Tundish steel strip feeding device and method

Abstract

The invention provides a tundish steel strip feeding device and method. The steel strip feeding device comprises guide rolls, a supporting roll, drive rolls, a speed reducer, a motor, a compression hydraulic cylinder and a PLC; and induction heaters are arranged at the outer part of a submersed nozzle. A steel ladle is opened to inject molten steel into a tundish, and when the amount of the moltensteel reaches the requirement, the temperature of the molten steel above the submersed nozzle is measured, and the steel strip feeding device is started after a molten steel superheat degree value and a steel strip feeding quantity are obtained; the temperature of the molten steel above the submersed nozzle is measured at fixed times, and the steel strip feeding quantity is regulated according toa temperature change; and once the flocculating flow phenomenon occurs in the steel strip feeding process, the electromagnetic induction heaters are started immediately, and the molten steel in a submersed nozzle region is heated until the flocculating flow phenomenon is eliminated. The steel strip feeding device provided by the invention is simple in structure and convenient to operate, can control the superheat degree of the molten steel at 5-10 DEG C, and enables the equiaxial crystal ratio of a casting blank to be increased by 15-30 percent, thereby lowering composition segregation and shrinkage holes of a continuous casting blank and improving the quality of the casting blank.

Description

technical field [0001] The invention belongs to the technical field of smelting, and in particular relates to a tundish steel strip feeding device and method capable of reducing the superheat of molten steel. Background technique [0002] The solidification structure of the continuous casting slab can be divided into the outermost chilled layer (fine equiaxed grains), the columnar grain structure and the inner equiaxed grain structure from the outside to the inside. Since the outermost chill layer is generally about 2 mm, which is relatively thin compared to the thickness of the slab, it has almost no influence on the quality of the slab. The columnar grain structure and equiaxed grain structure have a great influence on the quality of the slab. The more developed the columnar crystals, the more serious the segregation of the slab, and in severe cases, bridges will occur, resulting in shrinkage cavities in the slab, which greatly reduces the quality of the slab. Contrary t...

AI Technical Summary

Problems solved by technology

Although these heating technologies can control the superheat of molten steel in the tundish to a low range, it requires complex and expensive equipment

In addition, it is inconvenient to install and maintain, and requires extremely high equipment maintenance costs during the application process

In addition, the biggest shortcoming of these technologies is that the temperature of molten steel in the ladle needs to be controlled at a very low level, and then heated to maintain a low degree of superheat. Although such an operation method can reduce the tapping temperature of the converter, if it flows into The molten steel in the tundish is all in the range of too low molten steel temperature, which will cause the viscosity of the molten steel to increase, which is not conducive to the floating and removal of inclusions in the molten steel

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