Control method of transverse corner cracks of casting blank of chamfering crystallizer

A technology of chamfering crystallizer and control method, which is applied in the field of continuous casting, can solve problems such as difficult control of corner transverse cracks, and achieve the effect of preventing corner transverse cracks and making up for shrinkage

Inactive Publication Date: 2016-03-23
SHOUGANG JINGTANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The embodiments of the present invention provide a method for controlling the transverse cracks at the corners of the slab of the chamfering mold, which solves the technical problem that the transverse cracks at the corners of the slab of the chamfering mold of the microalloyed steel are difficult to control in the prior art, and eliminates the Eliminates the transverse cracks at the corners of the chamfered mold slab and improves the quality of the slab

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  • Control method of transverse corner cracks of casting blank of chamfering crystallizer

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Embodiment 1

[0039] In the continuous casting process of micro-alloyed steel, the method of controlling the transverse cracks at the corners of the cast slab in the chamfering mold includes: controlling the first foot roll, the second foot roll, the third foot roll and the fourth foot roll The spray angle of the nozzle to the slab is 100°. Control the primary cooling water flow of the chamfering crystallizer narrow face to 540L / min. Control the cutting amount of the second foot roller, the third foot roller and the fourth foot roller to 3.5mm, increase the compression amount of the disc spring on the second foot roller, the third foot roller and the fourth foot roller by 1.3mm, and control the The thickness is 210mm. Control the water flow rate in the wide surface tank of the chamfering crystallizer to 8.1m / s, and control the fluctuation range of the water temperature in the chamfering crystallizer to 3°C. The amount of water distributed in the chamfering surface of the chamfering mold i...

Embodiment 2

[0041] In the continuous casting process of micro-alloyed steel, the method of controlling the transverse cracks at the corners of the cast slab in the chamfering mold includes: controlling the first foot roll, the second foot roll, the third foot roll and the fourth foot roll The spray angle of the nozzle to the slab is 107°. Control the primary cooling water flow of the chamfering crystallizer narrow face to 586L / min. Control the cutting amount of the second foot roller, the third foot roller and the fourth foot roller to 2.5mm, increase the compression amount of the disc spring on the second foot roller, the third foot roller and the fourth foot roller by 1.5mm, control The thickness of the slab was 225 mm. Control the water flow rate in the wide surface tank of the chamfering crystallizer to 8.5m / s, and control the fluctuation range of the water temperature in the chamfering crystallizer to 3.5°C. The amount of water distributed in the chamfering surface of the chamferin...

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Abstract

The invention relates to the technical field of continuous casting, in particular to a control method of transverse corner cracks of a casting blank of a chamfering crystallizer. The control method includes the steps that the spraying angle of spray nozzles on a first foot roll, a second foot roll, a third foot roll and a fourth foot roll relative to the casting blank is controlled to range from 95 degrees to 110 degrees; and the water flow of primary cooling water of the narrow face of the chamfering crystallizer is controlled to range from 520 L / min to 600 L / min. According to the control method of the transverse corner cracks of the casting blank of the chamfering crystallizer, the spraying angles of the spray nozzles on the first foot roll, the second foot roll, the third foot roll and the fourth foot roll relative to the casting blank are controlled to range from 95 degrees to 110 degrees, the cooling effect of the chamfering portion of the casting blank of the chamfering crystallizer for microalloyed steel can be fully guaranteed, and meanwhile the influence on the following process of the casting blank is avoided; and in addition, the water flow of the primary cooling water of the narrow face of the chamfering crystallizer is controlled to range from 520 L / min to 600 L / min, and the transverse corner cracks can be prevented from being generated on the casting blank of the chamfering crystallizer for the microalloyed steel.

Description

technical field [0001] The invention relates to the technical field of continuous casting, in particular to a method for controlling transverse cracks at the corners of a billet in a chamfering mold. Background technique [0002] The production cost of microalloyed steel is low, and microalloyed steel has excellent properties such as good strength, toughness, formability and weldability, and has been widely used in industrial production. In the production process of micro-alloyed steel, the crack defect at the corner of the slab has always been a key technical problem that plagues major steel mills at home and abroad, especially in the production of typical peritectic and sub-clad steels with a carbon content of 0.08% to 0.20%. In the case of crystalline microalloyed steel, the occurrence rate of the edge defects of the plate and strip caused by the transverse cracks at the corner of the slab is generally more than 5%, and even can reach more than 80% in severe cases. In th...

Claims

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Application Information

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IPC IPC(8): B22D11/16
CPCB22D11/16B22D11/001
Inventor 杨春政李金柱田志红彭国仲杨春宝王莉王胜东刘占锋王保生乔焕山
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD
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