SU1754322A1 - Continuous casting nozzle - Google Patents

Abstract

This invention relates to metallurgy, specifically to the continuous casting of metals. The essence of the invention: on the inner surface of the channel of the cup (C) there is a screw groove with a step of 0.3-0.5 of height C, a depth of 0.3-0.5, and a width of 1.0-2.5 of wall thickness C. 1 ill.

Description

This invention relates to metallurgy, specifically to the continuous casting of metals.

The purpose of the invention is to improve the quality of the cast ingot due to the improvement of the surface and macrostructure,

The drawing shows the proposed glass.

The continuous casting glass includes a housing 1, on the inner surface of which screw channels 2 are made. The channel pitch (h) is 0.3-0.5 of the height of the casing, the depth of the channel (a) is 0.3-0.5 of the thickness of the casing ( d), and the width of the channel (b) is 1.0-2.5 of the thickness of the body (d).

Glass works as follows.

The liquid metal from the tundish enters the immersion refractory cup, in which the passage through the screw channels twists, driving the entire mass of metal at the outlet of the cup into the mold in a directional circular motion. By inertia, this movement continues throughout the volume of the mold. This allows the leaching of non-metallic inclusions and gas bubbles from under the cortical zone of the ingot, and also improves the macrostructure of the crystallizing ingot.

Such an embodiment of the channels leads to the fact that the metal stream, having flowed out from the tundish and the passage through the screw channels of the glass, is twisted, drawing by inertia into a circular motion the liquid metal in the crystallizer. As a result of the directional movement of the liquid metal, gas bubbles and nonmetallic inclusions are flushed out from the solidification front, which leads to an improvement in the quality of the surface and the subsurface zone of the ingot, in which there are a small number of macroscopic inclusions.

Making the channels with a twist pitch of less than 0.3 of the height of the body of the cup makes it harder to make the glass, and more than 0.5 of the height of the body of the cup reduces the effect of the curl of the metal jet. When the channel depth is less than 0.3, and the width is less than 1.0, the thickness of the wall of the cup body decreases the portion of metal involved in the rotational motion, thereby reducing the twisting effect. Increasing the channel depth is greater than 0.5, and the width

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more than 2.5 thickness of the wall of the glass significantly reduces the strength of the body of the glass

The optimal design of the glass has channels with 2-4 visits.

The present invention makes it possible to fulfill the role of equipment for the electromagnetic mixing of a liquid metal in a crystallizer with a similar effect on improving the quality of the ingot, namely:

the number of ingots with a defective surface due to a decrease in non-metallic inclusions and cortical blisters is reduced by 2/3 compared with casting through an ordinary glass;

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the number of ingots with defect index O or 1 increases to 85-93% compared to 50-55% for casting using conventional glass

Claims (1)

Claims for continuous casting, made with a screw groove on its inner surface, characterized in that, in order to improve the quality of the cast ingot by improving the surface and macrostructure, the screw groove is made with a pitch equal to 0.3-0.5 cup height depth of 0.3-0.5 and a width of 1.0-2.5 thickness of the glass.