The steelmaking flow sheet for boron steels such as 23 ~ 40MnB and 27MnTiB etc is 50 t EAF~LF + VD-CC process. It is available to increase the yield of boron to more than 90% by controlling EAF end [C

]

preliminary deoxidation by adding carbon powder

steel-cladding aluminum and silicon-manganese at tapping and before LF refining the solution oxygen in liquid ≤20 x 10

-6

controlling LF refining slag basicity 23. 5 and feeding aluminum wire to control LF end (FeO) + ( MnO) ≤ 1.5% and (SiO

2

) ≤15%

LF end [Al

]

≥20%

feeding steel-cladding titanium to control [Ti

]

0. 030% ~ 0. 050% and feeding cladding silicon-calcium wire to control the morphology of inclusions in steel

and before VD degassing treatment

bottom-blowing argon stirring and adding ferroboron or feeding cladding boron wire.