A method for controlling inclusions in ultra-low carbon steel based on a straight cylinder vacuum refining device
A technology of vacuum refining and device control, which is applied in the field of steelmaking, and can solve the problems of easy adhesion of inclusions on the nozzle wall, high alkalinity, and impossibility of slag-gold reaction.
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Embodiment 1
[0022] This embodiment adopts the following scheme, including the following steps:
[0023] (1) The final molten steel volume of the converter is 119.5 tons, the temperature is 1635℃, the molten steel [C]: 0.038%, a[O]: 762ppm, the tapping does not deoxidize, and the bottom of the ladle is blown with argon during tapping; after tapping is completed, Transfer the ladle to the position of the straight-tube vacuum refining device, slowly lift the ladle, the top slag in the ladle spreads over the lower edge of the dip tube, and then slowly vacuumize the ladle top slag into the vacuum chamber for 1 min, and the pressure in the vacuum chamber is maintained At 15000Pa; then open the argon blowing nozzles evenly arranged on the circumference of the immersion pipe wall, the argon blowing flow rate of each nozzle is equal, and the total blowing argon flow rate is 3NL / t.min;
[0024] (2) Slowly lift the ladle until the dip tube is inserted 50mm below the molten steel level in the ladle, adjus...
Embodiment 2
[0032] This embodiment adopts the following scheme, including the following steps:
[0033] (1) The final molten steel volume of the converter is 121.3 tons, the temperature is 1629℃, the molten steel [C]: 0.038%, a[O]: 762ppm, the tapping does not deoxidize, the bottom of the ladle is blown with argon during tapping; after tapping is completed, Transfer the ladle to the position of the straight-tube vacuum refining device, slowly lift the ladle, the top slag surface of the ladle spreads over the lower edge of the dip tube, and then slowly draw the vacuum to suck the ladle top slag into the vacuum chamber for 1.5 minutes, and the pressure in the vacuum chamber Keep it at 14000Pa; then turn on the argon blowing nozzles evenly arranged on the wall of the immersion tube. The argon blowing flow rate of each nozzle is equal, and the total blowing argon flow rate is 3NL / t.min;
[0034] (2) Slowly lift the ladle until the dip tube is inserted 50mm below the molten steel level in the ladle...
Embodiment 3
[0042] This embodiment adopts the following scheme, including the following steps:
[0043] (1) The final molten steel volume of the converter is 120.8 tons, the temperature is 1640℃, the molten steel [C]: 0.035%, a[O]: 728ppm, the tapping does not deoxidize, and the bottom of the ladle is blown with argon during tapping; after tapping is completed, Transfer the ladle to the straight-tube vacuum refining device station, slowly jack up the ladle, the top slag in the ladle spreads over the lower edge of the dip tube, and then slowly draw a vacuum to suck the ladle top slag into the vacuum chamber for 2 minutes, and the vacuum degree of the vacuum chamber Keep it at 20000Pa; then turn on the argon blowing nozzles evenly arranged on the circumference of the immersion pipe wall, the argon blowing flow of each nozzle is equal, and the total blowing argon flow is 3NL / t.min;
[0044] (2) Slowly lift the ladle until the dip tube is inserted 50mm below the molten steel level in the ladle, ad...
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