Optimization of ladle furnace refining process for different desulfurized steels
Aiming at the unreasonable problems existing in the refining process of 1#ladle refining furnace(LF)of a steel plant,the production test is carried out with Q355ND steel(w(S)≤0.005%in the finished product)as the deep desulfurization steel and Q235B steel(w(S)≤0.020%in the finished product)as the low desulfurization steel.Based on the principle of measuring alternating current by Rogowski coil and calculating the power consumption of LF furnace,the influence of argon flow and slag-making material on the effect of desulfurization was studied through the analysis of arc current,phase voltage and main process parameters,and a reasonable process adapted to the production of different degrees of desulfurized steel grades was proposed.The results show that the refining process is more reasonable when the dosage of lime,slagging agent and alloy in Q355ND steel was 8.50-10.00 kg/t,1.26 kg/t,1.92 kg/t,and when the dosage of lime,slagging agent and alloy in Q235B steel was 4.74-5.00 kg/t,1.20 kg/t,1.71 kg/t,respectively.When the ladle permeability is better,the argon flow rate during the power supply is about 380-400 L/min,and the unenergized argon flow rate is about 100 L/min.two power supply modes are used,and the production effect is better.
ladle refining furnacedesulfurizationpower consumptionpower supply systemrefining process
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