电磁技术在特殊钢大断面方圆坯连铸中的应用  

APPLICATION OF ELECTROMAGNETIC TECHNOLOGY IN BLOOM CASTING OF SPECIAL STEEL

作　　者：周干水 潘明旭 陈阳 Zhou Ganshui;Pan Mingxu;Chen Yang(Technology Quality Department of WISDR CCTEC Engineering Co.,Ltd.,Wuhan 430073,Hubei;Special Smelting Plant of Daye Special Steel Co.,Ltd.,Huangshi 435002,Hubei)

机构地区：[1]中冶南方连铸技术工程有限责任公司技术质量部,湖北武汉430073 [2]大冶特殊钢有限公司特冶厂,湖北黄石435002

出　　处：《河北冶金》2024年第9期55-62,共8页Hebei Metallurgy

摘　　要：钢水电磁感应加热和连铸坯电磁搅拌均为高效环保的电磁冶金技术,连铸已成为电磁技术应用最活跃的领域。介绍了二者在特殊钢大断面方圆坯连铸工程中的应用情况,并总结分析了中间包钢水感应加热、结晶器电磁搅拌(M-EMS)、二冷电磁搅拌(S-EMS)和末端电磁搅拌(F-EMS)技术的合理结构形式、工艺布置位置、组合应用模式及其应用效果等。实践证明,合适的电磁技术应用对特殊钢大断面方圆坯连铸具有良好的冶金质量效果,其中:电磁感应加热技术可将中间包钢水过热度控制在15±2℃,以实现高品质特殊钢连铸所需要的“低过热度-恒温浇注”关键工艺;大圆坯连铸采用三级联合电磁搅拌工艺、大方坯连铸采用二级电磁搅拌和凝固末端软压下(SR)工艺,对大断面特殊钢连铸坯的内部质量改善有显著效果,可达到铸坯中心缩孔≤0.5级、中心疏松≤1.5级、中心偏析≤1.10等高质量指标;采用中间包电磁感应加热可以保证的“低过热度-恒温浇注”及M-EMS+S-EMS+F-EMS(或SR)三级质量控制工艺,可以将连铸拉速在常规工艺的基础上提高50%以上。Molten steel electromagnetic induction heating and electromagnetic stirring of continuous casting billet are high efficiency and environmental protection electromagnetic metallurgy technologies.Continuous casting has become the most active field of electromagnetic technology application.This paper introduces the application of the two technologies in large section round and bloom continuous casting project of special steel,and summarizes and analyzes the rational structure form,process arrangement,combined application mode and effect of tundish induction heating,mold electromagnetic stirring,secondary cooling electromagnetic stirring and terminal electromagnetic stirring technologies.The practice has proved that the suitable electromagnetic technology has good metallurgical effect on the large bloom continuous casting of special steel.Among them,the electromagnetic induction heating technology can control the superheat of the molten steel in the tundish at 15±2℃,and realize the low superheat constant temperature casting process.The three-stage combined electromagnetic stirring technology is adopted in the continuous casting of large round billet,and the two-stage electromagnetic stirring technology and the soft reduction technology of solidified end are adopted in the continuous casting of large square billet.The high quality indexes such as central shrinkage hole≤0.5,central porosity≤1.5 and central segregation≤1.10 can be achieved.Using low superheat constant temperature casting and M-EMS+S-EMS+F-EMS(or SR)three-stage quality control process,the continuous casting speed can be increased by more than 50%.

关 键 词：特殊钢 方圆坯连铸 电磁感应加热 电磁搅拌 凝固末端软压下 铸坯质量 拉速 

分 类 号：TF777.2[冶金工程—钢铁冶金]