Refractories and flow control systems for clean steel casting are technology drivers because the demands on steel cleanliness are permanently increasing. Clogging and nonmetallic inclusions in steel not only contribute to additional costs but also have an impact on the continuous casting process due to product downgrades and increased scrap rates. Since low pressures and high turbulence during liquid steel transfer from the ladle to the mould create sources of potential contaminations, special solutions to minimise nonmetallic inclusion formation are required as well as efficient ways to remove them. This starts in the ladle with specialised purging plugs for improved inclusion flotation and ends in the continuous casting mould with modelling to optimise liquid steel flow. Furthermore, in between these two process steps there are refractory systems in the RHI Magnesita product portfolio that can contribute to maintaining high cleanliness of the liquid steel on its journey from a batch process in the ladle to the continuous casting operation in the mould.

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