the cost of production.


  • Boiler quality MS plates are used for the fabrication of MRK vessels which are stress relieved and ultrasonically tested welding joints.
  • Dual brakes provide greater safety. One brake is thruster type while the other is spring applied air retract disk brake, which has a faster response time.
  • Trunion ring and shaft are specially fabricated from special alloys and all-welded portions are completely X-ray scanned. Fume extraction and pollution control system is provided with PLC-based controls of valves.
  • A planetary gearbox has been used to optimize space.
  • Feeding system for continuous charging of Ferroalloys and scrap at a controlled ratio.
  • The torque arm is used to absorb vibration on the foundation & gearbox.
  • Jerk – less rotation with angular position encoder.


  • PLC based MRK process control software uses unique blowing pattern selection system which reduces oxygen, nitrogen consumption and idle time during process.
  • Fully suspended drive mechanism to minimize vibration to the foundation and surrounding.
  • By-pass valve for safe operation.
  • Overall process display on touch screen HMI.
  • Recording facility helps improved traceability, quality, reliability and repeatability.
  • Printout of recorded data of gases and pressure help in monitoring each heat making process and composition.
  • Online costing of heat can be monitored from remote places.


We convey our sincere thanks and our appreciation to M/ s Electrotherm family for the development, realization, testing, qualification and commissioning of 10 MW power supply system for our Plasma Wind Tunnel facility. We are extremely glad that M/ s Electrotherm has taken up this challenging task, when no such system was existing in the country. We wish, we should have many more such collaborative ventures in future with M/ s Electrotherm and contribute to ISRO's futuristic advanced R&D programmes.
Mr. P.A. Krishnamoorthy, VSSC-ISRO
Hereby we feel glad to have 4000 KW/ 10 Ton DTi Furnace set along with HSMC lX Caster. We have commissioned this equipments in our plant on 21st May 2018 & found performance which was committed by Electrotherm was achieved. Electrotherm's project execution was extraordinary & their process understanding & support was remarkable. Looking to the performance of other equipments of other makes running within our group, we have found performance of Electrotherm make DTi Furnace to be best.

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