Flow control device for tundish of slab continuous caster and deslagging method thereof

Abstract

The invention relates to a flow control device for a tundish of a slab continuous caster and manufacturing method thereof. The flow control device comprises a turbulent flow controller, a slag weir and a slag dam, wherein the upper edge of the slag weir is higher than the normally poured liquid steel highest liquid surface of the tundish but lower than the working surface of overflow port coating materials of the tundish, the slag weir and the slag dam are arranged in vertically staggered mode, and a through hole is respectively arranged at two ends of the slag dam. The centre distance a between the slag weir and the turbulent flow controller is 400-600mm, the centre distance b between the slag dam and the slag weir is 300-400mm, and the distance y between the working surface of overflow port coating materials of the tundish and the edge of the tundish is 120-160mm. The turbulent flow controller is of a structure made of combined composite materials, and the slag weir and the slag dam is respectively formed by molded pouring materials through casting molding in the intermediate temperate sintering process. By aid of the flow control device, injection residues of the tundish of slabs are reduced by more than 25% on year-on-year basis, service life of the flow control device is prolonged by one time on year-on-year basis, and continuous casting refractory material production cost is reduced by more than 30% on year-on-year basis.

Description

technical field [0001] The invention relates to a flow control device for a tundish of a slab continuous casting machine and a preparation method thereof, belonging to the technical field of iron and steel metallurgy slab continuous casting tundish technology. Background technique [0002] A flow control device is installed in the tundish of the slab continuous casting machine to change the running route of molten steel, prolong the residence time of molten steel in the tundish, and has the metallurgical function of promoting the floating and removal of inclusions, reducing inclusions inside the slab, and changing the shape of inclusions . The flow control device is generally composed of a turbulence controller, a slag retaining weir, and a slag retaining dam. At present, after the flow control device is installed in the tundish of the slab continuous casting machine, there are new technical problems: (1) The slag retaining weir is installed, and the steel slag floating in ...

AI Technical Summary

Problems solved by technology

At present, after the flow control device is installed in the tundish of the slab continuous casting machine, there are new technical problems: (1) The slag retaining weir is installed, and the steel slag floating in the tundish cannot be discharged regularly through the tundish overflow port. It can shorten the continuous pouring time of the tundish, resulting in an increase in the production cost of continuous casting; (2) Set up a slag dam to block part of the molten steel from flowing out after the tundish stops pouring, thereby increasing the excess of the tundish and reducing the slab (3) The flow control device is not resistant to erosion and erosion, and its service life is low, which has become a bottleneck problem that restricts the improvement of the life of the slab continuous casting tundish, resulting in an increase in continuous casting production costs

Defects of this invention: 1) The upper edge of the slag retaining weir is flush with the edge of the tundish, and the steel slag floating in the tundish cannot be discharged regularly through the tundish overflow port, and the continuous pouring time of the tundish can only be shortened , generally less than 8 hours; 2) There is no through hole on the slag retaining dam. After the tundish stops pouring, part of the molten steel is blocked from flowing out, thereby increasing the tundish injection surplus; the slag retaining dam adopts the existing production technology, and its resistance to molten steel Erosion and scouring performance are poor, and the service life is generally less than 8 hours; 3) The bottom of the tundish where the molten steel is injected into the tundish adopts a traditional impact pad without a turbulence controller, which is beneficial to prolonging the residence time of molten steel in the tundish and promoting The effect of floating and removing inclusions is greatly weakened, and the impact pad resists molten steel erosion and has poor scouring performance, and its service life is generally less than 10 hours

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