On the Mechanism of Conglomerate Formation from Nonmetallic Inclusions Based on Al2O3–CaO–MgO System in the Production of Steel at Modern Metallurgical Complexes

Resumo

The results of studies on the formation of nonmetallic inclusions (NMI) of the Al₂O₃–CaO–MgO system and pinholes in rolled steel produced at modern metallurgical complexes are presented. It is shown that the mechanism of NMI conglomerate formation on the surface of the batching cup and the submersible cup under outflowing non-calcium-treated steels containing aluminum from the tundish ladle is valid as applied to teeming with the modification of NMI. An assessment method is proposed for the efficiency of the out-of-furnace steel processing technology of obtaining steel purified from NMI and with optimally modified NMI. The proposed method consists in assessing the range of stopper movement in the course of steel teeming.