Method for soft reduction through bulging

A light reduction and bulging technology, which is applied in the field of continuous casting of iron and steel, can solve the problems of heavy maintenance workload, billet quality problems, large reduction pressure, etc., and achieve the effect of improving operation rate, improving reliability and reducing quantity

Inactive Publication Date: 2012-02-01
上海亚新连铸技术工程有限公司 +1
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AI Technical Summary

Problems solved by technology

The condition of the secondary cold room is extremely bad. The clamping, cooling and lubricating design of the close-packed rollers complicates the equipment, and the maintenance workload is heavy. The quality of the slab is often caused by the jamming of the close-packed rolls.
The essence of light reduction is to reduce and distribute the molten steel in the thick paste area in the middle of the billet, so that the deformation of the solid billet shells on both sides is forced to be reduced, resulting in the need for a large reduction pressure. limited effect

Method used

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  • Method for soft reduction through bulging
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  • Method for soft reduction through bulging

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Embodiment Construction

[0020] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0021] Such as figure 1 and figure 2 As shown, a method of using bulging for light reduction according to the present invention is suitable for the end of the solidification stage of the slab. The method first selects the bulging 110 with a relatively complete surface of the slab 100, and then controls the tension leveler The upper roll 210 of the upper roller 210 gives a certain amount of reduction to the belly 110, so that the molten steel in the dense paste area 120 inside the cast strand 110 is reasonably distributed in a certain space. The bulging 110 is a defect-free arc-shaped slab with a high middle and low surroundings, thereby reducing the severity of segregation while eliminating the bulging, reducing porosity and shrinkage cav...

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Abstract

The invention discloses a method for soft reduction through bulging, which is suitable for the end of a solidification stage of a casting blank. The method comprises the following steps of: controlling bulging which is generated on the surface of a shell of the casting blank and does not have any internal defect, and applying certain reduction to the bulging by using upper and lower rollers of a straightening machine to make molten steel in a thick area in the casting blank reasonably distributed in a certain space, so that segregation severity is reduced, intermediate porosity and shrinkage of the casting blank are reduced, and the internal quality of the casting blank is improved.

Description

technical field [0001] The invention relates to the field of continuous casting of iron and steel, in particular to a method for lightly reducing by using a bulge. Background technique [0002] Continuous casting is the casting of liquid unshaped molten steel into a solid metal of the desired geometry. Billets, rectangular billets and slabs occupy an absolute dominant position in the total continuous casting. In the production process of large-section billets, due to the large size of the inner and outer arcs, the static pressure of molten steel in the secondary cooling process causes the solid billet shell to protrude outward, forming the so-called "bulging" defect in the geometric dimensions of the billet. [0003] Bulging is the product of the static pressure of molten steel in the continuous casting process. The modern continuous casting academic circles and engineering circles treat and deal with the bulging as a harmful defect, and strive to eliminate the bulging. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/16
Inventor 唐杰民刘小军唐秋焱程志伟
Owner 上海亚新连铸技术工程有限公司
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