HEAT-TRANSFER IN CONTINUOUS-CASTING MOLDS WHEN USING DIFFERENT MOLD POWDERS

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