Method for controlling slag bonding of vacuum chamber

Abstract

The invention discloses a method for controlling slag bonding of a vacuum chamber. The method comprises the following steps of: when IF (Intermediate Frequency) steel is produced, carrying out pressure control over an RH (Rockwell Hardness) furnace: controlling the pressure of the vacuum chamber to be 25KPa within 0 to 2min; controlling the pressure of the vacuum chamber to be 15KPa within 2 to 3min; and omitting the pressure control after 3 min; when medium carbon steel is produced and the mode of the process path of direct pouring on a machine after treatment by an LF (Ladle Refining) furnace is changed into the mode of direct pouring on a machine after treatment by the RF furnace, controlling the weight of the tapped carbon from the converter to be 0.03-0.06 percent; in the tapping process of the converter, adjusting components such as aluminum, silicon and manganese only; raising the tapping temperature by 10-15DEG C on the basis of an original process path of the LF furnace; reducing the temperature rise oxygen blowing amount of the RH furnace; ending the final deoxidation of the RH furnace; and adjusting the carbon component. Therefore, the splashing of molten steel is relieved; the slag bonding of the vacuum chamber is reduced; the blocking probability of an alloy blanking hopper is reduced; the labor intensity of operators is relieved and the influence caused by accumulated slag falling on the components of the molten steel is avoided and further the quality of the IF steel and smooth operation of the products are ensured.

Description

technical field [0001] The invention belongs to the field of iron and steel smelting process control, and in particular relates to a method for controlling slagging in a vacuum chamber of a vacuum circulation degassing furnace (RH furnace). Background technique [0002] Pressure control measures are generally not taken when RH furnaces are used to produce IF steel (ultra-low carbon steel), so molten steel splashes are very serious. Especially when the process route of the steel casted directly on the continuous casting machine after being processed by the ladle refining furnace (LF furnace for short) is changed to being processed by the RH furnace and directly put on the machine, since the converter is tapped according to the killed steel, and the carbon is adjusted Therefore, during the oxygen blowing operation of the RH furnace, the carbon-oxygen reaction is violent, resulting in splashing, and slagging is formed in the vacuum chamber of the RH furnace, which leads to t...

AI Technical Summary

Problems solved by technology

[0002] Pressure control measures are generally not taken when RH furnaces are used to produce IF steel (ultra-low carbon steel), so molten steel splashes are very serious

Especially when the process route of the steel casted directly on the continuous casting machine after being processed by the ladle refining furnace (LF furnace for short) is changed to being processed by the RH furnace and directly put on the machine, since the converter is tapped according to the killed steel, and the carbon is adjusted Therefore, when the RH furnace is blowing oxygen, the carbon-oxygen reaction is violent, resulting in splashing, and slagging is formed in the vacuum chamber of the RH furnace, which leads to the blockage of the alloy lower hopper, so it needs to be cleaned manually, which is very difficult

At the same time, another hidden danger is that the slagging in the vacuum chamber may fall off into the molten steel at any time, pollute the molten steel, and pose a great threat to the quality of the steel grade