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.