The invention relates to a production method for reducing the length of a water gap replacing blank in the continuous casting process and aims at providing the production method for reducing the length of the water gap replacing blank in the continuous casting process, meanwhile, a casting blank before water gap replacing is not affected, the cleanliness and the judgment level of the casting blank before water gap replacing are not lowered, and the quality of the casting blank and the high-grade casting blank proportion are improved. The production method comprises the following steps that the target pulling rate in the continuous casting process is set, the target pulling speed is reduced to the pulling rate when the blank is used for water gap replacing, the opening degree of a stopper rod is adjusted, and the liquid level of a crystallizer rises to the target water gap replacing liquid level, the pulling rate when the blank is used for water gap replacing is maintained, and the casting blank meets the fixed size requirement; after the fixed size is reached, the stopper rod is closed and kept closed, a water gap is replaced, the stopper rod is opened, and the pulling rate when the blank is used for water gap replacing is increased to the target pulling rate; the opening degree of the stopper rod is adjusted again, the liquid level of the crystallizer reaches the target liquid level, the water gap replacing work is finished, and the water gap replacing blank is cut off offline.

Production method for reducing length of water gap replacing blank in continuous casting process

The invention provides a replacing method for a submersed nozzle. The replacing method comprises the following steps of: recording weight of molten steel in a tundish when a large tank stops pouring, first-rate pulling speed, second-rate pulling speed, first-rate overall length, second-rate overall length and cast section width, calculating tundish pouring time through a formula, determining cast blank on which transition blank fixed scale is located, starting to decelerate on last piece of cast blank of the cast blank on which the fixed scale is located, and replacing the nozzle in a cutting seam, which corresponds to the cast blank, of the transition blank after decelerating; replacing the nozzle at a jointing seam of the fixed-scale blank; subtracting length of pulled-out fixed-scale blank of a crystallizer from normal fixe-scale length of the cast blank, starting to decelerate when the crystallizer is further pulled by 0.5 m, and calculating length of pulled-out fixed-scale blank of the crystallizer when pulling speed is reduced to be 0.8 m/min, keeping the pulling speed of 0.8 m/min for 1 minute at the jointing seam of the fixed-scale blank, thereby quickly replacing the nozzle. The replacing method can avoid waste products generated as a result of too great lapping defects of the cast blank, and greatly reduces quantity of 0-grade blank, so that a qualification rate of the cast blank is increased, and loss caused by waste products and degraded blank is reduced.

Replacing method for submersed nozzle

The invention discloses a method for eliminating flocculating flow blocking of an upper nozzle of a tundish. After replacement of a submersed nozzle in a flocculating flow state is invalid, a casting blank is pulled to a fast replacement position, a stopper rod is temporally closed to interrupt casting, a half submersed nozzle is used for replacing the original submersed nozzle obtained after flocculating flow blocking, oxygen is used for burning off inclusion in the upper nozzle of the tundish, then a new submersed nozzle is used for replacement, the stopper rod is opened to enable molten steel to smoothly flow down, and casting operation continues to be carried out. According to the method, the inclusion accumulated in the upper nozzle of the tundish is effectively removed so that the molten steel can be smoothly cast down through the upper nozzle; according to the method, damage of the long time and the low pull speed to equipment is eliminated, the equipment is protected to the largest degree, and the inner quality and outer quality of the subsequent casting blank are guaranteed; according to the method, flocculating flow blocking of the upper nozzle of the tundish can be eliminated within a short time, shutdown accidents are avoided, and production cost is greatly reduced; and the method is high in operability, safe, reliable and remarkable in application effect.

Method for eliminating flocculating flow blocking of upper nozzle of tundish

The invention discloses a method for detecting blockage of a submersed nozzle of a crystallizer. The method comprises the following steps that a tundish is cast by using molten steel, and the argon blowing flow of a stopper rod extending into the tundish is set to keep the argon blowing flow constant; the molten steel flows into the crystallizer from a gap between the stopper rod and the submersednozzle arranged at the upper part of the crystallizer; casting is carried out for 4-10 min, and the argon initial back pressure value P0 of the stopper rod is detected; if the casting time is more than 10 minutes, the rod position of the stopper rod is adjusted to adjust the amount of molten steel entering the crystallizer, and the argon back pressure value Pn of the stopper rod is monitored; andjudgment is carried out according to the argon initial back pressure value P0 of the stopper rod and the argon back pressure value Pn of the stopper rod: particularly, when the P0 ranges from 0.2 barto 0.6 bar, if Pn is greater than 0.8 bar, or when P0 is larger than 0.6 bar, if Pn is larger than P0 + 0.20, it is judged that the submersed nozzle of the crystallizer is blocked, and the accuracy is high.

