PRODUCTION OF EXTRA-LOW CARBON SILICON-KILLED STEEL EXCELLENT IN CLEANING PROPERTY

摘要

PROBLEM TO BE SOLVED: To stably produce an extra-low carbon Si-killed steel having a small quantity of oxides and excellent in cleaning property by using a converter and an RH vacuum degassing apparatus. SOLUTION: In a producing method of the extra-low carbon Si-killed steel by executing an Si-deoxidation after decarburizing molten steel 3 refined in the converter by using the RH vacuum degassing apparatus 1, during the treatment in the RH vacuum degassing apparatus, flux is added into the molten steel in the range satisfying an inequality 0.001<=B/A<=0.01 which denotes the relation between pure CaO weight (B) in the flux 5 consisting essentially of CaO and the weight (A) of the molten steel to be treated.