By means of the numerical simulation method,the mathematical model of inclusions movement in the mold is established under the condition of austenitic and fen-itic stainless steel slab production. According to the sim...By means of the numerical simulation method,the mathematical model of inclusions movement in the mold is established under the condition of austenitic and fen-itic stainless steel slab production. According to the simulation results, the main zones for inclusion particles accumulation were found and many factors that affected floating-up probability of inclusion particles were identified. These factors include the inclusion particle size, the casting speed and the slab width, etc. It is believed that the inclusion particle size is the key one among these factors.展开更多
合理的结晶器电磁搅拌参数和连铸二冷工艺制度,是提高不锈钢连铸坯质量的关键。本文以某钢厂1255 mm×200 mm 430铁素体不锈钢铸坯为研究对象,对其在现工艺下的连铸板坯质量进行了分析,并研究了电磁搅拌参数、二冷配水制度对连铸坯...合理的结晶器电磁搅拌参数和连铸二冷工艺制度,是提高不锈钢连铸坯质量的关键。本文以某钢厂1255 mm×200 mm 430铁素体不锈钢铸坯为研究对象,对其在现工艺下的连铸板坯质量进行了分析,并研究了电磁搅拌参数、二冷配水制度对连铸坯等轴晶率的影响规律。研究表明:在现行连铸冷却工艺下,430铁素体不锈钢连铸板坯等轴晶率偏低,约为30%左右,且随着电磁搅拌能力以及二冷比水量的增大,铸坯的等轴晶率逐渐降低,不利于连铸坯质量的提高。在此基础上,提出了基于提高铸坯等轴晶率的连铸冷却凝固过程电磁搅拌及二次冷却工艺参数,即降低电磁搅拌强度为300 A,5 Hz,以及采用二冷区弯曲段强冷+水平段弱冷的冷却措施。工业试验后,结晶器液面波动稳定在±3 mm,且430铁素体不锈钢连铸板坯等轴晶率基本在60%以上,降低了裂纹缺陷发生率,可为该类不锈钢连铸生产提供借鉴。展开更多
文摘By means of the numerical simulation method,the mathematical model of inclusions movement in the mold is established under the condition of austenitic and fen-itic stainless steel slab production. According to the simulation results, the main zones for inclusion particles accumulation were found and many factors that affected floating-up probability of inclusion particles were identified. These factors include the inclusion particle size, the casting speed and the slab width, etc. It is believed that the inclusion particle size is the key one among these factors.
