Flat blank continuous casting closed-top technology for preventing steel liquid roof-falling

A technology for slab continuous casting and molten steel, which is applied in the field of casting technology of straight arc continuous casting machines, can solve the problems of low pulling speed, long time, high temperature of the tail casting billet, and reduced productivity.

Inactive Publication Date: 2007-10-17
WUHAN IRON & STEEL (GROUP) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is mainly manifested in the following two aspects: 1) The deceleration range is too large, and the dynamic light reduction area moves to the front end during deceleration. In order to ensure the surface temperature of the billet, the dynamic secondary cooling model cannot increase greatly in a short time. The amount of cooling water, and the tail adopts the method of heat preservation and capping, resulting in the high temperature of the billet at the tail, the empty shell is not long enough, and ther

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  • Flat blank continuous casting closed-top technology for preventing steel liquid roof-falling

Examples

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Embodiment 1

[0011] Example 1 The cast steel type is peritectic steel, the normal weight of the tundish is 30 tons, and the conventional casting speed is 1.0 m / min (marked A in the figure).

[0012] After the last furnace ladle is poured, when there is only 10t of molten steel left in the tundish, reduce the speed to 0.8m / min, and keep casting for 2 minutes (marked B in the figure), and then the captain will pull the casting speed to 0.3m / min , drive away the tundish car, maintain the pulling speed at 0.3m / min (mark C in the figure), remove the residue strips and water breaks on the molten steel surface in the crystallizer, and use a long oxygen pipe to fully stir the steel along the side. Liquid surface, after stirring, the length of the empty blank shell at the liquid surface must be ≥ 100mm, and then water cooling is carried out. During this period, the time is 3 minutes, and then the speed is increased to 1.2m / min (D mark in the figure) to pull the tail blank .

Embodiment 2

[0013] Example 2 The casting steel is weakly deoxidized steel, the normal weight of the tundish is 50 tons, and the typical casting speed is 1.4m / min.

[0014] After pouring the last furnace of ladle, when there is only 16 tons of molten steel left in the tundish, reduce the speed to 1.2m / min and keep casting for 3 minutes, then the captain will reduce the casting speed to 0.4m / min, drive away the tundish car, Maintain a casting speed of 0.4m / min, remove the residue strips and water breaks on the molten steel surface in the mold, insert 2 kg of aluminum strips into the molten steel in the mold, and use a long oxygen tube to fully stir the molten steel surface along the side, stirring After the completion, the length of the empty billet shell at the liquid level is guaranteed to be more than 100mm, and then it is cooled with water. The time during this period is 3 minutes, and then the speed is increased to 1.6m / min to pull the tail billet.

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Abstract

A slab continuous casting capping process for preventing molten steel from badly bleeding relates to a continuous casting field for smelting, comprises: section decelerating, adding with aluminum bar and raising speed of tailing slab. The section decelerating after bale pouring is to prevent decelerating too fast in final period and too large of the forward-shift in cogging region, thus it has no time to form the slab shell. Agitating oxygen pipe and water drilling for cooling are to ensure the empty slab shell have enough length so that the molten steel moving upwards has enough space. In order to continue desoxy a wild molten steel and prevent rising caused by tail part ebullition, 1-2 kilogram aluminum bar is inserted into open steel. During the final period, drawing tailing slab is carried out by raising speed to a speed higher than that of 0.2-0.3m/min during generally drawing strips, when the speed is too low, defects such as crack,etc., may appear, while the speed is too high, badly bleeding of the molten steel may occurs. The advantages of the invention are in that industrial accident of badly bleeding of the molten steel in the final period of the slab continuous casting process so that incidence rate of the molten steel badly bleeding can be reduced from 5 times/month to 0 time/month, meanwhile, incidence rate of tailing slab transverse crack during pouring peritectic steel and alloy steel can be reduced to 50% or more.

Description

technical field [0001] The invention relates to the technical field of smelting and continuous casting, in particular to a casting process for a straight arc continuous casting machine which applies a dynamic soft reduction technology and a dynamic secondary cooling technology to continuous casting slabs. Background technique [0002] Anyone engaged in smelting technology knows very well that the slab capping process is an important part of the continuous casting process, which is the process of treating the molten steel in the crystallizer at the end of continuous casting. Before the present invention was proposed, the main operation process of the existing technology was as follows: when the last furnace molten steel ladle was poured and the weight of the tundish molten steel dropped to about 4 tons, the continuous casting machine operator directly reduced the casting speed to 0.3- 0.4m / min, inform the control room personnel to change the water dis...

Claims

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Application Information

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IPC IPC(8): B22D11/18
Inventor 陈清泉李具中刘光明宋泽启陈国威邓品团吴强
Owner WUHAN IRON & STEEL (GROUP) CORP
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