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

Abstract

The invention discloses a device for simulating initial solidification of liquid steel in a crystallizer. The inner surface of a heating electric furnace is covered with a fireproofing layer. A liquid steel cavity is formed in the fireproofing layer. A fireproofing baffle is arranged at the bottom of the liquid steel cavity. A first lifting rod penetrates the bottom of the heating electric furnace and is fixedly connected with the fireproofing baffle. The water-cooling crystallizer is located on the heating electric furnace, and the water-cooling crystallizer and the heating electric furnace are in sealing connection through a sealing ring. A second lifting rod is vertically arranged on the water-cooling crystallizer. The lower end of the second lifting rod is connected with a thermocouple. The device has the capability of directly obtaining an initial solidification blank shell in the crystallizer, simulates the solidification behavior of the initial solidification blank shell in the crystallizer by extruding liquid steel to move reversely and can guarantee the stability of the liquid steel face, and the steel liquid face coincides with the actual site continuous casting liquid steel face better. By means of the obtained continuous casting blank initial solidification blank shell and combination of macroscopic heat transferring solidification and microstructure, more reasonable technical parameters can be designed, and then quality defects of the continuous casting blank are reduced.

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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