Treatment method for slab retention in slab continuous casting

Abstract

The invention relates to a treatment method for slab retention in slab continuous casting. The treatment method is characterized by comprising the following steps: firstly, confirming slab retention reasons divided into two kinds according to all slab retention conditions suffered by domestic and abroad slab continuous casting machines at present: 1) long continuous casting machine downtime caused by equipment faults and operation reasons, slab retention caused by slab supercooling or slab retention resulted from the condition that the local thickness of a slab exceeds a set value because process, continuous casting cooling and hydraulic equipment faults appear; and 2) slab retention resulted from cold steel jamming and bonding of the slab and other equipment of the casting machine because the continuous casting machine suffers from process abnormity accidents including steel leakage and steel overflow; and next, adopting an optimal control method for different streamline secondary cooling water quantities, an optimizing method for different sector section lifting and slab drawing pressure and speed settings and a cutting method for accidents with different coal gas-to-oxygen ratios according to the different reasons.

Description

technical field [0001] The invention relates to a method for treating stagnant slabs in continuous casting of slabs, belonging to the technical field of continuous casting of iron and steel metallurgy. Background technique [0002] In the current metallurgical enterprises, most slab continuous casting machines mainly include main equipment such as mold, 0# section, sector section, straightening section and horizontal section. During the production process of slab continuous casting, there will be production accidents in which the slab cannot be pulled out smoothly in the continuous casting machine due to hydraulic system failure, transmission system failure, or other production accidents. For "stagnant blank". Continuous casting stagnation is a major production accident in the continuous casting production process. After the stagnation occurs, the production will be stopped for several hours or even dozens of hours, which will seriously affect the output of the continuous c...

AI Technical Summary

Problems solved by technology

Therefore, the method announced in the plan according to the casting speed and the method of water distribution during the process of stagnant billet processing has great limitations and disadvantages

In addition, the lifting and pressing methods of the sectors announced do not carry out differential control and pressure setting for the pressing and lifting of the drive rollers of the sectors during the processing process, which will inevitably cause the sectors in front of the continuous casting machine (such as 1 #2#3# section) driving rollers not only can’t play the role of drawing in the drawing process, but will cause the increase of drawing resistance, which is not conducive to the smooth drawing of the slab

Another disadvantage is that, since the frictional resistances of the drive rollers of each sector are completely different during the process of processing stagnant billets, if all the drive rollers of the sector are involved in the drawing control without considering the difference, it will be There is a high probability that the drive roller drive handle will break when processing stagnant billets, and abnormal conditions such as drive roller failure will occur.

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