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Process for effectively controlling center segregation of continuous cast slab

A continuous casting slab and slab technology, which is applied in the field of continuous casting slab center segregation control, can solve the problems of reduced service life and reduced welding performance, and achieve the effects of increasing service life, ensuring effective control, and reducing pressure dependence

Active Publication Date: 2011-01-05
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For structural steel used in offshore drilling and platforms, segregation reduces its welding performance, making the material difficult to weld or even cracking, resulting in a greatly reduced service life of the steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] A steel plant adopts the method of the present invention for continuous casting slabs of 320mm×1800-2000mm medium-carbon low-alloy steel. The value is controlled between 1250-1300KN, and the water volume of the inner and outer arc sides of the continuous casting slab in the soft reduction section is controlled at 8m respectively 3 / h and 10m 3 / h, the segregation level of the continuous casting slab low-magnification inspection center is Class C 1.0.

Embodiment 2

[0009] A steel plant adopts the method of the present invention for 350mm×1850-2150mm ordinary carbon steel continuous casting slabs. The average superheat degree of the tundish steel level is 18°C, the casting speed is 0.75m / min, and the pressure value of the hydraulic cylinder in the lower stage of light pressing is controlled Between 1250-1400KN, the water volume of the inner and outer arc sides of the continuous casting slab in the soft reduction section is controlled at 10m respectively 3 / h and 12m 3 / h, the segregation level of the continuous casting slab low-magnification inspection center is Class C 1.0.

Embodiment 3

[0011] A steel plant adopts the method of the present invention for 300mm×1900-2150mm low-carbon steel continuous casting slabs. The average superheat degree of the steel level in the tundish is 25°C, the casting speed is 0.85m / min, and the pressure value of the hydraulic cylinder in the lower stage of light pressing is controlled Between 1300-1430KN, the water volume of the inner and outer arc sides of the continuous casting slab in the soft reduction section is controlled at 9m respectively 3 / h and 10m 3 / h, the segregation level of the low-magnification inspection center of the continuous casting slab is 0.5 of the C class.

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PUM

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Abstract

The invention relates to a process for effectively controlling center segregation of a continuous cast slab, in particular to a method for controlling the center segregation of the continuous cast slab with the thickness of more than 300mm. In the method, the center segregation is effectively controlled by combining stronger secondary cooling water quantity at the solidification tail end of the continuous cast slab with hydraulic cylinder pressure control on a soft reduction section. The pressure value of the hydraulic cylinder on the soft reduction section is controlled to be between 1,200 and 1,500KN, the inner arc side water quantity of the continuous cast slab on the soft reduction section is controlled to be between 6 and 12m<3> / h, and the outer arc water quantity of the continuous cast slab on the soft reduction section is controlled to be between 9 to 15m<3> / h. The cooling intensity on the surface of the continuous cast slab on the soft reduction section is increased, the shrinkage of the surface and the core of the continuous cast slab is consistent, the center segregation is controlled to a certain extent, the single dependency of center segregation control of the continuous cast slab on the hydraulic cylinder pressure on the soft reduction section is reduced, the service life of the soft reduction equipment is prolonged, and the process is simple, convenient and feasible.

Description

technical field [0001] The invention relates to a method for controlling the central segregation of a continuous casting slab, in particular to a method for effectively controlling the central segregation of a continuous casting slab with a thickness greater than 300mm. Background technique [0002] As people have higher and higher requirements on the quality of steel products, the central segregation defects of continuous casting slabs have increasingly become the main factor affecting the quality of steel products. , and one of the main factors of steel plate yield. At the same time, the central segregation of the continuous casting slab will have an adverse effect on the processing and service life of the steel. For example, for the pipeline steel that transports natural gas, the H in the transport medium 2 S will erode on the surface of the tube wall to generate hydrogen atoms, which diffuse into the tube wall and recombine into H at the segregated and loose parts of th...

Claims

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Application Information

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IPC IPC(8): B22D11/16
Inventor 王文军刘洋朱志远郝宁李景光李战军杨国伟白学军关春阳姜中行宁林新王玉龙刘金刚沈峰
Owner SHOUGANG CORPORATION