Community Research and Development Information Service - CORDIS

Abstract

HF1 Fos and HF2 Dk profiles have many features in common. The wear and tear of the walls covers a large area, the general profile of the crucible is bell-shaped and the edge of the crucible is particularly worn. Parallel to the wall a brittle layer joins the bell-shaped zone to the edge of the crucible. The wear and tear profile of Fos HF2, on the other hand, is quite different. Here, the erosion is cup-shaped rather than bell-shaped.

The degradation evident in the lower part of the crucible is probably due to a combination of chemical, hydrodynamic and thermomechanical processes that seems to be linked to the conditions under which the crucible is deployed during its working life. Thermomechanical stresses developing at the edge of the crucible probably exceed the resistance carbon exhibits when blow moulding takes place in the blast furnace. As a result, the weakened carbon exacerbates subsequent erosion caused by liquid flow. Thermomechanical processes, particularly the effects of zinc and alkalis, cause the brittle layer to form. The condensation of these elements, caused by thermal fluctuations in the wall combined with the oxidation of the bonding agents within the carbonised materials and metal impregnation may be responsible for the severe deterioration of the structure and physical properties of the carbon panels.

We have also developed a way to measure the thickness of the carbon wall using acoustic methods.

In addition we demonstrated that the uniform permeability of the crucible was absolutely necessary to achieve smooth liquid flow and prevent melting metal from reaching excessive speeds at certain points.

Additional information

Authors: VENTUTINI M.J, Institut de recherches de la siddrurgle fracaise, Vole Romaine, Maizaires-les-Mets Cedex (FR)
Bibliographic Reference: EUR 19339 FR (2000), Euro:11.50
Availability: Available from the European Commission, DG XII Communication Unit, rue de la Loi/Wetstraat 200, B-1049 Bruxelles (BE) Fax:+32-2-2958220 E-mail:rtd-info@ec.europa.eu Internet: http://europa.eu/comm/research/rtdinfo.html
ISBN: ISBN: 92-828-9234-4
Record Number: 200013236 / Last updated on: 2001-03-30
Category: PUBLICATION
Original language: fr
Available languages: fr