TBM at Vizag Steel

BOF size:  150 t

# TBM tuyeres:  12

Stirring gases:  N2 and Ar

Stirring rates:  0.03 ~ 0.1 Nm³/tHM/min

Oxygen potential:  [C]*[O] < 24

Fe-content in slag:  %(T.Fe) < 18 %

Initial Phosphorous:  720 ppm

Final Phosphorous:  < 150 ppm

BOF campaign lifetime:  ≈ 2,500 heats

TBM lifetime:  ≈ 2,500 heats

Valve stations:  individual flow/pressure control