A method for distributing mold slag in a single-point unbalanced casting special-shaped billet mold

Abstract

The invention discloses a method for distributing casting powders on a single-point non-equilibrium casting profiled blank crystallizer, belonging to the technical field of continuous casting crystallizers. The method comprises the following steps: obtaining a single-point casting model of the crystallizer through mathematical modeling; simulating the mathematical model after mathematical modeling, to obtain the temperature distribution of molten steel at the cross section of the crystallizer in single-point casting; determining seven adding points of the casting powders according to the temperature distribution of the cross section of the crystallizer; selecting two casting powders with different melting points; and after the molten steel level of the crystallizer exceeds the bottom of asubmerged nozzle, starting adding the casting powders. The method can solve the problems of uneven temperature distribution of the casting liquid surface, large temperature difference of the casting cross section, large melting amount of the casting powders in the high temperature area, large liquid slag proportion and unstable casting powder layer when single point casting is carried out, makes the crystallizer casting powders dissolve evenly, obtains a good casting powder layer, and has the advantages of reasonable design and easy realization.

Description

technical field [0001] The invention belongs to the technical field of continuous casting crystallizers, and more specifically relates to a mold slag distributing method for a single-point unbalanced casting shaped billet mold. Background technique [0002] Continuous casting mold powder is mainly composed of three parts: base material, flux and carbonaceous material, and its main chemical components are CaO, SiO 2 、Na 2 O, CaF 2 、Al 2 o 3 , MgO, etc. As the key auxiliary material of continuous casting mold mold slag, it is required to have thermal insulation coverage (to prevent secondary oxidation of molten steel), absorb and assimilate floating inclusions in molten steel, and improve heat transfer between billet and mold Effect and reduce the friction between the two (to ensure the lubrication of the slab) and other functions. [0003] The above functions are determined by the characteristics of the mold flux, and the melting point of the mold flux is one of the imp...

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Problems solved by technology

[0010] Aiming at the problems of uneven mold flux dissolution and unstable mold flux layer due to the large difference in mold surface temperature caused by the existing single-point casting of special-shaped billets, the present invention provides a single-point unbalanced casting special-shaped billet mold Mold slag distribution method, which can adapt to the irregular shape of the shaped billet mold, and when performing single-point casting, the temperature distribution of the casting liquid surface is uneven, the temperature difference of the casting section is large, and the melting amount of the mold slag in the high temperature area is large, so that the proportion of liquid slag is large and The problem of unstable mold slag layer can make the mold mold slag dissolve evenly, obtain a good mold slag layer, play a good role in lubrication during the drawing process, reduce drawing resistance, and prevent drawing leakage

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