优化连铸工艺改善SWRH82A钢150 mm x 150 mm 铸坯中心碳偏析实践

 为了减轻SWRH82A钢150 mm x 150 mm铸坯中心碳偏析，进行了拉速(1. 9 ~2. 3 m/min)、二冷比水 量(0. 75 ~ 1.24 L/kg)、过热度(25 ~38 °C )、结晶器电磁搅拌强度(300 - 350 A)和末端电磁搅拌强度(300 - 470 A) 连铸工艺参数试验。结果证明,合理控制拉速1.9-2.0 m/min,钢水过热度25°C 左右、比水量为1. 01 I7kg、结晶 器电磁搅拌强度为350 A/3 Hz、末端电磁搅拌强度为400 A/7 Hz时，铸坯中心碳偏析指数可以得到大幅改善，由原 来的1.21降为1.05。

Optimizing Continuous Casting Process to Improve SWRH82A Steel 150 mm x 150 nun Billet Center Carbon Segregation

In order to reduce the center carbon segregation of SWRH82A steel 150mm x 150 mm cast billet, the experiments with different continuous casting processes including casting speed (1. 9 ~ 2. 3 m/min), water ratio in secondary cooling zone (0. 75 ~ 1.24 L/kg) , degree of liquid superheat (25 - 28 °C ) , mold electromagnetic stirring intensity (300 ~ 350 A) and end electromagnetic stirring intensity (300 ~ 470 A) have been carried out. The results prove that when the casting speed is 1. 9 ~2. 0 m/min, the liquid superheat is about 25 °C , the water ratio is 1. 01 L/kg,the mold electromagnetic stirring intensity is 350 A/3 Hz, and the end electromagnetic stirring intensity is 400 A/7 Hz, the billet center carbon segregation index can be large improved decreasing from original 1. 21 to 1. 05.