Abstract: The evolution of inclusions in gear steel 18CrNiMo7-6 produced by 70 t EAF + LF + RH process is systematically analyzed and studied by means of whole process sampling and ASPEX test. The test results show that sampling after adjusting the composition during LF refining the removal rate of inclusions with size 1 ~ 10 μm is 89% , with > 10 μm is 97% , from adjusting the composition during LF refining to the end of soft blowing, and the removal rate of size 1 ~ 10 μm inclusions reaches 54% removal rate of inclusions > 10 μm is 66% , and the inclusions > 20|im are basically removed. The inclusion completes the transformation from Al₂O_3 → Al₂O_3 · MgO →Al₂O₃ · CaO.

摘要： 采用全流程取样,利用ASPEX全自动扫描分析法进行检验,对70 t EAF+LF+RH工艺生产的齿轮钢18CrNiMo7-6钢中夹杂物特性的演变规律进行系统的分析和研究,试验结果表明,LF精炼调整成分后,夹杂物数量去除率粒径1～10μm为89%,> 10μm为97%,从LF精炼调整成分后至软吹结束,夹杂物数量去除率粒径1～10μm为54%,> 10μm为66%,>20μm的夹杂物基本清除。夹杂物完成了Al₂O₃→Al₂O₃·MgO→Al₂O₃·CaO的转变。

关键词: 70 t EAF + LF + RH, 18CrNiMo7-6齿轮钢, , 夹杂物, ASPEX分析