低碳低硅钢中氧化物夹杂的控制

Control of oxide inclusion for low carbon and low silicon steel

重庆钢铁股份有限公司新区炼钢厂结合低碳低硅钢的生产实践,为改善钢水可浇性、避免因中间包水口堵塞而停浇的事故发生,对转炉后搅、顶渣脱氧和RH碳脱氧工艺进行了优化。工艺改进后,转炉终点钢水w(O)降低了127×10-6,渣中w(FeO+MnO)<5%,钢水中铝的加入量减少了0.38～0.43 kg/t,有效降低了钢中氧化物夹杂含量,钢中w(T.O)控制在(14～25)×10-6内。生产实践表明:采用"BOF→RH→CC"工艺路线生产低碳低硅钢,提高了钢水洁净度、单中包连浇炉数达18炉。

In order to improve the castability of molten steel and avoid casting break by nozzle clogging the processes of converter such as the post-stirring, top slag deoxidization and carbon deoxidization by RH are optimized on the basis of the production practice in low carbon and low silicon steel in Chongqing steel. Since the process improvement, the quality fraction of BOF end point oxygen has been decreased by 127 ×10^-6, the quality fraction of FeO and MnO in the slag reduced to less than 5%, addition amount of ferro-aluminum decreased by 0.38-0. 43 kg/t, oxide inclusion decreased effectively and the quality fraction of T. O controlled in the range of （14-25） ×10^-6. Production practice shows that by adoption of ＂BOF→RH→CC＂ processing route in production of low carbon and low silicon steel the cleanliness of the steel can be improved and the continuous casting heats of single tundish reaches 18 heats.