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If steel of high quality has to be produced, the most important prerequisite is a slag-free pouring of steel. AMEPA is the worldwide market leader with its electromagnetic slag detection system ESD for ladles with more than 2000 vessels equipped with sensors.

Application
Technology
Publications

Application

In the production process, steel is poured several times from one vessel into another. But the slag which arises during each step of the process must not be transferred into the next vessel. Especially in the production of high quality steels carried over slag creates a very serious problem.

The electromagnetic detection system developed by AMEPA solves this problem successfully. There are already 250 systems installed worlwide with over 2000 vessels equipped with sensors and more than 370.000.000 tons of steel are supervised by these systems annually. This makes the AMEPA slag detection systems a worldwide standard and AMEPA the world leader in this technology.

In the steel plant environment all measurement equipment and sensors are expected to meet the highest demands in terms of reliability and robustness. The sensors, for example, must work in temperatures of up to 800° C.

The success on the market of this technology proves that AMEPA has successfully met these challenges.

Technology

The Measuring and Sensor Principle

An alternating current is fed into concentrically arranged coils of the sensor, thereby inducing eddy currents in the melt as it flows out. If there is any slag in the melt, the conductivity of the melt changes and the electromagnetic field increases slightly. This change is measured by a secondary coil system.

As a result of the concentric design of the sensor, a maximum field is generated in the melt and a strong signal is achieved. In addition, the measuring results are independent of the pouring velocity of the melt.

Customer specific sensors have been developed for the ladle and the tundish: They meet the customers‘ different requirements concerning easy installation and durability.

The AMEPA sensor consists of coils in a rigid steel cassette system that can easily be mounted or replaced. Usually there is no need to make major alterations to the ladle or furnace. Many users are able to change the sensor between two heats.

Publications

  • Tozaki, Y.; et. al.,: „Highly Productive Technology for Producing High Quality Slabs at Kashima Works." 76th Steelmaking Conference Proceedings, 1993, S. 377 - 382, Dallas, USA

  • Suda, M.: „Indication technique of converter slag detection tapping." CAMP-ISIJ Vol. 5 (1992)

  • Sekino, K.; Satoh, T.; Sakane, T.: „Improvement of Slab Quality under highly productive operation at SMI Kashima No. 3 Caster." Revue de Metallurgie-CIT, April 1992, S. 353 - 359

  • Russo, T. J.; Shevock, W. V.: „Practice and Process Improvements Implemented at the Sparrows Point Casting Facility." CCC 96, Mai 1996, Linz, Österreich, Paper No. 13

  • Pflipsen, H.D.; Zitzen, W.; Höffken, R.: „Automatisierung in den Stahlwerken der Thyssen Stahl AG – Verbesserung von Produktqualität, Anlagenflexibilität und Produktpalette." Stahl und Eisen 112 (1992) Nr. 5 S. 105 - 112

  • Nam, S. H.; Kim, J. I.: „Production of Clean Steel in Pohang Works." 3rd European Conference on continuous casting, 20. - 23. Oktober , 1998, Madrid, Spanien, S. 635 - 644

  • Mancini, J.; Asselborn A.: „Slag Detection in the Electric Arc Furnace at Ascometal’s Hagandange Works." MPT-Metallurgical Plant and Technology International No. 5 (1994) S. 50 - 51

  • Kato, H.: „Quality improvement of unstable zone by ladle slag detection system for continuous casting." CAMP-ISIJ Vol. 5 (1992)

  • Julius, E.; Theissen, W.; Block, F. R.: "Function and Application of an Electromagnetic Slag Detection System." Hüttenpraxis Metallweiterverarbeitung 24 (1986) Nr. 10, S. 906/13

  • Julius, E.: „Elektromagnetische Schlackenerkennung an metallurgischen Gefäßen." Stahl und Eisen 107 (1987), S. 397 - 402

  • Höfer, F.; et.al.: „Recent advances in steel cleanliness." Steel Research 64 (1993) No.1, S. 48 - 53

  • Harkness, B.; Dyson, D.: „Inclusion Control in Stainless Steels at Avesta Sheffield LTD." 2nd European Continuous Casting Conference, Juni 1994, Düsseldorf, Deutschland

  • Dewinter, G.: „Use of Fully Automatic Slag Detection with Stopper." Paper presented on the A.I.S.E. Convention, Sept. 25 (1995) Pittsburgh, USA

  • Dauby, P.H.; et. al.: „A Steel Quality Leapfrog -Detection and Elimination of Ladle- to- Tundish Slag Carry-Over." Iron and Steelmaker No. 29 (1990) S. 27 - 32

  • Cornelissen, M.C.M.; de Jong, W. A.; Rabenberg, J. M.: „Instrumentation to Monitor the Caster Condition and Casting Process at Hoogovens BOS No.2." 9th PTD Conference Proceedings, 1990, S. 95 - 99, Detroit, USA

  • Brinkmeyer, L.; Melville S.D.: „Cleaner Steel using Modified Ladle Shrouds and Higher Yields with Amepa." 77th Steelmaking Conference Proceedings, 1993, S. 271 - 274, Chicago, USA

  • Boss, D. L.; Hille, K. F.; Genma, N.; Eschen, T. J.: „Electromagnetic Detection in the BOP Vessel at USS/Kobe." 76th Steelmaking Conference Proceedings, 1993, Dallas, USA, S. 189 - 191

  • Bochent, G.; Allemand, B.: „Implementation of Amepa Slag detection, industrial results at SOLLAC DUNKERQUE." ATS Continuous Casting Mini-Congress, Paris, La Defense, 4. Juni, 1992

  • Block, F. R., Piotrowiak, R.: „Verringerung der Menge an Mitlaufschlacke bei der Stahlherstellung." Stahl und Eisen 116 (1996) Nr. 2, S. 95 - 99

  • Bading, W.; Hees, E.; Lax, W.; Richter, H.: Processes and Proceedings of the International Conference Secondary Metallurgy, Aachen, Sept. 21 - 23 (1987), S. 367 - 379

  • Allemand, B.; Zbaczyniak, Y.: „Mise en service a Sollac Dunkerque du systeme AMEPA de detection de passage du laitier de poche en repartiteur." La Revue de Matallurgie - CIT, Jan. 1994, S. 99 - 103

  • Abratis, H.; Julius, E.: „Mitlaufen von Schlacke beim Konverterabstich." Stahl und Eisen 108 (1988) S. 848 - 852