Effect of transients on quality of continuously cast product

TRANSIENT

The principal aim of this project is to improve the understanding of the causes and effects of transient condition on surface and internal quality during the continuous casting of a range of grades as slabs, blooms and billets. The transient conditions will include casting speed variations, strand stoppages, flow rate changes, ladle changes, flying tundish changes, start and end of casts, and grade changes.

This will allow new practices to be developed to eliminate or reduce the quality problems associated with transient events and new rules for downgrading as-cast material following transient events.

To meet this aim, the project has the following objectives:

• To collect process and quality data covering both steady state casting conditions and transient conditions. The data will cover a wide range of grades and slabs, blooms and billets. The data will be obtained by retrieving historical data and by performing plant trials.

• To analyse the data to determine the causes of transient conditions and to correlate the transient conditions with the as-cast product quality.

• To use a range of modelling techniques to develop a greater understanding of transient conditions and their effect on as-cast quality.

• To explore the influence of transient conditions on as-cast product metallurgy.

• To propose and validate new practices and downgrade rules for transient events.

 

The following principal deliverables are foreseen:

• An improved understanding of transient events, their causes and their effects on both surface and internal as-cast quality.

• New casting practices to eliminate or reduce the quality problems associated with transient events.

• New rules for downgrading as-cast material following transient events.

Start Year: 
2009
End Year: 
2013
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