The production flow sheet for titanium-containing low carbon steel (/% : 0.05-0.10C

0.70-0.95Si

1.45-1.65Mn

≤0.025P

≤0.025S

0.10-0.20Ti) is BF hot metal-35 t LD-LF-150 mm x 150 mm casting process. For titanium-containing low carbon steel deoxidizing by minor aluminium due to higher A1

2

O

3

content in LF refining slag (/% : 55 ~59CaO

21.9-26.5SiO

2

9.4-14.3A1

2

O

3

)

during LF process the aluminium content in liquid increases and the 20 t tundish nozzle blocking easily occurs to effect casting smooth-going. Based on thermodynamics calculation

the steelmaking process is optimum including in BOF tapping non-adding manganese-aluminium iron and using low aluminium

silicon iron to replace common silicon iron

non-adding high alumina in refining slag and optimizing refining slag ingredient (/% ： 56.1-65.6CaO

19.3-27.2SiO

2

5.1-9.1 Al

2

O

3

)

the Al content in liquid decreases from original 0.007%-0.018% to 0.001%-0.009%

it is available to decrease the occurrence of nozzle blocking. The continuous-continuous casting heats increase from original 3 ~6 heats to 9-16 Heats.