Abstract
Chemical composition of tundish powders play a very important role on steel cleanliness and nozzle clogging, specially in the case of Low Carbon Aluminum Killed Steels (LCAK Steels). The design of a good tundish covering powder should accomplish thermal insulation and, if possible, refining requirements. In this work, a thermodynamic analysis for choosing appropriate cover powders for LCAK steels is reported. A mathematical modeling for thermal behavior of this material is also presented. Under these fundamentals, a tundish practice was designed and implemented in the slab caster of IMEXSA Steel. Industrial results indicate that this approach was right: Nitrogen increments in steel at the caster decreased from 16 ppm with a previous practice to 5 ppm with the actual one. Steel desulfurization in the tundish was possible up to decrements of 0.004 wt% in sulfur contents. Nozzle clogging decreased from a frequency of nine deobstruction operations in casting sequences of 5-6 heats to only one in longer casting sequences of 7-8 heats.
| Original language | English |
|---|---|
| Pages (from-to) | 539-547 |
| Number of pages | 9 |
| Journal | Steelmaking Conference Proceedings |
| State | Published - 1996 |
| Externally published | Yes |
| Event | Proceedings of the 1996 79th Steelmaking Conference - Pittsburgh, PA, USA Duration: 24 Mar 1996 → 27 Mar 1996 |