Capping method for reducing finishing quantity of slab continuous casting tailing billet and increasing temperature of billet tail

A slab continuous casting and tail billet technology, which is applied in the field of reducing the finishing amount of the slab continuous casting tail billet and increasing the capping temperature of the tail billet, and can solve the problems of reducing the specific water volume, shrinkage cavity of the tail billet, and not distinguishing steel types Information and other issues, to achieve the effect of increasing the temperature of the billet tail, reducing the finishing amount, reducing the shrinkage cavity and slag inclusion amount of the tail billet

CN109014106AActive Publication Date: 2018-12-18SHANGHAI MEISHAN IRON & STEEL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2018-12-18

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Abstract

The invention relates to a capping method for reducing the finishing quantity of slab continuous casting tailing billet and increasing the temperature of the billet tail. The method comprises the following steps that (1) according to the normal final pouring deceleration curve, the final pouring steel flow closing and tailing billet turning mode are conducted, meanwhile, the drawing speed of a continuous casting machine is set at the crawling drawing speed, the crawling speed distance is tracked, and the running interval length of the crawling speed is 2 / 3 of the length of a crystallizer; (2)after the running length of the crawling speed of the tailing billet exceeds 2 / 3 of the length of the crystallizer, the drawing speed of the casting machine is controlled at 0.3-0.5 m / min for low drawing speed running, the running length is tracked, after the running length of the billet tail is greater than the length of the crystallizer, the foot roller water volume of the crystallizer is openedaccording to 80% of the maximum water volume, the purpose is for force cooling of the head of the billet tail, and the fact that the a rising accident does not occur during capping is ensured; (3) the tailing billet at the arc and fan section of the casting machine is cooled; and (4) the tailing billet enters the horizontal section and then is subjected to cooling control. By means of the technical scheme, the hole shrinkage and the slag amount of the tailing billet can be minimized in the case that the tailing billet capping does not rise is ensured, and the finishing quantity of the continuous casting tailing billet is reduced accordingly.
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Description

technical field

[0001] The invention relates to a capping method, in particular to a capping method for reducing the trimming amount of slab continuous casting tail blanks and increasing the temperature of the billet tail, and belongs to the technical field of iron and steel metallurgy continuous casting. Background technique

[0002] In current metallurgical enterprises, most slab continuous casting machines mainly include main equipment such as crystallizer, 0# section, sector section, straightening section, and horizontal section. Continuous casting is essentially to continuously inject molten metal into the crystallizer to form a solid shell with a certain strength and then pull out the cast slab. Tail-drawing is an essential link in continuous casting production, and every time a pouring process starts, a tail-drawing process is bound to occur. When the tail billet is continuously cast, operations such as slowing down, stopping, pumping water, and stirring are usually ...

Examples

Embodiment 1

[0025] Embodiment 1: see figure 1 , a capping method for reducing the trimming amount of the slab continuous casting tail and increasing the temperature of the tail of the slab, the method is as follows:

[0026]1) During the final pouring, reduce the casting speed to 0.6 / m / min-0.8m / min, and control the casting speed to 0.3m / min-0.4m / min after maintaining for 2 minutes; close the steel flow at the final pouring, At the same time of turning the tail billet, set the casting speed of the continuous casting machine to the crawling speed, track the distance of its crawling speed (generally 0.1m / min), and the length of the crawling speed running interval is 2 / 3 of the mold length; this interval Take no slag, no water operation.

[0027] 2) When the running distance of the tail billet crawling speed exceeds 2 / 3 of the mold length, control the casting machine casting speed to run at a low casting speed of 0.3-0.5m / min, and track its running length. After the length of the crystalliz...