【作者】 王勇； 唐海燕； 吴拓； 李京社；

【Author】 WANG Yong;TANG Haiyan;WU Tuo;LI Jingshe;School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing;

【机构】 北京科技大学冶金与生态工程学院；

【摘要】 通过对国内某钢厂BOB-LF-CC工艺生产的50CrVA弹簧钢进行全流程连续取样,综合分析了冶炼过程中非金属夹杂物的变化规律。研究结果表明:精炼开始时钢中夹杂物以SiO₂-A_l2O₃-MnO-TiO₂类型为主,精炼结束夹杂物转变为CaO-Al₂O₃-SiO₂-（MgO）类型:铸坯中夹杂物主要为CaO-Al₂O₃-MgO和CaO-Al₂O₃-SiO₂复合氧化物夹杂,其中Al₂O₃含量较高,达60%-70%,没有得到低熔点夹杂物。热力学计算表明为使夹杂物充分转变为低熔点,需控制钢液中的钙含量在15ppm左右。实践中可通过提高炉渣碱度或喂入适量钙线实现。更多还原

【Abstract】 The evolution of non-metallic inclusions in 50 CrVA spring steel produced by BOF-LF-CC process was studied by the method of continuous sampling in different stages.The results show that SiO₂-Al₂O₃-MnO-TiO₂ system inclusion is the main type at the beginning of LF refining,and it transforms into CaO-Al₂O₃-Si02-（MgO） system inclusion at LF-end.CaO-MgO-Al₂O₃ and CaO-Al₂O₃-SiO₂ composite oxide inclusions are the main types in billets,in which the content of Al₂O₃ accounts for 60%-70%,and no low melting inclusion is obtained.Thermodynamic calculation show that calcium content should be controlled to approximately15 ppm to modify inclusions into low melting point,which can be achieved by the means of improving slag basicity and/or feeding the proper amount of Ca wire更多还原