Cooling device for preventing surface of continuous cast billet from being cracked

Abstract

The invention relates to the technical field of cooling equipment and provides a cooling device for preventing the surface of a continuous cast billet from being cracked. The cooling device comprises a high-speed cooling section, an air cooling temperature return section, a low-speed cooling section, a framework, a cooling water-spraying unit, a position and temperature detecting unit and a control unit. The cooling water-spraying unit and the position and temperature detecting unit are connected with the control unit. Spraying nozzles are disposed on the framework. Cooling water pipelines are disposed along the framework. A water pressurizing device is connected with the spraying nozzles through the cooling water pipelines. Position probes are located at an inlet of the high-speed cooling section, and temperature probes and the spraying nozzles are arranged in the same positions. The position probes and the temperature probes are all connected with the control unit. The cooling device for preventing the surface of the continuous cast billet from being cracked has the beneficial effects that the cast billet passes through the high-speed cooling section, the air cooling temperature return section and the low-speed cooling section, and dynamic control over cooling water flow and pressure is achieved through position and temperature feedback; and the surface structure of the cast billet is improved through the cooling and temperature return process, the strength and plasticity of a surface layer are improved, and the surface of the cast billet is prevented from being cracked in the subsequent process.

Description

technical field [0001] The invention relates to the technical field of cooling equipment, in particular to a cooling device for preventing continuous casting slab surface cracking. Background technique [0002] The problem of surface cracks has always been accompanied by the development of continuous casting technology. Once the surface of the slab is cracked, it needs to be finished in mild cases, which increases the process and cost, and in serious cases, waste products will be generated and serious losses will be caused. The formation of cracks on the surface of the slab is closely related to the continuous casting process. Since the slab is crystallized sequentially in the crystallizer, a temperature gradient will be formed in the direction of casting and thickness. State, due to solidification, the metal shrinks toward the center, causing the surface to be subjected to tensile stress toward the center of the slab. At the same time, the cast slab undergoes phase transfo...

AI Technical Summary

Problems solved by technology

[0002] The problem of surface cracks has always been accompanied by the development of continuous casting technology. Once the surface of the slab cracks, it needs to be finished in mild cases, which increases the process and cost, and in severe cases, waste products will be generated and serious losses will be caused.

As well as the immersion pool or immersion cooling bed used by iron and steel enterprises in Germany, Japan, South Korea, etc., the whole casting slab is immersed in the pool to cool through the lifting device. The whole set of equipment occupies a large area and the maintenance cost is high, so it is not suitable for domestic enterprises. use

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