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Ultra-thick slab continuous casting tundish butt-joint speed increasing operation method

A slab continuous casting and operation method technology, applied in the field of iron and steel production, can solve problems such as difficult production operations, achieve good promotion value, improve stability, and reduce production costs

Inactive Publication Date: 2021-01-15
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The thickness of the slab above 260mm is thicker than that of the general medium and thick slab continuous casting machine. Although the butt joint operation process is basically the same, because of the thicker thickness, it takes more time for the solidification of the slab to achieve the stable connection of the front and rear slabs. As for the breakout of the crystallizer due to poor solidification and connection after the start, the breakout occurred in the crystallizer, which caused huge economic losses and also brought great difficulties to the production operation.

Method used

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  • Ultra-thick slab continuous casting tundish butt-joint speed increasing operation method

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Embodiment

[0044] This embodiment provides a super-thick slab continuous casting tundish butt joint speed-up operation method, such as figure 1 shown, including the following steps:

[0045] (1) Tundish docking

[0046] S1. After the pouring of the last furnace of the last group is completed, rotate the turret of ladle 1 to the horizontal position, and prepare to measure the remaining molten steel depth in the tundish. slag;

[0047] S2. When the remaining molten steel in the tundish is below 30t, reduce the production speed and start measuring the depth of molten steel in the tundish;

[0048] S3. When the tonnage of the tundish reaches 20t, check the spare baking tundish;

[0049] S4. When the tonnage of the tundish reaches 15t, the casting speed is reduced to 0.8m / min; when the liquid level of the tundish is below 300mm, remove the pressure rod of the tundish stopper rod, close the rod, and at the same time drive into the blind plate, and the pouring position is produced The casti...

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Abstract

The invention discloses an ultra-thick slab continuous casting tundish butt-joint speed increasing operation method, relates to the technical field of steel production. The ultra-thick slab continuouscasting tundish butt-joint speed increasing operation method can reduce the damage to equipment due to throwing and large straightening resistance caused by overcooling of a casting blank during lowpulling speed in the butt-joint process on the premise of ensuring smooth butt-joint of continuous casting tundishes, avoids the butt-joint bleed-out condition caused by poor connection of a front blank shell and a rear blank shell due to high butt-joint speed increase, improves the butt-joint stability of ultra-thick slab continuous casting to the maximum extent, and achieves the purposes of stable and high yields of a continuous casting machine and production cost reduction.

Description

technical field [0001] The invention relates to the technical field of iron and steel production, in particular to a speed-up operation method for butt jointing of ultra-thick slab continuous casting tundishes. Background technique [0002] The high-efficiency continuous casting process has become an economical and reasonable production process in the field of metallurgy at home and abroad. The number of continuous casting furnaces plays a decisive role in the production efficiency and product cost of the continuous casting machine. Increasing the number of continuous casting furnaces can not only increase the operation rate of the continuous casting machine, but also increase the metal yield, and can also reduce raw material consumption and billet cost. In addition, multi-furnace continuous casting is also a necessary condition for billet hot charging and hot delivery and direct rolling. In order to realize multi-furnace continuous casting, tundish quick change or docking...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/16B22D11/20
CPCB22D11/16B22D11/20
Inventor 王雄文伏兆勇程传良
Owner NANJING IRON & STEEL CO LTD
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