In spring steel 60Si2MnA and 55CrSiA steelmaking by EAF-LF-VD

it is available to control [ Als

]

≤ 60 x 10

-6

the total [O

]

(9 〜20) x 10

-6

and get the rating of A series inclusion ≤0.5

B series ≤0. 5

C series ≤ 1. 5 and D series ≤0. 5 by adding 17 ~ 23 kg/t low aluminum ferrosilicon (Al content ≤0. 50% ) during EAF tapping

adding more 3 ~6 kg/t ferrosilicon during LF refining and controlling basicity of refining slag ≤2. 5. The molten steel produced by this deoxidation process has excellent castability being available for mass production.