Combined with BOF ultra-low sulphur steel development experiment and production practice

the distribution of sulphur content in raw material for BOF is analyzed to get the sulphur content in hot metal with quantity of slag

scrap and lime makes up more than 70% of the total sulphur content in BOF charging. The effect of 150 t BOF top and bottom combined blowing converter [C

]

[O

]

products on end slag (FeO) and the effect of blowing time (0 ~ 15 min)

slag comprehensive basicity R(2 ~4)

( FeO) ( 15% ~ 25% ) and BOF liquid end temperature ( 1640 ~ 1700 °C) on slagsteel sulphur partition ratio L

s

= (S)/[S

]

are studied. Results by 20 heats non-oriented silicon steel AGW600 production show that with controlling BOF end [C

]

[O

]

products within 0. 002 8

binar

y slag basicity 3. 2 ~ 3. 7

BOF liquid end temperature 1675 ~ 1710 ℃ and ( FeO) in slag no more than 20%

the slag-steel sulphur partition ratio L

s

is up to 7. 0

the liquid end [C

]

and [S

]

are respectively 0. 025% ~0. 048% and 0. 002 4% ~0. 005 7% and the steel products [C

]

and [S

]

are respectively 0.0012% ~ 0. 0029% and 0.002 2% ~ 0. 0047%.