Production Practice on Control of Purity for Cord Steel in Pangang

Due to the extremely strict requirements on the control of [S],[N],[O] and [Ti] content in molten steel,tire cord steel is a kind of wire rods difficult to be produced. Pangang Vanadium Recovery and Steelmaking plant steelmake using hot metal with containing [V]and [Ti],the hot metal heat source is insufficient,and the elemente of [P]and [S]content is higher,so make the process of controlling cord steel production more difficult。Usually,using hot metal desulphurization control the content of [S] under 0.005%,though extending oxygen blowing time 3~5 min in the process of extract vanadium converter,can make the content of [Ti] below 0.003% in the semisteel,in the process of converter,controlling the end-point oxygen activity and the LF process refining using slag formation of reasonable slagging,RH vacuum treatment,can produce meetting the requirements of GB/T 10561-2005 steel cord.