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The presence of large solidification grains on the skin of cast products exacerbates the appearance of splits on the surface. The aim of this research is to ascertain the influence of the various parameters involved in the continuous casting process on the size of the grains on the outer skin. In the laboratory effects of superheating the liquid metal (from 30ºC to 95ºC) were studied, as well as the intensity of heat extraction, the convective state of the liquid, and the amount of carbon present. In laboratory experiments an increase in the intensity of the thermal extraction and forced convection of liquid steel led to finer grains. Industrial samples were also examined. The interpretation of the observations on these samples was made difficult by the simultaneous variations in several of the parameters. It appears, however, that the solidification grains are finer when the mould has been stirred. This also has the effect of reducing segregations. Smaller products also seem to have finer solidification grains than larger products, which can be explained in part by an increase in the intensity of the heat extraction. Generally, heating the mould should lead to a decrease in the size of solidification grains.

Additional information

Bibliographic Reference: EUR 18648 FR (1998) 72pp.
Availability: Available from OOPEC Sales agents
ISBN: ISBN 92-828-5146-X
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