Abstract: Steelmaking flow sheet for GCrl5 bearing steel is 80 t top and bottom combined blowing converter-LF refi- ning-VD-180 mm x 220 mm CC process. The effect of CaO-SiO₂ -Al₂ 0₃ -CaF₂ -MgO refining slag series with basicity 3 ~ 8 on metallurgy quality of high quality GCrl5 bearing steel (/% ： 0. 95 ~ 1. 05C, 0. 15 ~0. 35Si, 0. 25 ~0. 45Mn, 1. 40 ~ 1,65Cr, W0. 025P, W0. 025S, WO.001 2[ 0]) is studied. Commercial production results show that with using 5. 8 basicity refining slag (/% : 50 ~55CaO, 6 ~ 12SiO₂, 15A1₂O₃, 10CaF₂, W0. 5FeO, W8MgO) , it is available to decrease the oxygen content and inclusions in steel, the oxygen content in GCrl5 bearing steel is (5 ~9) x 10^-6 , average oxygen content is 5. 6 x 10^-6 , the sulphur content in steel is 0. 005% ~ 0. 009% , and the rating of inclusion in steel is 0 ~ 0. 5.

摘要： GCr15轴承钢的冶炼流程为80 t顶底复吹转炉-LF精炼-VD-180 mm×220 mm连铸工艺。研究了碱度3～8的CaO-SiO₂-Al₂O₃-CaF₂-MgO精炼渣系对高品质GCr15轴承钢(/%:0.95～1.05C、0.15～0.35Si、0.25～0.45Mn、1.40～1.65Cr、≤0.025P、≤0.025S、≤0.001 2[O])冶金质量的影响。生产结果表明,采用碱度5.8的精炼渣(/%:50～55CaO、6～12SiO₂、15Al₂O₃、10CaF₂、≤0.5FeO、≤8MgO)可有效地降低钢中氧含量和夹杂物,GCr15轴承钢的氧含量为(5～9)×10^-6,平均氧含量为5.6×10^-6,硫含量达0.005%～0.009%,夹杂物0～0.5级。