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The objective of the research project was to develop new water-cooled panels that allow reducing heat losses (and thus the overall energy consumption in EAF steelmaking) and increasing panels service life. CRM and ProfilArbed have concentrated their work on the water-cooled panels of the roof (industrial trials performed at the EAF plant of Differdange, Luxembourg), while CSM and Dalmine have worked on the upper side wall panels (industrial experimentation conducted at the EAF plant of TenarisDalmine, Italy). For the 'roof' group, several thermocouples were first fitted on the roof for calculating reference values for heat losses to spray-cooled panels. The initial proposition of replacing metallic slag retainers with small refractory parts was then extensively tested both at laboratory and industrial scales. Numerous refractory materials and fixing methods were put to the test, but none achieved satisfactory results during industrial trials. Three alternative approaches were thus tested through different industrial test campaigns: coating the EAF roof with different refractory gunning materials, an improved welding practice for the metallic slag retainers, and the installation of new copper slag retainers. The first approach gave satisfactory results only for the first heat after a maintenance shift, but was not a long-term solution. The second approach considerably increased the lifetime of the roof panels (by more then 70 %) by improving the cooling of the metallic slag retainers. Regarding the third approach (use of copper slag retainers) aimed at further improving the lifetime of roof panels, the first industrial trial in a 'cold' roof area gave very promising results. However, further industrial trials in the 'hot spot' area showed that copper slag retainers induce deformations in the roof structure, thus weakening the roof and creating an unacceptable risk of explosion due to water leaks.

Additional information

Authors: BORLÉE J, CRM, Angleur (BE);WAUTERS M, CRM, Angleur (BE);ZAMPETTI L, CSM, Rome (IT);VOLPONI V, CSM, Rome (IT);RONDI M, Dalmine, Bergamo (IT);PICCO M, ProfilArbed, Esch-sur-Alzette (LU);HOFFMANN J, ProfilArbed, Esch-sur-Alzette (LU)
Bibliographic Reference: EUR 22404 EN (2006), 85 pp. Euro: 15
Availability: Katalogue Number: KI-NA-22404-EN-S The paper version can be ordered online and the PDF version downloaded at:
ISBN: ISBN: 92-79-03055-8
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