Silicon Control of Low Carbon and Low Silicon Steel with LF Refining

Analysis of controlling silicon content for low carbon and low silicon steel had been conducted from various aspects in this paper.Thermodynamics calculation results indicates that when in low-carbon and low Silicon steel and responding balanced silicon is,which implies that silicon pick-up is inevitable.Controlling the thickness of slag ≤ 100 mm after converter tapping and deep deoxygenation of the converter are helpful for silicon controlling. Control of acid aluminum in converter outlet at around 300×10^-6,and aluminum control ≤ 600×10^-6in the refining process can greatly reduce the amount of silicon recovery.Increasing the basicity by adding additional lime is good for inhibiting SiO₂ reduction and reducing the presence of glass slag and dark green slag is conducive to reducing the amount of silicon pick-up.Both controlling gas flow during refining process and using the combination of lime,fluorite and aluminum wire can reduce silicon pick-up and reduce the influence of smelting time on silicon prick-up.