Heat transfer in continuous casting moulds when using different mould powders

In continuous casting, the transfer of heat that takes place in the mould comprises several process steps. The transfer of heat crucial for the solidification of the steel is limited by the resistance in the gap between strand and mould. From comparing measurement and calculation results it is deduced that the slag formed from the mould powder, together with the shrinkage, controls the transfer of heat in the gap between strand and mould and also, therefore, the primary solidification of the steel. Crystallinely solidifying casting slags bring about a lower and more uniform heat transfer than vitreous slags in this regard. This is particularly advantageous when casting steels that are susceptible to cracking, such as e.g. peritectic grades.