LF refining method for changing SWRCH6A cold heading steel into HRB400E deformed steel bar

The invention discloses an LF (Ladle Furnace) refining method for changing SWRCH6A cold heading steel into HRB400E deformed steel bar. The method mainly comprises the following steps: according to the alkalinity and thin consistency of final slag of LF furnace outbound molten steel of SWRCH6A cold forging steel, adding low-alkali slag and carrying out bottom blowing argon gas strong stirring; then, according to the content W2 [Als]% of acid-soluble aluminum in LF furnace outbound molten steel of the SWRCH6A cold forging steel, LF molten steel of the SWRCH6A cold forging steel is outbound, low-alkali residues are added to reduce the content W2 [Als]% of the acid-soluble aluminum, argon is blown from the bottom to reduce the content W2 [Als]% of the acid-soluble aluminum, argon is blown from the bottom, and a calculated amount of scale is added; according to the process target, the LF molten steel of the SWRCH6A cold forging steel with the acid-soluble aluminum content W2 [Als]% in the LF furnace outbound molte