Plate blank tundish for preventing cast-on downward flow and preparation method thereof

Abstract

The invention relates to a plate blank tundish for preventing the cast-on downward flow and a preparation method thereof, belonging to the technical field of the ferrous metallurgy plate blank continuous casting tundish. Aiming at the situation that a steel collecting hole of a water feeding inlet is not higher than a nozzle block, the invention provides a method for solving the problem of the shedding of resisting materials and slag of a cover of the tundish and preventing the resisting materials and the slag shed to bottom of the tundish from entering the upper steel collecting hole of the tundish. The invention is characterized in that two preformed pieces 1 and 3 with the same structures and different sizes are respectively designed and disposed on an installing stopper rod of the cover of the tundish and the opening position of a roaster to replace a surrounding plate of the original opening position and casting materials, and a cofferdam 7 in a circular table shape is built by coating around the steel collecting hole of the water feeing inlet of the tundish. The plate blank tundish solves the problem that the resisting materials and the adhering slag of a liner of the cover of the tundish shed to block the water feeding inlet to cause the cast-on downward flow and the incontrollable accident of the plate blank tundish, prolongs the service life of the water feeding inlet and the tundish and is suitable for various continuous casting tundishs controlled by the stopper rod.

Description

technical field [0001] The invention relates to a slab tundish for preventing open pouring and a preparation method thereof, and belongs to the technical field of iron and steel metallurgy slab continuous casting tundish. Background technique [0002] The upper nozzle of the slab continuous casting tundish controlled by the stopper rod, the traditional process design is that the steel connection of the upper nozzle is flush with the nozzle block. In recent years, in order to solve the continuous casting machine's downflow and out-of-control accidents caused by the refractory materials and the adhered slag falling off and entering the upper nozzle of the tundish lining and the inner lining of the lid, the technological measures adopted are: The steel connection of the nozzle is designed to be 20-30mm higher than the nozzle block. The main defects in the production practice are: (1) The steel mouth of the upper nozzle is higher than the outlet block, so that the steel mouth o...

AI Technical Summary

Problems solved by technology

The main defects in the production practice are: (1) The steel mouth of the upper nozzle is higher than the outlet block, so that the steel mouth of the upper nozzle is directly exposed to the molten steel, and the corrosion and erosion of the molten steel are aggravated, resulting in the upper nozzle. The service life is greatly reduced, which affects the service life of the tundish. The continuous pouring time of a single tundish is generally controlled at 12 to 16 hours, which increases the refractory consumption of the continuous casting tundish and the remaining tundish injection; (2) The existing technology has not fundamentally solved the problem of castable and adhered slag falling off the inner lining of the tundish cover. The manufactured coamings are prone to high-temperature deformation and melting loss, which will cause local dropout of the castable at this part, and then aggravate the deformation of the cover steel shell after dropout, resulting in a vicious circle, which will lead to the gradual fall of the cover inner liner castable, which not only causes An important reason for the tundish to pour down, out of control, and also an important reason for the low service life of the tundish cover

(3) Since the refractory materials and slag of the tundish lining and the inner lining of the tundish fall off to the bottom of the tundish, they will flow into the upper nozzle of the tundish along with the steel flow in the early stage of ladle opening, so it cannot be completely eliminated Opening of the upper nozzle and downflow, out of control accident

(4) The pouring time of the tundish exceeds 12 to 16 hours, and steel penetration and steel penetration accidents are prone to occur at the junction of the nozzle seat brick and the bottom refractory material

This invention has improved the structure of the upper nozzle, and the disadvantages are: (1) The service life is relatively low, which is "the number of continuous pouring times is not less than 13 times", calculated according to the pouring time of each continuous casting machine for 35 minutes, a total of 455 minutes , and the service life is less than 8 hours; (2) The invention does not solve the problem of opening and pouring the upper nozzle

This invention improves the shape and material of the inner cavity, but has the following disadvantages: (1) The matching size design of the upper nozzle and the nozzle seat brick is also an important factor affecting its service life

For example, the steel opening of the upper nozzle is higher than the outlet block, so that the steel connection of the upper nozzle is directly exposed to the molten steel, which is eroded and aggravated by the molten steel, resulting in a significant reduction in the service life of the upper nozzle, generally 12 to 16 hours; ( 2) The invention does not solve the problem of opening and pouring of the upper nozzle

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