Plate blank submersed nozzle capable of inhibiting liquid level fluctuation

Abstract

The invention discloses a plate blank submersed nozzle capable of inhibiting liquid level fluctuation. A nozzle cavity comprises a cylindrical cavity, flow guide inclined faces, an upper rectangular cavity, an isosceles trapezoid cavity and a lower rectangular cavity, all of which are sequentially connected, the flow guide inclined faces are faces transited from the bottom face of the cylindricalcavity to the top face of the upper rectangular cavity, the flow guide inclined faces are symmetrically arranged, a conical flow guide prism with the same width as the lower rectangular cavity is arranged at the middle position of a bottom plate of the lower rectangular cavity, and a two-hole type nozzle cavity narrow slit outlet is formed between the short edge of the bottom plate of the lower rectangular cavity and the short edge of a side plate of the lower rectangular cavity. The nozzle cavity is made of a refractory material. The plate blank submersed nozzle has the beneficial effects that the structure is simple, preparation is easy, and the production cost is low; and by means of the hedging effect of the flow guide inclined faces, the impact kinetic energy of molten steel is reduced, and liquid level fluctuation can be effectively inhibited.

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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