Flow Modelling in Continuous Casting of Round Bloom Strands with Electromagnetic Stirring |
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Authors: | Mirko Javurek Martin Barna Philipp Gittler Karin Rockenschaub Markus Lechner |
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Affiliation: | 1. Institut für Str?mungslehre und W?rmeübertragung, Johannes Kepler Universit?t Linz, Austria;2. voestalpine Stahl Donawitz GmbH & Co KG, Austria |
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Abstract: | For the majority of continuously cast semis for stringent applications such as wire rods, rails, seamless tubes, etc. an optimal cleanness, surface and sub‐surface quality as well as a minimum of centre line segregation and central shrinkage porosity is almost mandatory. In‐mould electromagnetic stirring (M‐EMS) has a number of functions but its primary purpose is to help breaking down coarse columnar dendritic solidification structure to produce a finer dendritic structure and a larger proportion of equiaxed grains. The rotary effect of M‐EMS has also an important impact on the cleanness of the steels, which can be explained by its action on exogenous and endogenous inclusions. The modelling of turbulent flow, steel temperature, solidification, exogenous inclusion transport and electromagnetic stirring with mathematical and ‐ as far as possible ‐ physical models are presented, including PIV‐measurements on a 1:1 scale water‐model of the strand. |
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Keywords: | continuous casting billet EMS FLUENT MHD non metallic inclusions CFD PIV |
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