Digital hydraulic on line casting rolling / Dynamic soft-reduction

Due to the segregation of the microporosity elements, the center line of the slab produced by the traditional process is gathered in the center line of the alloy. At the same time, the center line is in the presence of segregation, the organization is loose, and the situation is even worse. These defects are quite dangerous, which lead to hot rolling in the rolling process, or make the internal crack growth to the plate surface. Dynamic soft reduction process, continuous casting machine can control the final solidification stage, to avoid the center of the slab loose and to minimize the degree of segregation. Dynamic soft reduction to produce the best quality of the inner quality of the slab. With the principle of direct rolling of strip steel for thin slab casting in the world continuously successful practice, the production of high quality products of iron and steel enterprises have begun to widely used soft reduction control technology.

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Dynamic soft reduction process can not only ensure the flexibility and reliability of production, but also can greatly improve the performance of the product. The use of soft reduction makes the porosity and axial segregation of the slab generally lower, and the soft reduction causes the convective movement, which makes the molten steel mixed and produces the following results:

• Convective motion makes the composition of liquid steel tend to be uniform;

• High temperature and in the presence of partial segregation of the slab liquid core part, arise due to the soft reduction of convective motion, liquid core part of liquid steel and dendrite end contact after the remelting, and with little segregation of liquid steel mixed and diluted;

• Convective motion will be separated from the inner surface is melting of solid crystals sent to the position of the center of the sheet, because it acts as a nucleating effect and favorable solidification of liquid steel in the slab center;

• The thermal loss of dendrite remelting reduces the degree of cooling, which is helpful to the solidification of the dendritic crystal;

• At the end of soft reduction, the end of dendrite is broken through the mechanical action, and the nucleation and crystallization are accelerated;

• Mechanical action in the liquid core area can not be extended too much, to avoid large pressure and the formation of cracks, and therefore must be dynamic.

In addition, due to the liquid core produced by extrusion homogenization, soft reduction also reduces the macrosegregation.

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AEMETEC by itself to have the world's leading industrial digital transmission technology, pioneered digital continuous casting machine online soft reduction (casting rolling) control system, making the system free from vulgarity to avoid using the problems of the traditional servo technology, not only makes the light pine can be achieved, at the same time, low investment and maintenance, greatly reducing the use difficulty, has become a necessary choice for the upgrading of the continuous casting machine, to win the necessary means for Chinese iron and steel industry compete with foreign counterparts.