Submerged entry nozzle for continuous casting

Abstract

This invention provides a submerged entry nozzle for continuous casting which has the optimized nozzle inner shape and is formed in a median strip shape to prevent stagnation region of molten steel from being produced in the nozzle, reduce height difference according to fluctuation of the surface level of molten steel and produce a good quality casting slab having uniform thickness of solidified shell. The submerged entry nozzle for continuous casting comprises: an upper part(31) which is equipped with a refractory material(30) having a convergent inlet(30a), a rest part of which is connected to the inlet to form a slot shaped cross-sectional flow path such that distance(e) between narrow faces of the flow path is long as a whole, distance between wide faces of the flow path is short, and cross sectional area of the flow path is not changed; a conversion part(32) which is connected to the upper part such that thickness of the wall surface of the nozzle is gradually thinned as it goes from the upper part side to the exit side and comprises a slot shaped cross-sectional flow path such that distance between narrow faces of the flow path is gradually increased, distance between wide faces of the flow path is reduced, and cross sectional area of the flow path is not changed; and a lower part(33) which is connected to the conversion part such that thickness of the wall surface of the nozzle is hardly changed as it goes from the conversion part side to the exit side, and in which distance between narrow faces of the flow path is slowly increased, wherein discharge ports(35,36) for guiding flow of molten steel into a mold are installed at an end part of the lower part such that the discharge ports are in the symmetrical state by a separation member(34).

Description

technical field [0001] The present invention relates to a submerged nozzle for continuous casting, in particular to a submerged nozzle for supplying molten metal to a mold without a sudden change in flow velocity, so as to guide the uniform distribution of the molten metal flowing out from the submerged nozzle and ensure solidification of the unit cell Uniform thickness yields high-quality castings. Background technique [0002] Generally, continuous casting is continuously pouring molten metal into a mold with an open bottom to continuously pull out the casting as the molten metal solidifies, which is used to produce long shapes with simple cross-sections such as square, rectangular, circular, etc. Products and plates, ingots and billets. [0003] Continuous casting is carried out by means of a continuous casting machine provided with a tundish, a casting mold, a secondary cooling rack, pinch rollers and a cutter. [0004] In particular, the tundish receives molten metal ...

AI Technical Summary

Problems solved by technology

[0033] In particular, even if the pressure wave sent to the upper part is weakened at the inlet of the nozzle, since the pressure wave sent to the lower part pulsates, the flow rate and outflow rate are not uniform, so it is difficult to keep the surface S0 of the molten metal in the mold constant

Moreover, non-uniform flow is also produced by the difference in flow velocity

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