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Molten steel covering agent and its preparation method

A covering agent and molten steel technology, applied in the direction of improving process efficiency, etc., can solve problems such as deterioration of steel quality and inability to realize metallurgical functions, and achieve the effect of eliminating the danger of deterioration of steel quality

Inactive Publication Date: 2008-02-27
LIAONING TIANHE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the basic carbon-free covering agent produced by the above process not only cannot realize the expected metallurgical function, but also has the danger of deteriorating the steel quality

Method used

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  • Molten steel covering agent and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The molten steel covering agent of the present invention was compared with Comparative Example 1 and Comparative Example 2 in a tundish with a capacity of 30 tons. Casting ultra-low carbon steel with carbon content less than or equal to 50ppm, the tundish lining is made of MgO paint, and the stopper rod is made of MgO-Cr 2 o 3 The chemical composition and performance of each covering agent are shown in Table 1. The preparation process of each covering agent is:

[0042] Embodiment 1 The preparation process of the covering agent is: the preparation process of the carbon-free alkaline foamed steel molten steel covering agent of the present invention, that is: weighing ingredients→preparing mother liquor→pulping→forming→drying→crushing→sieving→inspecting packaging and use.

Embodiment 2

[0049] In a steel ladle with a capacity of 50 tons, the molten steel covering agent of the present invention and Comparative Example 3 were compared and verified (see Table 1 for components and properties).

[0050] The carbon content of molten steel is (weight%) 0.02-0.06. The preparation process of the covering agent of Example 2 is the same as that of the covering agent of Example 1, and the preparation process of the covering agent of Comparative Example 3 is the same as that of the covering agent of Comparative Example 2. The dosage of each covering agent is 0.15Kg / T steel, and after the molten steel is refined, they are added to the ladle steel surface at one time. There is no carburization phenomenon when using the covering agent of Example 2, and the carbon content of molten steel using the covering agent of Comparative Example 3 increases (% by weight) by 0.015.

[0051] Table 1

[0052] Example 1

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Abstract

The present invention is molten steel covering agent and its preparation process. The molten steel covering agent consists of Na2O 1-8 wt%, F- 0-7 wt%, Al2O3 3-40 wt%, CaO 5-40 wt%, Fe2O3 0-2 wt%, foaming agent 0.5-10 wt%, adhesive 1-20 wt% except MgO and SiO2, where the weight ratio (CaO+MgO) / SiO2 is 2-10. The molten steel covering agent is porous grains of grain size 0.1-15 mm. Its preparation process includes the following steps: mixing foaming agent, adhesive and water in a stirring vessel to prepare liquid; mixing the liquid and other components through mechanical stirring to form slurry; forming, drying, crushing and sieving. The molten steel covering agent is used in covering molten steel in ladle and possesses the metallurgical functions of maintaining heat, absorbing impurity, avoiding carburization of molten steel, etc.

Description

technical field [0001] The invention relates to a covering agent added to the surface of molten steel in ladles and tundishes. Background technique [0002] During the transportation of molten steel from the steelmaking furnace to the continuous casting machine, a series of metallurgical reactions must be carried out in the ladle and tundish. In order to realize different metallurgical functions, corresponding reaction slag agents are often used. For example, in order to improve the cleanliness of molten steel (such as reducing [S], [P] and inclusion content), refining slag is often added to the ladle; when arc heating (LF furnace) is used in the ladle, foam slag is used to reduce arc damage. Radiation of the lining and capping, the main function of all these slag agents is to enhance the refining process. However, to prevent severe temperature drop in the molten steel transportation process and casting process, it is necessary to add a covering agent with thermal insulatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D1/00C21C7/076
CPCY02P10/20
Inventor 王谦杨颖何生平
Owner LIAONING TIANHE TECH
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