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The objective of this research is the development of a methodology for on-line determination of the end of the crater in continuously cast slabs. This measurement is necessary owing to the difficulties encountered in the development of mathematical models of the solidification of cc slabs suitable for the purpose. The methodology proposed using a new u.s. impact wave to measure the velocity in slabs. The principle is based on the different propagation time for ultrasonics through the slag due to the presence of a liquid part (crater or cone). Design data are derived from analysis of the plant receptivity of the cc slab line. These show that there is only one position in which to install the instrumentation, namely immediately downstream of the spray chamber. In that position the mathematical models of solidification predict the presence of the liquid cone, at least under certain process operating conditions. The experimental results show that the plant was too far down the line, because even in the most favourable operating conditions there was no liquid cone, or there remained only an extreme corner, with a thickness of less than 30 mm, which in-line experimentation showed to be the minimum detectable by the method adopted.

Additional information

Authors: CANELLA G, Centro Sviluppo Materiali SpA, Roma (IT)
Bibliographic Reference: EUR 13856 IT (1992) 59 pp., FS, ECU 7.50
Availability: (2)
ISBN: ISBN 92-826-3397-7
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