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

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...

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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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