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Abstract

The aim of this project was to address the thermal and mechanically induced stresses in the solidifying shell for slab, bloom and billet casting. This has been fulfilled by a combination of plant measurements and mathematical modelling work. Modelling of the strand in an ordinary bloom / billet mould was carried out by means of a coupled thermal-mechanical analysis using the finite element method, with the following conclusions:

- The shell thickness at mould exit is approximately 15 mm.
- The corners produce the maximum stress values, in the inner part of the solidifying shell.
- Maximum values of strain and strain rate occur on the sides close to the corners. These zones are known to be more prone to defects or cracking.
- Contact pressure increases continuously with distance to the meniscus. It increases most rapidly in the angles between the chamfer and the sides.

Other results of the project include the following:

- Measurements of heat flux using single thermocouples can reduce instrumentation costs.
- Taper has an effect on the temperature profile in the copper mould.
- Significant variations in taper are found during casting in moulds with individual plates.
- Thermocouple arrays in end plates can be used for detecting nozzle blocking and preferential flow.
- Use of mould level ramping to control submerged pouring/entry nozzle wear has a deleterious effect on quality.
- Evening out heat flux along the length of the mould improves surface quality.

Additional information

Authors: BUCKWORTH D A, Corus UK Ltd, Middlesborough (GB);HEWITT P N, Corus UK Ltd, Middlesborough (GB);MADILL J D, Corus UK Ltd, Middlesborough (GB);ALVAREZ DE TOLEDO G, Sidenor I+D, Bassauri (ES);BOURDOUXHE M, ProfilARBED Recherches, Esch-sur-Alzette (LU)
Bibliographic Reference: EUR 20171 EN (2002), pp.244. Euro: 37.00
Availability: EUR-OP reference: KI-NA-20171-EN-S Available from EUR-OP sales agents. URL: http://eur-op.eu
ISBN: ISBN: 92-894-3168-7
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