武钢CSP高铝钢浇铸过程水口结瘤问题研究

Study on clogging of submerged-entry nozzles during CSP casting high-Al steel in WISCO

对武汉钢铁股份有限公司CSP产线"BOF→LF→RH→CC"工艺流程生产高铝钢(w(AlS)=0.20%～0.45%)水口结瘤的现象进行了研究,研究表明造成水口结瘤的重要原因在于钙处理工艺不当,使钢中生成大量CaS和xCaO.yAl2O3类的高熔点复合夹杂物。通过钙处理工艺优化后,使得高铝钢的平均连浇炉数由原来的3.25炉迅速提高到10.86炉的水平,基本解决了CSP产线高铝钢钢水可浇性差的技术难题。

The phenomenon of nozzle clogging in refining the high aluminum steel （w（Als） = 0. 20 %~0. 45 %）by ＂BOF--LF--RH--CC＂process route in CSP line in WISCO is investigated and results show that the very important factor causing the noz- zle clogging lies in adoption of improper calcium treatment process leading to occurrence of a huge number of high melting point composite inclusions such as CaS and a：CaO＂ yA1203 in steel. Since optimization of the calcium treatment process the average heats of the continuous casting rises from the original 3.25 heats to 10. 86 heats and thus the dif- ficult problem of undesirable castability in refining the high aluminum steel in the CSP line is basically solved.