【摘要】 结合南京钢铁股份有限公司电炉厂方坯连铸机的生产实际,用数学模型初步计算凝固末端的坯壳厚度,利用射钉结果对数学模型进行修正,通过一定拉速下、一定钢种的温度场的计算,找出液芯为φ35-φ55 mm的位置,确定将末端电磁搅拌器安装在距弯月面8 m处。并利用特斯拉计现场测试二冷末端电磁搅拌器的磁感应强度,确定电流为550 A,频率为13 Hz时的参数为最佳搅拌参数。同时对一定条件下的铸坯进行了化学成分化验,结果表明经过末端电磁搅拌的连铸坯试样中心碳和硫的偏析程度与未经过末端电磁搅拌的试样相比有不同程度的减轻,冶金效果比较理想。更多还原

【Abstract】 The thickness of solidified shell of strand in secondary cooling zone was first calculated with mathematics model and then confirmed with pin-shooting in EAF Steelmaking Plant of Nanjing Iron and Steel Co.,Ltd..The position of crater end φ35～φ55 mm in diameter was found by calculation with modified mathematical model and pin-shooting for given casting speed and steel grades and after that the F-EMS was fixed at 8 m from meniscus. The optimal parameters for electromagnetic stirring were determined by teslameter:550 A and 13 Hz.The chemical composition at crater and of billets cast with and without F-EMS was analysed.The results showed that the carbon and center segregation coeffient of billet cast with F-EMS was decreased from 1.09% to 1.01% and the peak sulphur content in center was reduced obviously.The electromagnetic stirring parameters are suitable.更多还原