A device for simulating the initial solidification of molten steel in a mold

Abstract

A device for simulating the initial solidification of molten steel in a crystallizer. The inner surface of the heating furnace is covered with a refractory material layer. The inside of the refractory material layer is a molten steel cavity. A refractory material baffle is provided at the bottom of the molten steel cavity. The first lifting rod passes through The bottom of the heating furnace is firmly connected to the refractory material baffle; the water-cooled crystallizer is located on the upper part of the heating furnace and the two are sealed and connected through a sealing ring. The second lifting rod is vertically installed above the water-cooled crystallizer, and its lower end is connected to a thermocouple. The invention has the ability to directly obtain the initial solidified shell in the mold, and simulates the solidification behavior of the initially solidified shell in the mold by squeezing the molten steel for reverse movement, which can ensure the stability of the molten steel level and ensure the stability of the molten steel. The surface conditions are more consistent with the actual on-site continuous casting steel liquid level conditions; through the initial solidification of the continuous casting billet obtained, and then combining the macroscopic heat transfer solidification with the microstructure, more reasonable process parameters can be designed, thereby reducing the need for continuous casting. The occurrence of billet quality defects.

Description

technical field [0001] The invention belongs to the technical field of iron and steel continuous casting simulation experiments, in particular to a device for simulating the initial solidification of molten steel in a crystallizer. Background technique [0002] As an important link in steel production, continuous casting is of great significance to improving the overall yield, improving the quality of slabs, and reducing energy consumption. The crystallizer is a water-cooled steel ingot mold, which has important functions such as heat transfer, molten steel purification, and quality control. It is also called the "heart" of the continuous casting machine. [0003] Molten steel is poured into the mold from the tundish through the intrusive nozzle, and cooled and solidified in the mold to form a billet with a certain external dimension. The billet is continuously pulled out from the bottom of the mold, and undergoes straightening, secondary cooling, and cutting processes. For...

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Problems solved by technology

If the initial solidification behavior in the crystallizer is not appropriate, it will lead to various quality defects of the slab, such as subcutaneous inclusions, vibration marks, segregation, etc., and these defects can lead to deterioration of product quality, which will not only reduce the metal yield, but also affect the quality of the casting. Subsequent rolling processes will also have adverse effects, so in-depth research on the solidification behavior of the initial slab shell in the mold is the key to improving the quality of continuous casting slabs

[0004] Since the production of continuous casting slabs is a continuous process, it is difficult to obtain the meniscus area. Therefore, the research on the solidification structure at this stage is mainly to sample and analyze the finished continuous casting slabs from steel mills, which is difficult to obtain in the laboratory. The solidification structure of the initial billet shell under a specific period and process conditions, and the samples brought back from the steel factory have undergone subsequent straightening, secondary cooling, pressing and other operations, and the relevant characteristics of the initial solidification behavior have undergone complex thermal- The force will be altered or covered, therefore, the specimen observations will not correspond to the real initial solidified structure

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