Construction method of tundish for continuous molten steel casting in steel mill

Abstract

The invention provides a construction method of a tundish for continuous molten steel casting in a steel mill. The construction method comprises the following steps: cleaning residues in the tundish on which a permanent layer is well cast, well mounting a buffer brick, a retaining wall and a dam, and smearing a working layer; pricking vent holes in the smeared working layer; hoisting the tundish to a baking table to bake the working layer, wherein three stages of small fire, moderate fire and big fire are sequentially performed in the baking process; hoisting the tundish of which the working layer is baked onto a storage platform, and mounting an asbestos leakproof ring; mounting an upper nozzle and an upper nozzle brick cup; filling a gap between the upper nozzle and the body of the tundish, as well as between the upper nozzle brick cup and the body of the tundish, with a dry ramming material after mounting the upper nozzle and the upper nozzle brick cup, and performing tamping for tightness; and covering with a tundish cover, and mounting a stopper and stopper machinery to finish construction of the tundish. According to the construction method, damages, caused by high-temperature baking, to a nozzle quick-change mechanism are reduced; convenience is brought for examining the baking quality and the in-tundish cleanliness; the machinery collision probability in the hoisting process is reduced; the dry material is prevented from leakage; and the construction method is safe and reliable and is convenient to operate.

Description

technical field [0001] The invention relates to the technical field of continuous casting in steelmaking plants, in particular to a construction method for a tundish for continuous casting of molten steel in a steelmaking plant. Background technique [0002] The tundish is an essential container in the molten steel pouring process, and it has the functions of distributing and purifying molten steel. [0003] During the pouring process, the molten steel generally flows into the tundish through the ladle nozzle, and the molten steel in the tundish flows into the crystallizer through the tundish nozzle system and enters the continuous casting machine to form a slab. Generally, tundish can be divided into single-stream tundish, dual-stream tundish and multi-stream tundish. [0004] At present, the slab pouring in steelworks is mostly single-strand or double-strand tundish. The tundish is composed of a permanent layer and a working layer. The working layer is painted with magnes...

AI Technical Summary

Problems solved by technology

However, since the nozzle system is completed before the coating of the working layer, the baking temperature of the working layer reaches about 1000°C, so that the nozzle quick-change mechanism and the stopper mechanism will be damaged to a certain extent during baking, and at the same time, the process of lifting and transporting the tundish back and forth is often Causes mechanical collision damage to the stopper rod, which poses a great safety hazard in the steel pouring process and is not conducive to production organization

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