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Convex foot roller for continuously casting plate blank and method for improving center segregation and porosity of continuously cast plate blank

A slab continuous casting and foot roll technology is applied in the field of slab production to achieve the effects of improving the reduction effect, reducing the center porosity and reducing the stress.

Active Publication Date: 2018-03-09
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention provides a protruding foot roll for slab continuous casting, aiming to solve the problem of how to weaken the center segregation of the continuous casting slab and reduce its center porosity

Method used

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  • Convex foot roller for continuously casting plate blank and method for improving center segregation and porosity of continuously cast plate blank
  • Convex foot roller for continuously casting plate blank and method for improving center segregation and porosity of continuously cast plate blank
  • Convex foot roller for continuously casting plate blank and method for improving center segregation and porosity of continuously cast plate blank

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The above-mentioned method for improving the segregation and porosity of the continuous casting slab center was applied to a 230mm×1850mm slab continuous casting machine in a steel factory.

[0038] Such as figure 2 As shown, the continuous casting slab 200 entering the secondary cooling zone is subjected to reduction treatment by using a tension leveler; the tension leveler includes an upper foot roll and a lower foot roll, and the upper foot roll is any one of the above-mentioned slabs Convex footed rolls for continuous casting, the lower footed rolls are flat footed rolls;

[0039] Among them, there are 5 pulling and leveling machines for pressing;

[0040] In the drawing direction, the length of the middle protrusion 110 and the length of the side protrusions 120 of the upper foot rolls of each drawing and straightening machine are all successively reduced, and the length of the middle protrusion 110 of the first upper foot roll is 220mm, and the adjacent The len...

Embodiment 2

[0044] The above-mentioned method for improving the segregation and porosity of the continuous casting slab center was applied to a 230mm×1850mm slab continuous casting machine in a steel factory.

[0045] Such as image 3 As shown, the continuous casting slab 200 entering the secondary cooling zone is subjected to reduction treatment by using a tension leveler; the tension leveler includes an upper foot roll and a lower foot roll, and the upper foot roll and the lower foot roll are any The above-mentioned convex foot roll for slab continuous casting;

[0046] Among them, there are 5 tension levelers for pressing, and the upper edge of the raised structure on the lower foot roller is kept level with the upper edge of the flat roller at the front end of the secondary cooling zone;

[0047] In the drawing direction, the length of the middle protrusion 110 and the length of the side protrusions 120 of the upper and lower foot rolls of each drawing leveler decrease successively; ...

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Abstract

The invention belongs to the technical field of the production of plate blanks, and particularly discloses a convex foot roller for continuously casting a plate blank and a method for improving the center segregation and porosity of the continuously cast plate blank. The method aims at solving the problems how to weaken the center segregation of the continuously cast plate blank and lighten the center porosity of the continuously cast plate blank. The convex foot roller for continuously casting the plate blank comprises a roller body and a bulge structure, wherein the bulge structure is arranged on the roller body; the bulge structure comprises an intermediate bulge arranged in the middle of the roller body and two lateral bulges symmetrically arranged on the roller body. The method for improving the center segregation and porosity of the continuously cast plate blank comprises the following steps of carrying out pressing-down treatment on the continuously cast plate blank entering a secondary cooling zone by adopting a pulling-straightening machine with the convex foot roller. The convex foot roller for continuously casting the plate blank can be used for pressing down the continuously cast plate blank in a targeted manner in the form of a solidification zone during a solidification last phase; molten steel containing an enriched segregation element in the continuously cast plate blank is effectively stopped from flowing to accordingly weaken the center segregation and meanwhile, the solidification contraction amount of the continuously cast plate blank is compensated to lighten the center porosity of the continuously cast plate blank.

Description

technical field [0001] The invention belongs to the technical field of slab production, and in particular relates to a protruding foot roll for slab continuous casting and a method for improving center segregation and loosening of continuous casting slab. Background technique [0002] Continuous casting slab reduction in the secondary cooling zone is an effective technology to improve continuous casting slab center segregation and porosity. The molten steel flow of the elements weakens the center segregation, and at the same time compensates the solidification shrinkage of the continuous casting slab to reduce the center porosity. The applied pressure is mainly mechanical stress, and the amount of reduction is an important parameter to determine how much reduction is performed. [0003] With the increase of the cross-sectional size of the billet, on the one hand, the volume compensating for the solidification shrinkage increases significantly, and the extrusion deformation ...

Claims

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Application Information

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IPC IPC(8): B22D11/12
CPCB22D11/1206
Inventor 谢鑫吴国荣曾建华马晓涛
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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