Abstract: The effect of final electromagnetic stirring (F-EMS) (160 A/4 Hz 〜280 A/8 Hz), temperature of liquid in tundish (1 500 〜1 542 ℃), casting speed (1.7 ~ 1. 9 m/min) and secondary cooling water ratio (0. 7 ~ 1. 1 L/kg) on center carbon segregation of 150 mm x 150 mm billet of 82B steel (/%: 0. 81C, 0. 76Mn, 0. 25Si, 0. 2Cr) with mold electromagnetic stirring (M-EMS) 240 A/4 Hz has been tested and studied. Results show that in condition without using FEMS, with decreasing overheat extent of liquid in tundish and casting speed, and increasing secondary cooling water ratio, the center carbon segregation index of billet decreases ； and in condition with using F-EMS with optimized parameter 160 A/ 6 Hz the carbon segregation of billet of 82B steel is minimum, that is 1. 02.

摘要： 试验研究了结晶器电磁搅拌240 A/4 Hz时末端电磁搅拌(160 A/4 Hz～280 A/8 Hz),中间包钢水温度(1 500～1 542℃),拉速(1.7～1.9 m/min)和二冷区比水量(0.7～1.1 L/kg)对82B钢(/%:0.81C、0.76Mn、0.25Si、0.2Cr)150 mm×150 mm方坯中心碳偏析的影响。结果表明,在未采用末端电磁搅拌时,降低过热度和拉速、提高比水量有利于减少小方坯中心碳偏析。采用最佳的末端电磁搅拌参数160 A/6 Hz时,82B钢小方坯中心碳偏析指数最低,为1.02。

关键词: 82B钢, 小方坯, 末端电磁搅拌, 连铸工艺参数, 中心碳偏析