The invention relates to an LF (
ladle furnace) refining method of low-
carbon steel. The comprises the following steps that 1) the endpoint carbon of a primary
smelting furnace is controlled to be 0.07-0.09%, and
alloy and
slag charge are added into the steel along with steel flow in the tapping process of the primary
smelting furnace; 2) after
molten steel reaches a refining position, power supply begins,
silicon carbide and a carburant are added for
diffusion deoxidation, and
argon is blown at the bottom of a large
ladle; and (3) after slagging, power is shut off,
argon bottom blowing is conducted for stirring, a primary sample is taken for analysis, the result is analyzed, the content of
molten steel components is adjusted according to the targeted component requirement, then
argon bottom blowing is conducted for stirring, sampling analysis is conducted again till the components of the
molten steel meet the targeted component requirements, and then tapping is conducted to obtain the low-
carbon steel. According to the method, the using amount of deoxidizing materials such as the carburant and
silicon carbide and the using amount of the bottom blowing argon in the refining
diffusion deoxidizing process are quantified, the influence of human factors is reduced, the problems that the using amount of the carburant and the
silicon carbide is greatly changed and molten steel components are greatly fluctuated in the refining
diffusion deoxidizing process of the molten steel are solved, and standardized operation of the molten steel in the refining process can be facilitated.