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The performance of casting powder during continuous casting and its effect on the occurence of both sticker breakout and surface cracking has been investigated by plant trials, laboratory simulations, physicochemical property detection, and mathematical modelling. It was concluded that both problems are related to the flow of slag into the mould/strand gap. Also, in order for sticker breakouts to occur it is necessary for two factors to be operative: (i) for a carbonaceous alumina agglomerate to cause a blockage which prevents the flow of slag into the mould/strand gap (ii) the local formation of a high carbon steel meniscus region which did not heal in negative strip time owing to its low melting point. The work carried out in this research programme substantiated these proposals and it was concluded that the agglomerate could be formed by alumina particles which accumulated in the SEN or stopper rod. The work showed that surface cracking (both longitudinal and star) can be related to variations in heat flux between the shell and the mould which arise from insufficient or erratic slag flow in the mould/strand gap.

Additional information

Authors: BILLANY T J H, British Steel Corporation, 9 Albert Embankment, London SE1 7SN (GB);MILLS K C, National Physical Laboratory, Teddington/Middlesex TW11 0LW (GB)
Bibliographic Reference: EUR 12140 EN (1989) MF, 175 pp., ECU 8, blow-up copy ECU 22.50
Availability: (2)
Record Number: 198911081 / Last updated on: 1994-12-01
Original language: en
Available languages: en
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