Abstract: In order to solve the problem of low manganese yield rate by adding manganese ore in the converter, the technology of converter tapping process with manganese ore direct alloying was studied. The results showed that the technology of converter tapping process with manganese ore direct alloying was feasible by the analysis of thermodynamics and dynamics. The plant practice of 100 t converter tapping process with manganese ore direct alloying showed that the manganese yield was more than 80 % and the maximum was 95 %, the comprehensive cost was reduced by more than 3.43 yuan/t. Meanwhile, the molten steel was rarely polluted and the content of sulphur，phosphorus was rarely increased.

Key words: converter, tapping, manganese ore, direct alloying, manganese yield rate