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

A mold powder and mold powder technology, which is applied in the field of continuous casting mold, can solve the problems of excessive temperature difference, unstable mold powder layer, and uneven dissolution of mold powder, so as to reduce melting point and reduce billet drawing resistance. , The effect of preventing steel leakage

Active Publication Date: 2020-08-07
LAIWU STEEL YINSHAN SECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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

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Embodiment 1

[0045] A method for distributing mold slag in a single-point unbalanced casting shaped billet crystallizer according to the present invention mainly includes the following steps:

[0046] A. Obtain the model of crystallizer single-point casting through mathematical modeling; figure 1 As shown, it is a top view of the working area of ​​the crystallizer for mathematical modeling. Mathematical modeling does not need to enter the site to measure the production, and in the continuous casting process, it is dangerous and expensive to use instruments to detect the condition of molten steel. It is beneficial to reduce production costs. After the numerical simulation analyzes the on-site production, it conducts mathematical modeling. The simulation results are close to the actual situation, which has certain guiding significance for actual production.

[0047] B. Simulate the mathematical model that has been modeled to obtain the temperature distribution of molten steel on the cross-se...

Embodiment 2

[0057] The steps of this embodiment are the same as that of Embodiment 1, the difference lies in further explaining the present invention and providing support for the present invention.

[0058] The mold flux of the present invention is composed of acidic oxides, basic oxides and fluorides, and carbon black is added to the mold flux as a covering agent. Since the melting point of carbon black is too high, it does not participate in the melting during the whole process, so it can be ignored Into the range of mold flux components, when adding mold flux initially, it can be added according to the proportion, and then it can be added according to the content of carbon black in the crystallizer as the case may be. Fluoride can be CaF 2 , for effectively lowering the melting point, adding CaF to No. ① mold flux and No. ② mold flux 2 The content is the same or similar, which is convenient for the calculation of the melting point of the two mold fluxes.

[0059] In order to facilit...

Embodiment 3

[0070] The procedure of this embodiment is the same as that of Example 2, the difference is that in step D, two compositions of mold flux with different contents and basicity of mold flux are provided.

[0071] Step D. Select two kinds of mold fluxes with different melting points, which are recorded as No. ① mold flux and No. ② mold flux. The melting point of No. ① mold flux is not lower than the melting point of No. ② mold flux; The number is SiO 2 : 32.3 parts, Al 2 o 3 : 18.6 parts, Fe 2 o 3 : 2.0 parts, CaO: 40.8 parts, MgO: 3.4 parts, R 2 O: 2.9 parts; The main component of No. ② mold flux is SiO in parts by weight 2 : 32.3 parts, Al 2 o 3 : 15.9 parts, Fe 2 o 3 : 2.0 parts, CaO: 40.8 parts, MgO: 3.4 parts, R 2 O: 5.6 parts. Add 1.8 parts of CaF to No. ① mold flux and No. ② mold flux according to the weight of the main components 2 and 14.8 parts of carbon black; the basicity R of No. ① mold slag is 0.89, and the basicity R of No. ② mold slag is 0.99.

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/108B22D11/111B22D11/18
CPCB22D11/108B22D11/111B22D11/182
Inventor 李四军王中学何飞彭永香杜金科韩蕾蕾郭达周俐常立忠王海军
Owner LAIWU STEEL YINSHAN SECTION CO LTD
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