Hans-Christian Schröter and Matthias Weinberg:
Development of a quick test assessing the reoxidation tendency of refractory gunning mixes
Reoxidation, reoxidation potential, oxide purity degree, oxide inclusions, continuous casting, carrier-gas-heat-extraction, CGHE
The subject of the work reported here is the development of a quick test for assessment of the proneness to reoxidation of MgO-based refractory mixes in a continuous caster´s tundish. The definitive occasion for a scientific discussion of this problem is provided by the growing demands made on the oxide cleanliness of steels for special applications. Safety-relevant products exposed to extreme loadings, such as bearings and tyre carcasses, in particular, necessitate steels of high cleanliness. Inclusions reduce strength and can, thus, result in premature failure of components.
The investigations performed here prove the suitability of CGHE (carrier-gas hot-extraction) as a quick test to be used in the casting bay. The results obtained correlate with both, the knowledge gained from commonly used standard tests, and the cru-cible tests performed in this study.
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