Stirring of molten steel during refining outside the furnace. It homogenizes the composition and temperature of molten steel and promotes metallurgical reactions. Most metallurgical reaction processes are phase interface reactions, and the diffusion rate of reactants and products is the limiting link in these reactions.
When molten steel is in a static state, its metallurgical reaction speed is very slow. For example, desulfurization of static molten steel 41140 in an electric furnace takes 30 to 60 minutes; while desulfurization by stirring the molten steel in furnace refining only takes 3 to 5 minutes.
When the molten steel is in a static state, inclusions float up and are removed, and the removal rate is slow; when the molten steel is stirred, the removal rate of inclusions increases exponentially and is related to the stirring intensity, type, and characteristics and concentration of the inclusions.