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The major project trust was to increase the productivity of stainless steel continuous casters, mainly by increasing the casting speed.

Tuning of submerged entry nozzle (SEN) immersion depth with respect to slab width allows limiting the bath level fluctuations in the mould. Charts for control of these process parameters have been developed on the basis of a water model study using a variety of measuring methods.

In order to ensure high-speed casting the breakout prevention systems at each caster have been updated and improved (e.g. introduction of new versions of neural net system).

Developments in process control carried out allow an improved quality control of slabs

Results from trials with new casting powders developed for higher speed casting show that these powders grant regular lubrication and constant heat flow in the mould up to 1.3 m/min.

Industrial trials also showed that the number of deep oscillation marks on the slabs decreased with higher casting speeds. This was beneficial to slab surface quality. Generally, slight surface quality improvement was observed at increased casting speed.

The maximum productivity increase tested reaches 10 to 14 % compared to previous standard conditions. This was achieved without any difficulties in the process, using the above-mentioned developments. velopments.

Additional information

Authors: SCHELLER P.R, Krupp Thyssen Nirosta (DE);FISCHER M, Krupp Thyssen Nirosta (DE);MAURO S, Krupp Thyssen Nirosta (DE);SPACCAROTELLA A, Centro Sviluppo Materiali (IT);CIPRARI O, Centro Sviluppo Materiali (IT);GIGLI G, Centro Sviluppo Materiali (IT);SANTIS DE M, Centro Sviluppo Materiali (IT);RIDOLFI M.R, Centro Sviluppo Materiali (IT);HOOLI P, Outokumpu Polarit Tornio (FI)
Bibliographic Reference: EUR 19849 EN (2001), pp.105. Euro: 16.00
Availability: Available by EUR-OP Sales Agents
ISBN: ISBN: 92-894-1266-6
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