Continuous casting machine and small square billet soft reduction device

Abstract

The invention relates to a small square billet continuous casting machine comprising a crystallizer, a strand support roller bed, a soft reduction device and a tension leveler, wherein the soft reduction device is arranged in a solidification tail end area of casting blanks and comprises at least one group of reduction units; each group of reduction units is a reduction system consisting of two pairs of upper compression rollers and lower compression rollers; the size of a roller gap formed between the upper compression roller and the lower compression rollers corresponds to the specification of the small square billets; and the length of the reducable interval of the soft reduction device is matched with the length of the solidification tail end area of the small square billets. The invention also relates to the soft reduction device of the small square billet continuous casting machine. The invention can improve the density inside the square billets, so that the phenomena of center porosity and center segregation of the small square billets can be effectively controlled.

Description

technical field [0001] The invention relates to the field of metallurgical continuous casting, in particular to a continuous casting machine and a billet light reduction device applied to the continuous casting machine. Background technique [0002] In the field of iron and steel smelting, continuous casting machines are used to cast molten steel into fixed shapes. see figure 1 , shows an existing continuous casting machine, including a crystallizer 11, a roller table 12, a light pressing device 13 and a tension leveler 14. The molten steel from the converter or electric furnace is poured into the crystallizer 11, and the crystallizer 11 casts it into a billet 15 such as a slab or billet, and the billet 15 is drawn to the roller table 12 by a dummy bar (not shown in the figure) Cool and form. [0003] The soft reduction device 13 is arranged at the end of the roller table 12. When the cast slab 15 reaches the soft reduction device 13, the outer surface has generally been ...

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Problems solved by technology

[0004] However, the upper pressing roller 131 and the lower pressing roller 132 of the existing light pressing device 13 are respectively installed on different frames (not shown in the figure), and are limited by the structure of the frame, and the distance between the rollers is relatively large. The depressible range is also relatively large, while the billet section is small, and the range of pulling speed varies greatly. The billet enters the depressible range of the light reduction device 13, because the depressible range does not match the billet seriously. In the process of pressing, it is easy to cause problems such as center segregation, center looseness and center shrinkage cavity of the billet, which seriously affects the quality of the billet

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