Abstract: Cleanliness in GCrl5 bearing steel produced by 120 t BOF-LF-RH-CC process investigated results show that the inclusions dominated in steel are Al₂ 0₃ . MgO spinel and Al₂ 0₃ -MgO-CaO type after LF refining and the Al₂ O₃ • MgO spinel is almost disappeared and the inclusions in steel are mainly liquid calcium aluminate after RH treatment. T. 0 content decreases to 5. 3 X 10^-6 after RH treatment and Al₂O₃ • MgO spinel regenerates in tundish liquid during casting, and the ≥20um calcium aluminate inclusions are not found in liquid at end RH and tundish, and in casting bloom.

摘要： 对“120 t BOF-LF-RH-CC”流程GCrl5轴承钢的洁净度研究结果表明,LF精炼结束以A1₂O₃ • MgO尖 晶石和Al₂O₃-MgO-CaO夹杂为主,RH真空处理后, Al₂O₃- MgO尖晶石几乎全部消失，钢中夹杂物以液态钙铝酸盐为主,T.0含量降至5.3x10^-6；浇注过程中间包重新成Al₂O₃- MgO尖晶石;RH终点和中间包钢水以及连铸坯未发现≥20um钙铝酸盐夹杂。