Method for detecting blockage of submersed nozzle of crystallizer

The invention relates to a method for preventing secondary oxidation of molten steel. The method comprises the following steps that 1) conducting argon pipeline sealing inspection before casting, wherein argon is led into the position between a water inlet and an immersion water opening to be used for monitoring the sealing effect, and air leakage checking is carried out on an argon pipeline before casting; and 2) baking the immersion water opening, wherein on the premise of no leakage of the pipeline, in the baking process of the immersion water opening, the plate face temperature of the immersion water opening is controlled to be 350-450 DEG C. The method has the advantages that the argon is led into the position between the water inlet and the immersion water opening to monitor the sealing degree of the immersion water opening. Expanded graphite is arranged on a plate face of the immersion water opening, the sealing effect between the water inlet and the immersion water opening is improved, and the purity of high-quality steel is further improved.

Method for preventing secondary oxidation of molten steel

A continuous casting tundish allowing water feed opening blockage to be detectable on line comprises a tundish body, a water feed opening, a water feed opening argon tube, an inter-plate argon tube, an inter-plate argon tube opening, a water feed opening argon blowing opening and an inter-plate argon blowing opening. The water feed opening argon tube is connected with a water feed opening argon detection tube, the inter-plate argon tube is connected with an inter-plate argon detection tube, and the water feed opening argon detection tube and the inter-plate argon detection tube are connected with an argon header tube. The argon header tube is connected with a stop valve. The water feed opening argon detection tube is connected with a water opening argon flow detection meter and a water opening argon pressure detection meter. The inter-plate argon detection tube is connected with an inter-plate water opening argon flow detection meter and an inter-plate argon pressure detection meter. According to the continuous casting tundish, the flow and the pressure of water feed opening argon and inter-plate argon of the tundish in the steel casting process can be simulated on line, the work of the water feed opening and the inter-plate sealing condition of the continuous casting tundish can be judged, and therefore a condition can be provided for producing highly-clean steel, the quality of casting blanks can be stable, and the qualification rate of the casting blanks can be increased.

Continuous casting tundish allowing water feed opening blockage to be detectable on line

The invention relates to a quick replacement control technology for a tundish nozzle, and solves the problems that the working efficiency is low, the reliability is poor, and the casting blank quality is difficult to ensure in an existing tundish nozzle replacement process. According to the quick replacement control technology for the tundish nozzle, disclosed by the invention, when an old nozzle is replaced by a new nozzle, a stopper rod driver, a quick replacement device and a crystallizer liquid level automatic control system can be controlled by a PLC (Programmable Logic Controller), the replacement of the tundish nozzle can be completed quickly by replacing manual operation, the production efficiency is effectively increased, the operation is easy, the crystallizer liquid level can be reasonably and effectively recovered and controlled, the casting safety and the entity quality of casting blanks can be increased, and a phenomenon that steel is clamped in gaps of a quick replacement machine can be effectively and completely eradicated.

Quick replacement control technology for tundish nozzle

The utility model relates to a pre-centering device for a steel-smelting tundish immersing type water gap The pre-centering device mainly consists of support frames I, support frames II mounted symmetric to the support frame I, a connecting rod between the support frames I and the support frames II, sliding trays respectively formed in the support frames I and the support frames II, pre-centering plates placed in the sliding trays, center bolt holes in the pre-centering plates, and bolts in the center bolt holes The pre-centering device disclosed by the utility model can realize the purpose of pre-centering the water gap at a standby application position, and can directly fall downwards at a casting position, so that the time for replacing a tundish is greatly shortened, the tundish exchanging efficiency is improved, the risk for replacing the tundish is reduced, the tundish replacing time is not occupied, repeated centering is avoided, and the casting continuity is ensured

Pre-centering device for steel-smelting tundish immersing type water gap

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Continuous casting tundish allowing water feed opening blockage to be detectable on line

Quick replacement control technology for tundish nozzle

Pre-centering device for steel-smelting tundish immersing type water gap