应用PMO提高连铸坯生产拉速及成分均匀性

Improvement of casting speed and composition homogeneity of continuous casting billet under PMO

为了实现电炉厂提产增效的目标,研究了脉冲磁致振荡(PMO)在提高铸坯生产拉速中的应用潜能。结果表明,优化PMO处理参数可以适应生产拉速提高的要求,并改善铸坯的中心偏析和宏观偏析。当连铸拉速提至1.05m/min,PMO脉冲频率为1.16 KfHz,峰值电压为1.00 KiV处理参数(Kf和Ki分别为仪器的放电频率和电压峰值)时,铸坯横断面碳偏析指数可控制在1±0.05内;当连铸拉速提至1.15m/min,PMO脉冲频率为1.28 KfHz,峰值电压为1.00 KiV处理参数时,铸坯横断面碳偏析指数可控制在1±0.07内。试验证明,在高拉速条件下通过保证单位时间内对钢液施加的脉冲能量可以使连铸坯质量得到有效改善。

In order to achieve the goal of increasing the electric furnace plant production efficiency,the application potential of pulsed magneto-oscillation(PMO)in improving casting speed was studied.The results show that the optimization of PMO processing parameters can meet the requirements of increasing the production speed,and can improve the central segregation and macroscopic segregation of the billet.When the casting speed is raised to1.05 m/min,making the pulse frequency being 1.16 Kf Hz and the peak voltage being 1.00 KiV(Kfand Kiare the discharge frequency and the voltage peak,respectively),the cross section carbon segregation index can be controlled in the range of 1±0.05;When the casting speed is raised to 1.15 m/min,making the pulse frequency being1.28 Kf Hz and the peak voltage being 1.00 KiV,the cross section carbon segregation index can be controlled in the range of 1±0.07.The experiment prove that the quality of continuous casting billet can be improved by ensuring the pulse energy applied to molten steel per unit time under the condition of high drawing speed.