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Tundish covering flux, preparation method of tundish covering flux and application method of tundish covering flux

A covering agent and tundish technology, which is applied in the field of smelting auxiliary raw materials, can solve the problems of molten steel oxygenation, air ingress, and inability to remove oxygen, so as to improve internal quality, avoid quality objections, and reduce inclusion defects.

Inactive Publication Date: 2013-09-04
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The ladle slag detection equipment fails, causing the ladle steel slag to enter the tundish molten steel, causing the molten steel to increase oxygen (the oxygen content in the ladle slag is high
[0005] 2. In the continuous casting process, poor protective pouring often occurs, causing air to enter the molten steel in the tundish, and oxygen dissolves into the molten steel to form inclusions, and the conventional tundish covering agent cannot remove the oxygen from the molten steel
[0007] Although the above research results can absorb the inclusions in molten steel to a certain extent, because the method of increasing the alkalinity of the covering agent is used to achieve the purpose of absorbing inclusions, it is easy to cause the viscosity of the covering agent to increase. Separated from the covering agent and enters the air
In addition, since this covering agent does not have a reducing function, it cannot remove dissolved oxygen in molten steel, that is, it cannot remove dissolved oxygen that has entered molten steel or covering agent
[0008] Obviously, the problems in the continuous casting process cannot be solved well only by the current tundish covering agent. Whether it is the failure of the ladle slag or the oxygenation of molten steel caused by the entry of molten steel into the air in the tundish, the conventional covering A reducing covering agent that cannot remove dissolved oxygen in molten steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Feeding:

[0031] Select low melting point pre-melted slag: its composition weight percentage and performance index are: CaO48%, Al 2 o 3 36%, SiO 2 5.0%, MgO5%, Fe 2 o 3 1.5%, free C1.0%, S≤0.10%, H 2 O≤2.0%; melting point of pre-slag≤1450℃, melting speed in 70-100s -1 , the bulk density is 0.8±0.2g / cm 3 . At the same time, the proportion of hollow particles in the low melting point pre-slag is: CaO25-35%, Al 2 o 3 15-25%, SiO 2 ≤15%, MgO≤15%, Fe 2 o 3 ≤2.0%, free C≤2%, S≤0.10%; the melting point of pre-melted slag hollow particles is 1250-1450℃, and the melting speed is 70-100s -1 , the bulk density is 0.75±0.2g / cm 3 . Process and sieve the selected low-melting point pre-melted slag into slag-shaped particles with a particle size of 0.5-1.0mm. And sieve the metal aluminum powder and calcium powder into particles with a particle size of 0.5-3mm for later use.

[0032] 2. Preparation:

[0033] Put 97% of sieved low melting point pre-slag, 1.5% of met...

Embodiment 2

[0037] 1. Feeding:

[0038] Select low melting point pre-melted slag: its composition weight percentage and performance index are: CaO46%, Al 2 o 3 35%, SiO 2 6.0%, MgO9.5%, Fe 2 o 3 1.0%, free C0.5%, S≤0.10%, H 2 O1.4%; pre-slag melting point ≤ 1450 ℃, melting speed in 70-100s -1 , the bulk density is 0.8±0.2g / cm 3 . At the same time, the proportion of hollow particles in the low melting point pre-slag is: CaO25-35%, Al 2 o 3 15-25%, SiO 2 ≤15%, MgO≤15%, Fe 2 o 3 ≤2.0%, free C≤2%, S≤0.10%; the melting point of pre-melted slag hollow particles is 1250-1450℃, and the melting speed is 70-100s -1 , the bulk density is 0.75±0.2g / cm 3 . Process and sieve the selected low-melting point pre-melted slag into slag-shaped particles with a particle size of 0.5-1.0mm. And the aluminum-calcium alloy powder composed of Ca35wt% and Al64wt% is sieved into particles with a particle size of 0.5-3mm for later use.

[0039] 2. Preparation:

[0040]Put 94% of the sieved low meltin...

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Abstract

The invention provides a tundish covering flux, a preparation of the tundish covering flux and an application method of the tundish covering flux. The tundish covering flux comprises, by weight percentage, 1.5-4.5 % of metal aluminum powder, 1.25-2.2 % calcium powder and 93-97% low-melting-point premelting slag. The preparation of the tundish covering flux is characterized by placing the metal aluminum powder, the calcium powder and the low-melting-point premelting slag which are extracted according to a ratio into a vertical type mixer for mixing for 1-3 hours; and placing the evenly-mixed covering flux mixture in a drying oven, and drying for 1-4 hours in nitrogen protective atmosphere and at a temperature of 50-70 DEG C. The application method of the tundish covering flux is characterized by respectively adding the covering flux at 0.1-0.2 kg per ton of steel after the pouring of a first pot of steel in casting is started and when the pouring of the first pot of steel is finished; and respectively adding the covering flux at 0.05-0.1 kg per ton of steel at the beginning of the pouring of every pot and at the end of the pouring of every pot. According to the tundish covering flux, the preparation of the tundish covering flux and the application method of the tundish covering flux, oxygen and nitrogen in the molten iron are reduced remarkably, the removal rate of ferrous oxide in steel reaches 11.49 %, the T.O reduction rate reaches more than 15%, the nitrogen reduction rate reaches 20%, therefore, the inclusion defect of a slab is greatly reduced, the inherent quality of rolled plate coil is improved, and the quality objection is avoided.

Description

technical field [0001] The invention belongs to the technical field of smelting auxiliary raw materials, in particular to a reducing covering agent used for tundishes in the continuous casting process. Background technique [0002] In the continuous casting process, it is necessary to add a covering agent on the surface of the molten steel in the tundish. Its function is to protect the molten steel from contact with the air, prevent the oxygen in the air from entering the molten steel and cause inclusions, and keep the molten steel warm to meet the requirements of the continuous casting molten steel. Pouring temperature needs, and at the same time, it can absorb inclusions in molten steel. [0003] However, in the current continuous casting process, there are often the following problems: [0004] 1. The ladle slag detection equipment fails, causing the ladle steel slag to enter the tundish molten steel, causing the molten steel to increase oxygen (the oxygen content in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/111
Inventor 费鹏王晓峰姚伟智张越林洋臧绍双
Owner ANGANG STEEL CO LTD
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