The influence of roll entry conditions on surface quality, solidification structure and dimensional control of direct cast strip produced from a twin roll casting machine
The project aimed to determine the processing conditions which lead to the best possible quality product using the twin roll direct strip casting plant at British Steel, Technology Centre. Research investigated the conditions in the roll entry liquid metal pool which influenced the surface quality, microstructure and dimensional tolerances of the strip product. During the first year a steel flow control and distribution device was designed and developed, with the aid of computer modelling. In the second year there was focus on producing a more homogeneous liquid metal flow distribution at roll entry. This was effected by means of a novel reduced-pressure delivery device. The result was a slower velocity of the steel at the exit ports, minimizing turbulence in the roll entry, and leading to significant improvement in process operating stability. A total of 35 trials, mainly with 304 grade stainless steel, were carried out, in order to eliminate defects in the product surface and to increase casting speed. Major advances in product quality, and an increased maximum casting length (to 200m) were achieved.
Bibliographic Reference: EUR 18608 EN (1998)
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Record Number: 199910510 / Last updated on: 1999-03-26
Original language: en
Available languages: en