Tundish steel strip feeding device and method

A tundish and steel belt technology, applied in the field of tundish feeding steel belt devices, can solve the problems of floating and removing unfavorable inclusions, high equipment maintenance cost, inconvenient installation and maintenance, etc., and achieves a simple structure, improved quality, and convenient operation. Effect

Active Publication Date: 2018-08-14
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Tundish steel strip feeding device and method

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Experimental program
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Effect test

Embodiment 1

[0026] When casting aluminum-killed steel, the superheat of molten steel in ladle 1 is controlled at 25°C; the steel strip 5 to be fed is installed on the belt feeding device; when the amount of molten steel in tundish 11 reaches the required range, the immersion Measure the temperature of the molten steel above the nozzle 7, and know the superheat value of the molten steel in this area according to the temperature measurement; calculate the feeding rate based on the current superheat value of the molten steel in this area and the superheat value that needs to be controlled by the target. The amount of steel strip 5. Since aluminum-killed steel is prone to flocculation, the target superheat is controlled at 10°C. During the belt feeding operation, the operator of the continuous casting machine should observe the change of the liquid steel level in the mold. Once the flocculation phenomenon occurs at the submerged nozzle, the electromagnetic induction heater 6 around the submer...

Embodiment 2

[0028] When casting non-aluminum killed steel, the superheat of molten steel in ladle 1 is controlled at 20°C; the steel strip 5 to be fed is installed on the belt feeding device; when the amount of molten steel in tundish 11 reaches the required range, the Measure the temperature of the molten steel above the submerged nozzle 7, know the superheat value of the molten steel in this area according to the temperature measurement, and calculate the feeding Enter the amount of steel strip 5. Since non-aluminum killed steel is not prone to flocculation, the target superheat is controlled at 5 °C. During the belt feeding operation, the operator of the continuous casting machine should observe the change of the liquid steel level in the mold. Once the submerged nozzle 7 is found to have frozen flocculation, the electromagnetic induction heating around the submerged nozzle 7 should be started immediately. 6, and adjust its heating power frequency to 10000Hz. After the flocculation p...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/112B22D11/108B22D11/18
CPCB22D11/108B22D11/112B22D11/18
Inventor 李德军朱晓雷廖相巍王爽李晓伟刘祥许孟春康伟刘清海于赋志
Owner ANGANG STEEL CO LTD
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