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齿轮钢8620RH(K)(/%0.18-0.22C,0.17-0.26Si,0.70-0.90Mn,≤0.025P,0.015-0.025S,0.4—0.6Cr,0.4-0.7Ni,0.15-0.25Mo,0.015-0.045A1,≤0.010 ON)的冶炼流程为60 t BOF—LF—VD-300 mm×360mm铸坯。分析了工艺改进前BOF终点残余元素,出钢量,精炼合金调整量,VD增N方式和铸坯C偏析,得出BOF出钢量不稳定、中间包钢水过热度高、内控成分合格率低,铸坯C偏析指数高是导致末端