Method for replacing tundish of crystallizer at high liquid level

A tundish and mold technology, which is applied in the field of steelmaking, can solve the problems of mold hanging, broken steel at the joint, and large amount of traces in the casting billet, so as to eliminate the broken steel at the joint and improve the yield of molten steel. The effect of reducing the cutting rate and reducing the amount of cutting waste

Active Publication Date: 2011-10-19
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Using this method of operation not only has a large amount of traces on the slab, but also is prone to accidents such as crystallizer hang-ups, pull-offs at the joints, and other accidents during the casting process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0006] Example: The straight arc continuous casting machine is designed as a 900mm long straight copper plate mold. When the high liquid level of the mold replaces the tundish, the liquid steel surface is 50mm away from the top of the copper plate (at this time, the actual height of the molten steel in the mold is 850mm) . The specific implementation steps are as follows:

[0007] (1) Before planning to replace the tundish, it must first be confirmed that it will be replaced at the same time as the large bale to avoid large bale drainage accidents;

[0008] (2) After the hydraulic oil pipe is connected, the large contractor operates the rotating tower to rotate at an angle of 45 degrees, and the rotating tower rises to the highest position;

[0009] (3) The old tundish normally lowers the pulling speed and hits the blind plate. While driving away the old tundish, stop the machine immediately and ensure that the liquid level in the crystallizer is about 50mm away from the uppe...

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PUM

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Abstract

The invention provides a method for replacing tundish of a crystallizer at high liquid level, belonging to the field of steel-making. Before the tundish is replaced in a continuous casting way, the molten steel in the crystallizer is lifted up to the position of 50mm at the upper edge of a crystallizer copper plate; when the pouring is started, the initial pulling speed is 0.4m/min; within 1.5 minutes after starting, the slag skin is removed and the liquid surface is stabilized; subsequently the pulling speed is promoted to 0.1m/min at the increment of 0.1m/min per 20 seconds; within 30 seconds, the thickness of the adjusting and protecting slag is measured; subsequently the pulling speed is promoted to 1.0m/min at the increment of 0.1m/min per 25 seconds and the liquid level of the crystallizer is stabilized; after the liquid level of the crystallizer is stabilized for 1 minutes, an automatic liquid level control device is arranged in the liquid; after the automatic liquid level control device is arranged in the liquid for 1 minutes, the dipping type water gap insertion depth is adjusted to comply with the technological requirement; after the liquid level is stabilized for 2 minutes, the pulling speed is promoted; the promotion amplitude is 0.05m/min and the liquid level is stabilized for 1.5 minutes when the pulling speed is promoted by 0.05m/min; subsequently whether the tundish temperature complies with the steel type specification is determined; and the pulling speed is promoted to the target pulling speed. The method has the advantages of effectively avoiding the steel suspension accident of the crystallizer owning to the splashing of the molten steel.

Description

technical field [0001] The invention belongs to the field of steelmaking, and in particular relates to a method for replacing a tundish at a high liquid level of a crystallizer. Background technique [0002] In the continuous casting production process, in order to improve production efficiency and realize multi-furnace continuous casting, the method of quickly changing the tundish is generally adopted at present, and the low liquid level changing process is used. Lower it to 150mm from the edge of the copper plate, and use a baffle to prevent the molten steel from splashing during the pouring process, as shown in Figure 1. Using this operation method not only has a large amount of traces on the slab, but also is prone to accidents such as hanging steel in the crystallizer and pulling off steel at the traces during the pouring process. Contents of the invention [0003] The invention provides a method for replacing a tundish at a high liquid level of a crystallizer. The t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/00
Inventor 张润平
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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