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Method for determining melting performance of crystallizer protection slag

A technology for mold flux and melting performance, which is applied in the investigation stage/state change and other directions, can solve the problems of not taking into account the changing characteristics of the mold flux during the melting process, not being comprehensive enough, and unfavorable for analyzing the surface defects of the casting billet, etc. Achieving great social and economic benefits, ensuring the quality of the casting billet, and high reliability

Inactive Publication Date: 2013-12-25
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the melting performance of the mold powder is judged mainly by detecting the melting temperature of the mold powder. This judgment method only analyzes the melting temperature of the mold powder, and does not take into account the shape change characteristics of the mold powder during the entire melting process. Therefore, Insufficient comprehensiveness, which is extremely unfavorable for analyzing the causes of slab surface defects and bonded breakouts

Method used

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  • Method for determining melting performance of crystallizer protection slag
  • Method for determining melting performance of crystallizer protection slag
  • Method for determining melting performance of crystallizer protection slag

Examples

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Embodiment 1

[0039] The mold flux in Example 1 is a mold flux used for continuous casting of high carbon steel. Sample preparation is carried out according to the method of the present invention, and its melting process and shape characteristics after melting are analyzed. Such as figure 2 Shown is the shape change process of the standard sample of the mold flux of Example 1 of the present invention during the heating process. From figure 2 It can be seen that with the increase of temperature, the shape change characteristic of the standard sample from the softening point to the flow point is uniform, that is, the shape change of the standard sample is stable and uniform, and the entire melting process is uniform. Such as image 3 Shown is the shape of the standard sample after the crystallizer mold flux of Example 1 of the present invention is melted and cooled. From image 3 It can be seen that the standard sample is a uniform circle after melting. According to the shape change c...

Embodiment 2

[0042] The mold flux in Example 2 is a mold flux for slab continuous casting production. Sample preparation is carried out according to the method of the present invention, and its melting process and shape characteristics after melting are analyzed. Such as Figure 4 Shown is the shape change process of the standard sample of the mold flux of Example 2 of the present invention during the heating process. From Figure 4 It can be seen that with the increase of temperature, the shape change of the standard sample from the softening point to the flow point is characterized by undulations, that is, the shape of the standard sample has been fluctuating, and the melting is not uniform throughout the process. Such as Figure 5 Shown is the shape of the standard sample after the crystallizer mold flux of Example 2 of the present invention has been melted and cooled. From Figure 5 It can be seen that the standard sample is uneven and non-circular after melting. According to the...

Embodiment 3

[0045]The mold powder of Example 3 is a mold powder for medium and low carbon continuous casting production. Sample preparation is carried out according to the method of the present invention, and its melting process and shape characteristics after melting are analyzed. As the temperature increases, the shape change of the standard sample from the softening point to the flow point is characterized by a uniform type, that is, the shape change of the standard sample is stable and uniform, and the entire melting process is uniform. The shape change process of the standard sample during the temperature rise process of the mold flux of embodiment 3 can be found in figure 2 . Such as Figure 6 Shown is the shape of the standard sample after the crystallizer mold flux of Example 3 of the present invention has been melted and cooled. After melting, the standard sample is uniform and circular. According to the shape change characteristics of the standard sample during the melting ...

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Abstract

The invention discloses a method for determining the melting performance of crystallizer protection slag. The method comprises the following steps: processing the crystallizer protection slag to prepare a standard sample; melting the standard sample, and observing the shape change characteristic of the standard sample in the melting process; cooling the standard sample to room temperature after the standard sample is completely molten, and observing the shape characteristic of the melt-down standard sample; and determining the melting performance of the crystallizer protection slag according to the shape change characteristic of the standard sample in the melting process and the shape characteristic of the melt-down standard sample. The melting performance of the crystallizer protection slag is comprehensively and accurately determined through the introduction of a slag shape characteristic concept, the detection of a melting temperature and the combination of the slag shape and the melt-down sample characteristic, so the method has a high reliability; and the method has a guiding effect on the onsite continuous casting production, can guarantee the smooth implementation of the continuous casting and the casting blank quality, and has large social and economic benefits.

Description

technical field [0001] The invention relates to the technical field of continuous casting mold flux, in particular to a method for judging the melting performance of mold flux. Background technique [0002] In the process of continuous casting, the physical and chemical properties of mold flux directly affect the stable production of continuous casting and the quality and output of slab. The mold powder added to the mold must have appropriate physical and chemical properties in order to give full play to its five metallurgical functions: covering heat preservation, preventing secondary oxidation, absorbing inclusions, lubricating between the mold and the slab, and improving the mold and slab heat transfer between. The two most important metallurgical functions are "lubrication" and "controlling heat transfer". The good performance of these two functions is achieved by the good melting performance of mold slag. The melting performance of mold slag added to the mold is not go...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N25/02
Inventor 王爱兰张怀军陈建新韩春鹏孟保仓
Owner INNER MONGOLIA BAOTOU STEEL UNION
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