Papers by Keyword: Steel Continuous Casting

Abstract: The appropriate use and in adequate quantities of synthetic slags in continuous casting process (insulating coating powder in tundish and respectively lubricant molding powder in crystallizer) gives a good quality of continuous castings products. The paper presents two methods of determining the necessary of slags: using dispersion analysis software Minitab.v17 and optimization of heat transfer in tundish, depending on powder coating thickness, performed with a program made in Mathcad14 and respectively optimization of the molding powder thickness, using an own simulation program. Both methods are based on the properties of steel grade which is casted (in particular the liquidus temperature of the steel) and they can be adapted to the specifics of the continuous steel casting machines.

Abstract: Submerged Entry Nozzle (SEN) are usually made from a combination of carbon bonded alumina, zirconia and magnesia with graphite, which have been found to give the best response to the extreme demands of thermal shock, corrosion and erosion resistance. SEN brittle fracturing and clogging is a serious productivity and quality problem in continuous casting. The SEN critical area of failure is the steel flange where the SEN neck is fixed. Thermal shock or mechanical stress may cause cracking, which can result in premature failure. Preheating on optimal temperature before SEN installation is the standard procedure. Thermal stress effect on fracture behavior was done by analyze of material fractography, morphology, macrostructure and microstructure.