Immersion nozzle for casting central point of ultrathin special-shaped blank

Abstract

The invention discloses an immersion nozzle for casting a central point of an ultrathin special-shaped blank, and belongs to the technical field of continuous casting of special-shaped blanks. The immersion nozzle comprises an immersion nozzle body, wherein the immersion nozzle body comprises a vertical section and a horizontal section, the vertical section and the central position of the horizontal section are integrally connected, the vertical section comprises a bowl part and an equal-diameter section, the bowl part is positioned at the upper end of the equal-diameter section, the inner cross section of the equal-diameter section is oval, and the long axis of the oval cross section is parallel to the central line of the horizontal section; the inner diameters of the horizontal section are equal and are symmetrical about the symmetrical surface of the vertical section, the shape of the inner vertical section is elliptic, the elliptic section is parallel to the central line of the vertical section, and through holes are arranged at the two ends of the horizontal section; and at least two downward inclined water holes are symmetrically arranged at the bottom end of the horizontal section. The structure of the immersion nozzle can be optimized, the temperature field and the flow field in the mold are stable, the flowing uniformity of molten steel is improved, the defects causedby continuous casting are reduced, the quality of ultra-thin special-shaped blank continuous casting is improved, and the immersion nozzle has the advantages of simple structure, reasonable design andeasiness in manufacturing.

Description

technical field [0001] The invention relates to the technical field of continuous casting of special-shaped billets, in particular to an ultra-thin special-shaped billet central point casting submerged nozzle. Background technique [0002] Since the 1950s, the continuous casting method in which molten steel is gradually solidified and directly produced by a tension leveler has become popular. In addition to the production of ordinary billets, blooms, and slabs, continuous casting and rolling I-shaped steel castings have also appeared. Liang's vision, at the same time put forward the concept of "shaped blank". After continuous experimental exploration and on-site practice, the world's first I-shaped billet continuous casting machine was built and put into production by SMS Demark (formerly Comcast) in Lake Ontario, Canada in 1968. Subsequently, profiled billet continuous casting machines were built and put into production in several Japanese steel companies. At the end of t...

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problem that in the casting process of the existing submerged nozzle, due to the limitation of the web thickness of the ultra-thin profiled billet crystallizer, there are many defects in the ultra-thin profiled billet, which affects the qualified rate, the invention provides an ultra-thin profiled billet single Point casting submerged nozzle, optimizing the structure of submerged nozzle, making the temperature field and flow field inside the crystallizer relatively stable, improving the uniformity of molten steel flow, reducing or eliminating the drift phenomenon, reducing casting defects in continuous casting, and improving Quality of Continuous Casting of Ultra-thin Profiled Billet

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