08电磁制动对钢中非金属夹杂物的影响.docVIP

电磁制动对钢中非金属夹杂物的影响 战东平, 张慧书, 龚伟, 姜周华, 宋景欣 （东北大学材料与冶金学院，辽宁 沈阳 110004） 摘 要：通过对采用电磁制动和非电磁制动的铸坯中的夹杂物取样分析表明，采用电磁制动后，铸坯中心和边部的夹杂物平均直径和平均面积均有所减小，分别减少0.18μm和6.42μm2。未采用电磁制动时，在铸坯边部的A1、A5、B1、B5位置均有尺寸大于10μm的夹杂物，且其中有些夹杂物的成分与结晶器保护渣的成分相近。采用电磁制动后，在上述对应位置均未出现尺寸大于10μm的夹杂物。钢中的夹杂物主要为Al2O3、MnS和CaS夹杂物，还有部分复合夹杂物如Al2O3-MnS, Al2O3-SiO2以及少量含K、Na的夹杂物。未采用电磁制动的铸坯中含K、Na夹杂物的数量明显多于采用电磁制动的铸坯。 关键词：炼钢；连铸；电磁制动；夹杂物；板坯 Influence of Electromagnetic Brake on Non-metallic Inclusion in the Slab ZHAN Dong-ping, ZHANG Hui-shu, GONG Wei, JIANG Zhou-hua, SONG Jing-xin (School of Materials and Metallurgy, Northeastern University, Shenyang 110004, Liaoning, China) Abstract: The distributions of non-metallic inclusion in slabs produced with and without Electromagnetic brake (EMBR) were analyzed. It’s shown that, with the using of EMBR, the average diameter and area of the inclusions are less than those of the slab produced without EMBR, they are decrease 0.18μm and 6.42μm2 respectively. There are many inclusions in diameter bigger than 10μm in the slab border areas of A1, A5, B1 and B5, and the compositions of some of them are similar to those of the mold powder, but when EBMR was used, these inclusions disappeared in these areas. Most of the inclusions in the slab with or without EMBR are Al2O3, MnS or CaS, and there are some compound inclusions such as Al2O3-MnS, Al2O3-SiO2, few of them are the inclusions bearing K or Na element. The amounts of the inclusions bearing K or Na element in the slab produced without EMBR are more than those slabs produced with EMBR obviously. Key words: steelmaking; continuous casting; EMBR; inclusion; slab 1 前言 从上世纪80年代ABB公司和日本川崎公司联合开发成功电磁制动(EMBR)技术以来，电磁制动器已经在多台连铸机上获得了应用。生产实践已经证实，采用EMBR技术可以控制结晶器内钢液的流动，减少结晶器保护渣的卷渣，有利于结晶器内夹杂物的去除，从而提高铸坯质量，并有利于提高连铸拉速[1-2]。文献[3-5]对EMBR条件下钢中夹杂物的运动行为进行了模拟研究，文献[2]对EMBR条件下CSP结晶器内的夹杂物行为进行了模拟，并对铸坯中夹杂物的分布情况进行了分析。本文对电磁制动器对板坯中夹杂物的影响效果进行了研究，为该技术在国内的推广应用提供经验借鉴。 2 铸坯取样 在采用FC-Mold（Flow Control Mold）全幅二段电磁制动器的板坯连铸机浇注过程中（拉速1.9m/min，断面200×1200mm），先使用EMBR (输入上电流200A，下电流