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HomeMastering P-ESR technology for high nitrogen steel grades for high value applications
Mastering P-ESR technology for high nitrogen steel grades for high value applications
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To respond to the need to increase and guarantee the reliability of the P-ESR process for the production of high nitrogen steels in terms of nitrogen content of ingots, a better understanding about nitrogen pick-up from the gas phase at high pressure of nitrogen and its transfer through the molten slag to the metal was sought. Extended experiments at both pilot and industrial plant allowed the role of both slag composition and process parameters (mainly N partial pressure and melting rate) to be investigated: the result was the establishment of an optimised slag composition able to allow the highest N transfer from the gas phase to the molten metal and the confirmation of the positive role of a high nitrogen partial pressure as 40 bar. The activities concerned mainly a martensitic steel called Cronidur 30 with a minimum requested N content of about 0.35 % wt; a parallel activity was also carried out for two austenitic steels (P900N and P2000). Whereas standard production uses the continuous addition of N-rich compounds to the slag continuously during the process to reach the requested N content in the steel, experimentation at pilot plant and trials at industrial plant showed that a transfer of N just from the gas phase up to about 0.30 % wt is possible by the use of an optimised slag and high N pressure. Moreover, to guarantee the reliability of the P-ESR process in terms of nitrogen content in the produced ingots, a dynamic mathematic model, able to represent all the important nitrogen transfer mechanisms for the metal, has been set up to support a dynamic control tool of the process. Laboratory formability studies, thermomechanical processing in production conditions and mechanical testing on both steels confirmed the validity of the new P-ESR operation procedures set up in the project regarding quality aspects of the final product.
- Published:
- Corporate author(s): Directorate-General for Research and Innovation (European Commission)
- Personal author(s): Kleimt, B ; Carosi, A ; Paura. G
- Themes: Industrial research and development
- Subject: industrial research , iron and steel industry , materials technology , physical process , production improvement , research project , resistance of materials , testing
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| ISSN 1018-5593 | ISBN 978-92-79-15694-6 | DOI 10.2777/38725 | Catalogue number KI-NA-24347-EN-C |
- Released on EU Publications:
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