Method for improving pourability of low-carbon aluminum killed steel molten steel

The invention discloses a method for improving the pourability of low-carbon aluminum killed steel molten steel, and relates to the technical field of smelting. According to the method for improving the pourability of the low-carbon aluminum killed steel molten steel, a vacuum refining agent added to RH is of a pre-melting type, the action mechanism of the vacuum refining agent on inclusions is mainly an "adsorption+isolation layer" effect, the vacuum refining agent is prepared from the chemical components in percentage by mass: 38%-48% of CaO, 20%-30% of Al2O3, less than or equal to 5% of SiO2, 18%-22% of metal aluminum, less than or equal to 0.15% of T.C and the CaO/Al2O3 ratio is 1.60-1.90, has better adsorption capacity of inclusion, the particle size is 3-30mm, the melting point is about 1350 DEG C, the content of the pre-melted slag accounts for 50%-60%, and the main phase is about 57% of (CaO)12(Al2O3)7. According to the method for improving the pourability of the low-carbon aluminum killed steel molte