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.
关键词
非调质钢/钙处理/水口结瘤/硫化钙/热力学分析
Key words
microalloyed medium carbon steel/calcium treatment/nozzle clogging/calcium sulfide/thermomechanical analysis
维普
万方数据