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Wide and thick plate continuous casting machine dry capping method

A continuous casting machine and wide and thick plate technology, which is applied in the field of dry capping of wide and thick plate continuous casting machines and continuous casting final casting capping technology, and can solve the problems of poor quality of tail blanks of wide and thick plate continuous casting machines, low flaw detection pass rate, and metal harvesting. Low rate and other problems, to achieve the effect of improving the pass rate of flaw detection and improving the surface quality

Active Publication Date: 2017-03-22
SHOUGANG JINGTANG IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a dry-type capping method for a wide and thick plate continuous casting machine, which solves the problems of poor quality of the tail blank of the wide and thick plate continuous casting machine, low pass rate of flaw detection, and low metal yield

Method used

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  • Wide and thick plate continuous casting machine dry capping method

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Embodiment 1

[0018] A steel mill adopts the method of the present invention for continuous casting slabs of medium-carbon low-alloy steel of 250mm*(1800-2400)mm. After the pouring cycle is completed and the ladle is stopped, the molten steel level in the tundish is measured. For the tonnage of the bale, when the remaining molten steel in the middle bag is 18t, the drawing speed will be uniformly reduced from the target pulling speed of 0.95m / min to 0.25m / min; when the remaining molten steel in the middle bag is 4t, the stopper shall be closed to stop pouring and at the same time The pulling speed is reduced to 0.15m / min, and the operation is maintained at a uniform speed. At this stage, no slag is added, but no slag removal operation is carried out; when the tailstock runs to the lower mouth of the mold, the speed is increased evenly according to the acceleration of 0.05m / min every 30s. When the pulling speed reaches 0.5m / min, the acceleration is increased by 0.1m / min every 20s to reach the ...

Embodiment 2

[0019] A steel mill adopts the method of the present invention for continuous casting slabs of medium-carbon low-alloy steel of 180mm*(1600-1800)mm. After the pouring cycle is completed, the molten steel level in the tundish is measured and the For the tonnage of the bale, when the remaining molten steel in the tundish is 16t, the drawing speed will be uniformly reduced from 1.1m / min to 0.25m / min; when the remaining molten steel in the tundish is 3t, the stopper will be closed to stop pouring, and the The pulling speed is reduced to 0.2m / min, and the operation is maintained at a constant speed. At this stage, no slag is added, but no slag removal operation; when the tailstock runs to the lower mouth of the crystallizer, the speed is increased evenly according to the acceleration of 0.05m / min every 20s. When the pulling speed reaches 0.5m / min, the acceleration is increased by 0.1m / min every 20s to reach the target pulling speed 1.2m / min. The tail billet is in weak cooling mode, ...

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Abstract

The invention relates to a wide and thick plate continuous casting machine dry capping method, and belongs to the technical field of continuous casting technologies. The wide and thick plate continuous casting machine dry capping method particularly comprises the following steps and parameters that in the speed reduction stage, according to the actual measurement tundish tons, in cooperation the tundish measurement actual liquid level, the pull speed is reduced to 0.25 m / min; in the low-speed and constant-speed running stage, according to the tundish tons and the actual measurement liquid level, when the depth of the liquid face of molten steel in a tundish ranges from 100 mm to 300 mm, a plug bar is closed, meanwhile, the pull speed is reduced to 0.15 m / min to 0.2 m / min, and low-speed running is kept; and in the speed increasing process, the blank tail is pulled out of a crystallizer, and the pull speed is increased to a target pull speed. The wide and thick plate continuous casting machine dry capping method has the beneficial effects that slag is not wasted, slag fishing is avoided, low-speed weak-cold control is achieved, and therefore the effective improvement of the tail blank quality is achieved, the tail blank flaw detection yield is improved, the tail blank waste cutting amount is reduced, and the metal yield is improved.

Description

Technical field [0001] The invention belongs to the technical field of continuous casting technology, and particularly relates to a dry capping method for a wide and thick plate continuous casting machine. In particular, it relates to a continuous casting final pouring and capping technology. Background technique [0002] Faced with the continued downturn in the steel industry, the only way out for large and heavy plate companies is to look inward, practice hard work, and reduce costs and increase efficiency. Through technological innovation, continuous optimization of production technology and improvement of continuous casting metal yield are an important means to reduce costs and increase efficiency. [0003] The traditional wide and heavy plate continuous casting capping process adopts the water capping method. When this method is used for capping operation, the quality of the tail stock is poor, and serious defects such as center segregation, center shrinkage, and middle crack...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/20B22D11/22
CPCB22D11/201B22D11/225
Inventor 曹磊王国连史志强田志伟张星刘茁松王传财
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD
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