Method for preventing longitudinal crack breakout of continuous casting slab

A technology of longitudinal cracks and slabs, which is applied in the field of continuous casting slab longitudinal cracks and breakouts, can solve problems such as too thin slab shells, breakouts, longitudinal cracks, etc., to avoid longitudinal cracks, improve online service life, and reduce downtime the effect of time

Pending Publication Date: 2021-08-20
CHONGQING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a method for preventing the longitudinal crack breakout of the continuous casting slab, which is used to solve the problem that the continuous casting slab is prone to excessive slab shell near the corner in the prior art. Leakage due to thin or longitudinal cracks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] When a steel plant is poured 250 mm × 2000 mm continuous casting slab, when the method of the present invention, when the method is assembled, the plane of the narrow copper plate is controlled at less than or equal to 0.5 mm, and the present embodiment is 0.5 mm; The plane of the large chamfered copper plate is controlled in less than or equal to 0.5 mm, and the present embodiment is 0.5mm; the large chamfer copper plate needs to ensure that the inverted calibration contraction meets the design requirements, and cannot be used due to the narrow backplane and the water tank clearance. The sealing circuit causes the back to the back to the copper plate to be reduced. The plane of the narrow back plate is controlled at less than or equal to 0.3 mm, and the present embodiment is selected from 0.3 mm; the detection can be guaranteed by defining the diaspore copper plate, a large chamfer copper plate, and a narrow back plate. The accuracy of the inverted calories.

[0035] The g...

Embodiment 2

[0045] When a steel plant is poured 230 mm × 1530 mm continuous casting plate, when the method of the present invention is assembled, the narrow copper plate is 0.3 mm, and the plane of the narrow back plate is 0.3mm. The slit between the narrow backplane and the holding plate is 0.4 mm.

[0046]The relative position of the wide facial roller and the wide surface copper plate is configured to protrude from 0.5 mm / per side of the wide facial roller. When the crystallizer is assembled, the angular dimensions between the wide-plane copper and the narrow copper plate are 0.15 mm. When the crystallizer is used, the corner sizes between the wide surface copper plate and the narrow copper plate is 0.3 mm.

[0047] The clamping force of the dish spring is greater than the projection of the drum force and the friction between the inner arc water tank and the seat plate.

[0048] When pouring the sub-coated steel, the coated steel pulled by 1.00 to 1.65 m / min, the inverted calories of t...

Embodiment 3

[0054] When a steel plant is poured with a 300 mm × 2250 mm coil, a steel plant is assembled when the method of the present invention, the crystallizer is assembled, the narrow surface large chamfer copper plate is 0.5 mm, and the straightness of the narrow back plate 0.3 mm, the slit between the narrow backplane and the holding plate is 0.5 mm.

[0055] The relative position of the wide facial roller and the wide surface copper plate is configured to protrude from 0.3 mm / per side of the wide facial roller. When the crystallizer is assembled, the corner sizes between the wide-plane copper plate and the narrow copper plate is 0.15 mm; when the crystallizer is used, the corner sizes between the wide surface copper plate and the narrow copper plate is 0.2 mm.

[0056] The clamping force of the dish spring is greater than the projection of the drum force and the friction between the inner arc water tank and the seat plate.

[0057] When pouring the Asia-coated steel, the coated stee...

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PUM

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Abstract

The invention provides a method for preventing longitudinal crack breakout of a continuous casting slab. The method comprises the steps that, the straightness of a narrow-surface copper plate of a crystallizer, a large-chamfer copper plate and a narrow-face back plate is defined; the relative positions of a wide-surface foot roller and a narrow-face foot roller to the copper plate are defined; the size of an angle seam between a wide-surface copper plate and the narrow-surface copper plate of the crystallizer is defined; the back taper of the wide-surface copper plate and the narrow-surface copper plate of the crystallizer is defined; and the precision of a crystallizer vibration unit is defined. According to the method, online service life of the copper plate of the crystallizer is prolonged, the belly bulging amount of the narrow surface of the continuous casting slab is controlled, longitudinal crack breakout of the corners of the slab is avoided, the downtime of a casting machine due to crystallizer replacement and the like is shortened, the operation rate of the casting machine is improved, and smooth production of a steel rolling interface is ensured.

Description

Technical field [0001] The present invention belongs to the field of metallurgical continuous casting techniques, and more particularly to a method of preventing the leakage steel of the continuous casting slab. Background technique [0002] During the production of slab coil, the width, the corner of the crystallizer, the corner portion of the narrow-faced intersection, the steel flow field and the coagulation conditions are complex, the blank shell is in two-dimensional heat, and when the carbon coated steel is poured, it is solidified The initial shrinkage is high, the crack is strong, the blank shell in the vicinity of the steel liquid in the rear corner portion of the crystallizer is often weak, and the blank shell of the slab is thinner. If the foot roll is poor, it will exacerbate The external force of the primary billet is aggregated here; the angle of the crystallizer is easily caused by the steel liquid sewing seam, and the corner tank has destroyed the integrity of the...

Claims

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Application Information

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IPC IPC(8): B22D11/16
CPCB22D11/16
Inventor 何宇明徐书强张朝映凌代万刘渝
Owner CHONGQING IRON & STEEL CO LTD
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