Argon-blowing prefabricated member for continuous casting tundish cover

Abstract

The invention relates to an argon-blowing prefabricated member for a continuous casting tundish cover and belongs to the technical field of ferrous metallurgical equipment. Argon-blowing prefabricated members with difference sizes can be designed according to the size of a baking hole, a charging hole, a plug hole and the like of the tundish cover. The argon-blowing prefabricated member comprises a prefabricated member body; the argon-blowing prefabricated member body has a shape of a cone of which the radius of the upper bottom is greater than that of the lower bottom, or the longitudinal section structure of the prefabricated member body is T-shaped. The prefabricated member body is hollow, an aeration pipeline is arranged in the prefabricated member body, and the prefabricated member body is provided with an aeration hole communicated with the aeration pipeline. The argon-blowing prefabricated member solves the problems that the peripheries of the baking hole and the plug hole are deformed and refractory materials fall off, and guarantee the cast-on can be performed smoothly; and the tightness of the tundish cover is improved, the reduction of the molten steel temperature is inhibited, the molten steel is prevented from being oxidized for secondary time, and meanwhile, the service life of the tundish cover can be prolonged.

Description

technical field [0001] The invention relates to an argon-blowing preform for continuous casting tundish covers, and belongs to the technical field of iron and steel metallurgical equipment. Background technique [0002] With the rapid development of metallurgical technology and the further improvement of users' requirements for steel cleanliness and quality, the continuous casting tundish, as the last container for liquid steel in the steelmaking production process, has been used only as a liquid steel storage and The simple container of the distributor is transformed into a multifunctional metallurgical reactor with the functions of preventing secondary oxidation of molten steel, removing inclusions in steel, improving cleanliness of molten steel, and microalloying. [0003] The tundish is generally equipped with a tundish cover, and the tundish cover is generally equipped with a stopper rod installation hole, a baking hole, a pouring hole, a feeding hole, a temperature mea...

AI Technical Summary

Problems solved by technology

Due to the large thermal conductivity and poor oxidation resistance of the all-cast iron or cast steel tundish cover, problems such as corrosion, sticking to steel, deformation, and cracking may occur during use, resulting in a low actual service life of the tundish cover; The steel structure-refractory composite structure tundish cover has been greatly improved in terms of thermal insulation and service life by taking measures such as improving the cover structure and optimizing materials, but there are still the following disadvantages: the tundish cover (especially Around the baking hole), the inner lining is delaminated and dropped, blocking the upper nozzle of the tundish, resulting in pouring accidents and serious deformation of the cover in the later stage of pouring, poor sealing performance of the tundish, and increased secondary oxidation of molten steel, etc.

The average amount of nitrogen increase after argon blowing using the present invention is 9ppm, which is 18ppm less than that without argon blowing, which plays a positive role in reducing the oxide inclusions of the slab and improving the quality of the slab, but the device has the following disadvantages: 1. , During the baking and pouring process, the lining of the tundish cover (especially around the baking hole) is easy to delaminate and drop materials, which will block the upper nozzle of the tundish, resulting in pouring accidents and serious deformation of the cover in the later stage of pouring. Short life; 2. The baking holes, feeding holes and pouring holes on the tundish cover are easily deformed, the hole walls are cracked, and the replacement frequency of the tundish cover is increased. Frequent replacement of the tundish cover is time-consuming, laborious and costly; 3. The cover Poor sealing and heat preservation effects, temperature drop of molten steel and increased degree of secondary oxidation

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