连铸工艺参数对SWRH82B钢160 mm×160 mm坯中心碳偏析的影响

Effect of Continuous Casting Parameters on Center Carbon Segregation of SWRH82B Steel 160 mm×160 mm Billet

试验研究了结晶器电磁搅拌频率、拉速、过热度及二冷强度对SWRH82B连铸小方坯中心碳偏析的影响。研究结果表明,结晶器搅拌电流为300 A时,低电磁搅拌频率下铸坯中心碳偏析情况较好;拉速为1.8 m/min时,提高二冷比水量有利于改善中心碳偏析,但二冷比水量过高会加剧偏析;拉速为1.8 m/min时,二冷比水量为0.75 L/kg较为合适,拉速为1.9 m/min时,二冷比水量为0.8 L/kg是比较合适的;当过热度在20～30℃时,过热度对铸坯中心碳偏析的影响不大。

The effect of continuous casting process parameters including M-EMS stirring frequency, casting speed,superheat and secondary cooling water ratio on the center carbon segregation of SWRH82 B billet were investigated. The results indicated that low center carbon segregation index could be obtained in lower M-EMS stirring frequency with constant stirring current 300 A, center carbon segregation could be improved by increasing secondary cooling water ratio, but it would get worse with the further increase of secondary cooling water ratio; secondary cooling water ratio of 0. 75 L/kg was suitable for casting speed of 1. 8 m/min while 0. 80 L/kg was proper for 1. 9 m/min. In addition, superheat between 20 ～30 ℃ had negligible effect on the carbon center segregation.