In order to study the desulphurization efficiency during LF refining ship plate and low carbon steels

every affecting factor is studied

the calculation results showed that only the initial sulfur content below 0.027% sulfur quantity in liquid steel could be removed below 0. 01% within 35 min which is LF average processing period； when controlling the slag (FeO + MnO) quantity below 0. 5%

basicity at 4

and MgO at 20% an 12% respectively

desulfurization efficiency is best； sulfur quantity is removed below 0.010%

then controlling dissolved oxygen in steel below 16 x10

-6

sulfur quantity is removed below 0. 003%

then controlling dissolved oxygen in steel below 5 X 10

-6

the slag quantity is controlled at 15 〜20 kg/t - steel

controlling the gas flow rate at 0. 6 ~0. 8 m

3

/min suitably; sulfur quantity decreased fastest in the first 20 mins

it could be controlled below 0. 010% in steel

then it decreased gradually

if sulfur quantity is removed to 0. 005%

refined processing time is more than 30 min usually.