METHOD OF PRODUCING LOW PHOSPHORUS STEEL IN LD VESSELS ON OPTIMIZED MAINTENANCE OF END BLOW CARBON RANGE

摘要

The present invention relates to a method of consistently and reliably producing a low phosphorus steel (P 0.010%) in LD vessel by optimized maintenance of end blow carbon range (0.005-0.030%) comprising the step of charging high phosphorus containing hot liquid metal of in wt% C- 4.3-4.4, Si- 0.4-1,P- 0.100-0.300 including other normal constituents (like Ti and S) and rest iron in a LD vessel of MgO lining converting the hot liquid metal to steel by a single blowing of high purity oxygen jet along with few additives like lime, iron ore at a temperature range of 1670-1710°C and maintaining end blow carbon (final carbon in the steel after blowing) in the range of 0.03 to 0.05% to obtain final steel with low phosphorus as low as 0.010% in a single shot.