How to deal with the deep decarbonization of vacuum furnace


Deep decarburization of vacuum furnace after disposal ultimately will be based on the disposal of oxygen to the resolution of molten steel in the abundance of content is still high, so that more than three hundred, they should increase the air flow under this situation, to promote the whole air traffic in 150 cubic meters per hour, and opened the booster pump, the whole vacuum to around 1 milli mpa, guarantee the circulation of misery time nine minutes, then, can effectively reduce them to 15 mm around, just water abundance of oxygen content is low, also can choose separation with carbon content and oxygen content.
With the decrease of the carbon content in the molten steel, the decarbonization rate becomes slow, and the carbon diffusion becomes a restricted link. In order to continue to stop the decarbonization, other measures must be taken. At this point, according to the light disposal after the oxygen content to determine the resolution. First, when the abundant oxygen content in the steel is still very high (more than 300ppm), it is necessary to improve the gas flow to 150Nm3/h, and turn over E3, E2, E1 booster pump, the vacuum reduced to about 1mbar, ensure 9 minutes of cycle decarburization time, can reduce the carbon to about 15ppm. Second, if the sufficient oxygen content of steel is low, the first carbon content and oxygen content can be separated. According to the experience formula, the demand for 100ppm carbon is about 150ppm oxygen, plus the abundant 200ppm oxygen, the demand for increased oxygen content can be calculated. Finally, T-COB oxygen gun was used to stop oxygen deep decarbonization. The consumption theory indicates that when the gun position is 4220mm, the oxygen pressure is 14 to 16bar, the oxygen flow is 1800 Nm3/h, and the oxygen content is 100Nm3 /h, the oxygen content in the steel can be increased by 550ppm. This allows the volume of oxygen blown to be calculated.

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