A Method for Preventing Leakage of Molten Steel During Final Casting of Continuous Casting

Abstract

The invention relates to a method for preventing molten steel from being leaked out during continuous casting final pouring. The method comprises the following steps that after normal final pouring is finished, the speed of tail blanks is reduced to 0.35 m / min to 0.4 m / min with the accelerated speed of 0.15 m / min to 0.3 m / min, and the speed of the tail blanks is kept for 1-2 min; cutoff final pouring is carried out, meanwhile, the speed of the tail blanks is kept at 0.35 m / min to 0.4 m / min, and is kept for 2-3 min, and the water distribution proportion of secondarily-cooled steam water in a bending segment of a casting machine is reduced to 30% at the same time; detecting is carried out on the cutoff detecting stage, whether a crystallizer discharges slag or not is determined, and if yes, the abnormal final pouring step is started; the speed of the tail blanks is reduced to 1.2 m / min to 1.4 m / min with the accelerated speed of 0.15 m / min to 0.25 m / min<2>, and the tail blanks are completely pulled out. According to the method for preventing the molten steel from being leaked out during continuous casting final pouring, pouring bleeding accidents can be avoided effectively under the conditions of normal final pouring and abnormal final pouring.

Description

technical field [0001] The invention relates to a method for preventing molten steel from leaking out during final pouring of continuous casting. Background technique [0002] Continuous casting production is an effective technical method to realize continuous casting of molten steel, and has been widely used in steel production. Slab continuous casting has many advantages, such as high metal yield, low energy consumption, good billet quality, high degree of mechanization and automation, and has become an indispensable production process for iron and steel enterprises. [0003] figure 1 It is a structural schematic diagram of a casting machine used in the prior art, such as figure 1 As shown, 1 is the crystallizer, 2 is the curved section, 3 is the sector section, 4 is the arc section, 5 is the straightening section, 7 is the horizontal section, and 6 is the solidification end. The crystallizer 1 has a pair of short-side copper plates. If the pressure on the short-side co...

AI Technical Summary

Problems solved by technology

But this prior art has the following problems: it can only play a role of stretching at the very short part of the upper end of the tail billet shell, while other parts of the tail billet are still subject to cooling and contraction, and the molten steel still has the possibility of being extruded and risen, so it has not been fundamentally solve technical problems

The success rate of this method is not high, especially when casting a slab with a large width

In addition, the continuous casting machine with adjustable width crystallizer must be equipped with iron plates suitable for various widths, which has low adaptability and inconvenient operation.

This capping method has the disadvantages of long capping time, low success rate, difficult operation, high cost, high labor intensity and low safety.

[0008] In addition, the prior art in the patent literature with the notification number CN101053895 also needs to stir the molten steel with an oxygen tube and pump water to cool it to ensure that the empty shell has a sufficient length, but this requires the staff to operate above the molten steel, and the steel slag is exposed to water. The volume of the rear expands rapidly, and accidents of molten steel splashing and burns often occur, which poses a great safety hazard

Moreover, for the continuous casting machine that adopts the latest technology such as light reduction of the fan section and strong cooling of the secondary cooling, during the final casting process, the liquid molten steel that is not completely solidified in the billet shell is often compressed by the mechanical stress of the fan section and the contraction of cooling. After being extruded by the stress, it emerges from the tail, so it is difficult to avoid the accident of molten steel rising

[0009] As mentioned above, none of the existing technologies can completely solve the technical problem of molten steel leakage during the final pouring of continuous casting, and cannot effectively avoid the occurrence of rising accidents

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