Analysis of nozzle clogging mechanism of low sulfur microalloyed medium carbon steel
Microalloyed medium carbon steel contains high aluminum which is easy to cause nozzle clogging after calcium treatment process.In this paper,X-ray diffractometer and scanning electron microscope were used to analyze the samples of nozzle clogging in continuous casting of low sulfur microalloyed medium carbon steel in a factory.Combined with thermodynamic calculation and analysis,the causes of nozzle clogging were revealed.The results show that the nozzle clogging is mainly CaS,which precipitates from the molten steel in both direct and indirect ways during the solidification process of molten steel.Excessive calcium addition is the main reason for nozzle clogging.Subsequently,the ratio of calcium to aluminum in molten steel can be optimized to ensure the smooth operation of continuous casting and eliminate the phenomenon of clogging.
microalloyed medium carbon steelcalcium treatmentnozzle cloggingcalcium sulfidethermomechanical analysis
万方数据
维普
