The LF hot return slag process at Shougang is reutilized to refine steels including steel 82B

40Cr

20CrMnTi and 60Si2Mn. During refining special steels in LF with using hot reducing return slag

200 〜400 kg/heat of synthetic slag or active lime is added

the consumption of calcium carbide increases properly

and the slag is deoxidized by aluminum shot

calcium carbide and silico-ferrite powder. Production practice shows that with using this process the refining desulphurization rate is more than 50%

after LF refining the liquid oxygen activity ≤ 10 x 10

-6

the LF slag making materials- synthetic slag decreases by 5kg/t steel and submerged arc slag decreases by 2 kg/t steel

and the melting cost decreases by 7 yuan/1 steel. The hot refining slag has higher reutilization value.