Abstract: The production process flowsheet of grinding ball steel B2 (/%: 0.75~0.85C, 0.70~0.90Mn, ≤0.030P, ≤0.030S, 0.40~0.60Cr, ≤0.20Ni, ≤0.20Cu, 0.010~0.060Al) is 120t BOF-LF-VD-180mmx220mm/260mmx300mm billet CC. With controlling BOF lance level and oxygen supplying rate, BOF heeling slag amount and optimizing bottom blown rate, and BOF full aluminium deoxidation； increasing LF refining slag basicity from 3.44 to 4.25, controlling VD process argon flow rate and soft blown ≥ 15min after VD ； in casting process with using integral stopper package in laddie, full shielding casting operation and liquid overheating extent 10~ 25℃, using special shielding slag for grinding ball steel and mold electromagnetic stirring 320A, 4Hz and finishing electromagnetic stirring 300A, 10Hz, the internal quality of slab of grinding ball steel is improved and each index of steel products meets the requirement.

摘要： 磨球钢B2（/%:0.75~0.85C,0.70~0.90Mn,≤0.030P,≤0.030S,0.40~0.60Cr,≤0.20Ni,≤0.20Cu,0.010~0.060Al）的生产工艺流程为120t BOF-LF-VD-180mm×220mm/260mm×300mm坯CC。通过转炉枪位及供氧强度控制、转炉留渣量及底吹流量的优化、转炉全铝一次脱氧;LF精炼渣系精炼渣碱度由3.44提高到4.25、控制VD氩气流量,VD后软吹≥15min;连铸使用整体塞棒包、全保护浇注工艺、钢水10~25℃过热度操作、使用磨球钢专用保护渣和结晶器电磁搅拌320A,4Hz末端300A,10Hz,提高了磨球钢铸坯的内部质量,钢材的各项指标满足标准要求。