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Covering agent for preventing tundish from being melted and damaged and application

A covering agent and tundish technology, which is applied in the application field of continuous casting auxiliary materials, can solve the problems of inability to prevent the erosion of the tundish coating and insufficient adsorption capacity, so as to reduce the abnormal opening and casting, solve the problem of melting damage, and stabilize the continuous casting. Effect

Active Publication Date: 2019-10-11
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One of the main problems is the insufficient adsorption capacity and most critically, the inability to prevent the erosion of the tundish coating

Method used

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  • Covering agent for preventing tundish from being melted and damaged and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The covering agent for preventing tundish melt damage is produced according to the technical plan and the important components of the ingredients in the technical description.

[0037] 1. Prepare the premelt. According to 58% CaO, 22% Al 2 o 3 , 10% MgO, 8% SiO 2 And 2% C to carry out the proportioning of composition. Among them, CaO and Al 2 o 3 Wollastonite can be used as an incoming material source.

[0038] 2. Prepare magnesia. Using magnesite, the sintering temperature is controlled at 700-950 degrees, and the main component of MgO with a purity of more than 95% is prepared, which is used as the adsorbate of the premelted material in the tundish. The mixing mass ratio of premelt and magnesia is 5:1.

[0039] 3. Mechanically mix the premelted material prepared above with magnesia to form a tundish covering agent for preventing erosion of the tundish.

[0040] Before use, the depth of melting damage in the tundish can reach 20mm-30mm. After the implementatio...

Embodiment 2

[0042] 1. Prepare the premelt. According to 55% CaO, 24% Al 2 o 3 , 11% MgO, and 7.5% SiO 2 , 2.5% C for the proportioning of ingredients. Among them, CaO and Al2O3 can use wollastonite as the source of incoming materials.

[0043] 2. Prepare magnesia. Using magnesite, the sintering temperature is controlled at 700-950 degrees, and the main component of MgO with a purity of more than 95% is prepared, which is used as the adsorbate of the premelted material in the tundish. The mixing mass ratio of premelt and magnesia is 6:1.

[0044] 3. Mechanically mix the premelted material prepared above with magnesia to form a tundish covering agent for preventing erosion of the tundish.

[0045]Before use, the depth of melting damage in the tundish can reach 20mm-30mm. After the implementation, the depth is basically within 2mm, which basically solves the problem of melting damage.

Embodiment 3

[0047] 1. Prepare the premelt. According to 52.5% CaO, 23% Al 2 o 3 , 11% MgO, and 10% SiO 2 , 3.5% of C for the ratio of ingredients. Among them, CaO and Al2O3 can use wollastonite as the source of incoming materials.

[0048] 2. Prepare magnesia. Using magnesite, the sintering temperature is controlled at 700-950 degrees, and the main component of MgO with a purity of more than 95% is prepared, which is used as the adsorbate of the premelted material in the tundish. The mixing mass ratio of premelt and magnesia is 3:1.

[0049] 3. Mechanically mix the premelted material prepared above with magnesia to form a tundish covering agent for preventing erosion of the tundish.

[0050] Before use, the depth of melting damage in the tundish can reach 20mm-30mm. After the implementation, the depth is basically within 2mm, which basically solves the problem of melting damage.

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Abstract

The invention provides a covering agent for preventing a tundish from being melted and damaged, and the covering agent comprises a premelting material and an adsorbate. The premelting material comprises, by weight, 50-65% of CaO, 20-31% of Al2O3, 10-18% of MgO, 7.5-12.5% of SiO2, 2.5-3% of C; the melting point is 1300-1450 DEG C; and the mass ratio of the premelting material to the adsorbate is 5-6:1-2. The covering agent for preventing the tundish from being melted and damaged, provided by the invention, can be widely applied to the production process in continuous casting steel, reduces casting abnormality and has the characteristic of stable continuous casting. The covering agent for preventing the tundish from being melted and damaged can effectively prevent the tundish coating from being melted and damaged. Before the technical scheme of the invention is adopted, the depth of the melting and damage of the tundish can reach 20 mm-30 mm; and the depth is basically within 2 mm afterthe implementation of the technical scheme, and the problem of the melting and damage is basically solved.

Description

technical field [0001] The invention relates to the application field of continuous casting auxiliary materials in continuous casting steel machines, in particular to the covering agent used in the continuous casting steel pouring process. Background technique [0002] In the continuous casting process, the role of the covering agent is to prevent oxidation and to absorb the inclusions of molten steel. The main component of the adsorption is CAO to complete. [0003] Publication (announcement) number: CN103111592A, tundish covering agent, covering agent comprises 40%-50% CaO, 25%-35% Al2O3, 1%-8% MgO, less than 5% SiO2, 1%-10% of CaF2, 1%-5% of Na2O and the balance of unavoidable impurities. In this patent, the MgO content is too low, and the erosion of the tundish coating is prone to occur. Moreover, there is a low-melting-point substance such as CaF2, which is more prone to melting loss of the coating. [0004] Publication (announcement) No. CN103372636A, a double-laye...

Claims

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Application Information

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IPC IPC(8): B22D11/111
CPCB22D11/111
Inventor 赵显久吴杰姜立新唐惠中
Owner BAOSHAN IRON & STEEL CO LTD
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