Method for judging flow field bias in crystallizer

Abstract

The invention relates to a method for judging flow field bias in a crystallizer. The method comprises the following steps that 1) the sizes of flames on two narrow sides of the crystallizer are compared, if the flames on one side is larger than the flames on the other side and the situation lasts, crystallizer flow field bias occurs; (2) the thickness of slag layers of casting powder is measured, and if the thickness difference of the slag layers on the two sides exceeds 2mm, the crystallizer flow field bias occurs; and (3) a casting blank with a fixed meter is poured and compared, and if the casting powder on one side of a nozzle is pushed more than the casting powder on the other side, the crystallizer flow field bias occurs. According to the method, the change of a flow field in the crystallizer can be mastered at any time, whether the flow field is biased can be judged in time, an accurate judgment basis is provided for replacing a submersed nozzle in time, the influence of the bias on the cleanliness of molten steel is avoided, and meanwhile, a bleed-out accident caused by poor inflow of casting powder can be effectively avoided.

Description

technical field [0001] The invention relates to the field of continuous steel casting, in particular to a method for distinguishing flow field deviation in a crystallizer during molten steel pouring. Background technique [0002] After the molten steel is processed by the refining furnace, it is lifted to the front of the machine by a crane and sits on the ladle turret. Open the slide plate of the molten steel tank through the oil cylinder, the molten steel enters the tundish through the long nozzle, and the molten steel in the tundish enters the crystallizer through the submerged nozzle. After the molten steel passes through the outlet holes on both sides of the bottom of the submerged nozzle, a symmetrical double-return flow field is formed in the mold, which is conducive to the melting of mold slag in the mold, which can effectively prevent cold steel at the meniscus and is beneficial to the steel Floating of inclusions. [0003] In order to improve the protective pouri...

AI Technical Summary

Problems solved by technology

On the side where the strands are strong, the steel flow can easily hit the narrow side of the slab, and the inclusions in the steel cannot be floated up in time and will be captured by the slab shell, increasing the probability of inclusion defects; on the side where the strands are weak, the melting effect of mold slag become worse, the meniscus of the crystallizer is prone to cold steel phenomenon, the flow of mold slag becomes worse, the probability of longitudinal crack defects in the slab and the risk of steel breakout increase