Continuously cast bloom shape control method and crystallizer

Abstract

The invention provides a continuously cast bloom shape control method and a crystallizer. The continuously cast bloom shape control method comprises the following steps: feeding molten steel into the crystallizer so as to form a cast bloom; enabling the cast bloom to be initially solidified into a negative bulge shape in a first pair of side walls of the crystallizer, namely enabling the cast bloom to bulge towards the center line of the crystallizer in the first pair of side walls of the crystallizer. The crystallizer comprises the first pair of side walls, a second pair of side walls, a first group of lateral support rolls positioned at the down streams of the first pair of side walls and a second group of lateral support rolls positioned at the down streams of the second pair of side walls; on the cross section of the crystallizer, the inside surfaces of the first pair of side walls are in a smoothly-transitional curve shape; the curve is of a shape which gradually keeping away from a vertical plane passing through the center line from the middle part to two end edges; the distances between the inside surfaces of the first pair of side walls in the middle part and the vertical plane passing through the center line are smaller than those between the inside surfaces of the first pair of side walls in the edge parts and the vertical plane passing through the center line.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a method for controlling the shape of a continuous casting slab and a crystallizer. Background technique [0002] Usually in continuous casting production: molten steel forms an initial solidification shell in the mold (Mold), and the initial solidification shell must have a certain thickness when it exits the mold, and can withstand the static pressure of liquid steel in the mold (Mold) without cracking, but During the solidification process of molten steel, the inhomogeneity of cooling in the mold (influenced by mold slag, continuous casting speed, continuous casting temperature, etc.), causes the initial slab solidification shell to be uneven, and under the static pressure of liquid steel, the solidified slab The shell will deform outwards, forming a billet bulging phenomenon. [0003] During the hot rolling process of the slab with a bulging belly, during the process of pressing th...

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Problems solved by technology

[0005] The invention provides a method for controlling the shape of a continuous casting slab and a crystallizer to solve the problem that the large amount of continuous casting slab belly affects the yield of the product

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