A Slab Submerged Nozzle for Suppressing Liquid Level Fluctuation

Abstract

A slab submerged nozzle that suppresses liquid level fluctuations. The nozzle body includes a sequentially connected cylindrical cavity, a diversion slope, an upper rectangular cavity, an isosceles trapezoidal cavity, and a lower rectangular cavity. The diversion slope is From the bottom surface of the cylindrical cavity to the top surface of the rectangular cavity, the diversion slope is symmetrically arranged, and the middle position of the bottom plate of the lower rectangular cavity is provided with a conical diversion prism with the same width as the lower rectangular cavity, and the lower rectangular cavity A two-hole type nozzle body slit outlet is arranged between the short side of the bottom plate and the short side of the side plate of the lower rectangular cavity. The nozzle body is made of refractory material. The beneficial effect is that the structure is simple, the preparation is easy, and the production cost is low; the hedging effect of the diversion slope reduces the impact kinetic energy of the molten steel, and can effectively suppress fluctuations in the liquid level.

Description

technical field [0001] The invention belongs to the field of casting technology, in particular to continuous casting technology. Background technique [0002] The slab submerged nozzle is a commonly used nozzle form in continuous casting technology. In order to reduce the impact kinetic energy of molten steel in the slab submerged nozzle and suppress liquid level fluctuations, there are two solutions in the prior art; one is to arrange a flow control pyramid structure at the bottom of the nozzle. The nozzle is made of refractory material, cylindrical in shape, open on the top and closed on the bottom, symmetrically distributed molten metal outlets are arranged at a certain distance from the bottom, and the flow control pyramid is arranged in the bottom groove. Through the combination of different groove depths, different numbers of corners of the flow control pyramid, pyramid height, pyramid bottom side length, bottom side angle and the shape of the flow groove carved on th...

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Problems solved by technology

[0003] The deficiency of the prior art lies in: the method of changing the outlet area of ​​the slab nozzle, when increasing the outlet area, the molten steel will not completely fill the outlet due to gravity, and the outlet area is not fully utilized, reducing the effect of liquid level fluctuations bad

The method of adding a device to reduce the kinetic energy of molten steel impact inside the slab nozzle, the internal structure of the device for reducing the kinetic energy of molten steel impact is complex, and it is easy to be blocked and washed during use, which increases the failure rate of the slab nozzle, thereby reducing continuous casting Production line efficiency and cycle time

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