Process method for improving quality and yield of continuous casting tail billet

Abstract

The invention discloses a process method for improving the quality and yield of continuous casting tail billet, and belongs to the technical field of metallurgical continuous casting. The process method includes the steps that when the tail billet is obtained after continuous casting, a special metallurgical heating agent is evenly sprinkled into a mold liquid level, and when the tail billet is about to be pulled out of a mold, the secondary cooling water is closed sequentially from top to bottom. The metallurgical heating agent can be in chemical reaction with liquid steel of the tail billet,heat is continuously released, and in the absence of the cooling effect of the secondary cooling water, the top of the tail billet remains in a high temperature liquid state, so that the solidification time of the tail billet is prolonged, the volume shrinkage of a liquid core is supplemented by metal iron generated by exothermic reaction and iron of the heating agent, and the purposes of improving the solidification structure quality of the tail billet and the yield rate of the molten steel of the tail billet are achieved.

Description

technical field [0001] The invention relates to the technical field of continuous casting technology in the metallurgical industry, and more specifically relates to a process method for improving the quality and yield of continuous casting tail blanks. Background technique [0002] The molten steel is poured by the continuous casting machine to form a continuous casting slab. When the pouring is about to end, it needs to be finished. The conventional finishing process of the continuous casting is: after the tundish is poured, the liquid level drops as the casting progresses. The tail billet is pulled out of the crystallizer, but under the spraying effect of the secondary cooling water, the liquid level on the top of the tail billet cools down rapidly and forms a solidification shell. The secondary cooling water falls on the solidified shell and gathers to further produce cooling effect, so that the tail blank not only transfers heat along the circumferential direction, but a...

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the problems of quality defect of cast slab and low yield of molten steel produced during continuous casting of tail billet in the prior art, and to provide a process method for improving the quality and yield of tail billet of continuous casting; the present invention The invention cuts off the steel flow at the end of pouring, and then moves the tundish car out of the pouring position, and uniformly adds the metallurgical heating agent into each stream of crystallizer, and the exothermic reaction occurs between the metallurgical heating agent and the FeO in the tail blank, which is continuous Each area of ​​the cast tail billet provides sufficient heat to reduce the solidification rate of the tail billet shell. At the same time, the metallic iron generated by the exothermic reaction and the iron in the metallurgical heating agent will enter the center of the tail billet, thereby feeding the continuous casting tail billet. Improve the structure of the internal solidification group, refine the grain of the structure, and increase the density of the tail blank, thereby reducing the amount of tail blank removal and increasing the yield of molten steel

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