Common Problem With Refractories For Tundish
Refractories For Tundish including permanent layer ca-stable,working layer dry material,Ccm Tundish Nozzle,Tundish Well Block,slag retaining wall series and three pieces of continuous casting.
Tundish Nozzle is the channel through which the molten steel enters the mold from the tundish, and needs to withstand the erosion of the molten steel and the sharp changes in temperature; the Well Block plays the role of protecting and fixing the nozzle and does not directly contact the molten steel. Zirconia Nozzle is mostly made of Zirconia Insert and high-aluminum outer, and the Tundish Well Block is generally made of high-aluminum materials.
Tundish Nozzle With Zirconia is easy to crack during the pouring process,leading to steel infiltration,which often forces continuous casting to block production or abnormal shutdown. The analysis believes that the Zirconia Nozzle cracking is mainly due to the poor thermal shock resistance of the Zirconium Insert.
Solution:The bulk density of the Zirconia Insert should not be too high. The highest the BD,the worse the thermal shock resistance. Appropriately thickening the nozzle body can prevent molten steel from seeping out.
