The invention discloses a control method for the steel tapping
slag condition of a high-carbon and high-
alloy steel 90t converter. The control method comprises the following steps that (1) during steel tapping alloying, a deoxidizing agent,
slag charge, carbon
powder,
alloy and
slag charge are added in sequence; (2)
alloy baking is performed, specifically, the alloy is added into an alloy baking furnace to be baked in advance before converter
smelting, it is guaranteed that the alloy becomes red during steel tapping, and the alloy temperature is 400+ / -50 DEG C; (3) steel tapping slag charge is processed, specifically, the alloy and the slag charge are added in batches according to different time periods; the amount of slag added in the steel tapping process is 4.5 kg / t-5.0 kg / t; (4) bottom blowing
system control of a steel tapping steel
ladle is performed, specifically, at least two bottom blowing ventilation chambers are opened in the steel tapping process, and bottom blowing is conducted through the single ventilation chamber after steel tapping is finished; and (5) the slag charge is supplemented when the temperature is increased to 1520-1550 DEG C after LF refined
molten steel arrives at the
station, and the dosage of the slag charge is 4.0 kg / t-4.5 kg / t. According to the method,
fluorite does not need to be added for slagging, the dosage of a slagging agent and the
power consumption are reduced, the refining time is shortened, and meanwhile, the cost is saved.