Composite roller for two cooling regions of conticaster

Abstract

A dcomposite roller used in the second cooling regine of a conticaster is composed of roller body, sleeve pipe, and water inlet and outlet tubes, and it features that the cooling water lsots are uniformly made on the surface of roller body in circumference direction, the water distributing holes are radically made on the roller body, an annular water-distributing tube is connected between the radical water tube and the cooling water slots, and the said sleeve pipe of roller body is made up of Cr-Zr-Cu alloy. Its advantages are high cooling efficiency, uniform cooling temp and high quality of castings.

Description

technical field [0001] The invention belongs to a backup roll for a continuous casting machine, in particular to a composite roll for the second cooling zone of the continuous casting machine. Background technique [0002] The casting billet pulled out from the mold solidifies into a thin shell, while the center is still high-temperature molten steel, forming a long liquid phase cavity. A water spray cooling zone is the secondary cooling zone. There is a water spray system and a series of nip rolls in the secondary cooling zone. These backup rolls mainly play a role in clamping and guiding the billet, so that the billet will not be bulged and deformed during operation, and the cooling of the billet will not be affected. play a significant role. The cooling of the billet is mainly achieved by water spray, but this cooling method, whether it is pressure water or gas-water, has factors that are not conducive to the billet and cannot be completely solved. ①Because the surface...

AI Technical Summary

Problems solved by technology

The cooling of the slab is mainly realized by spraying water, but whether this cooling method is pressure water or air-water, there are factors that are not conducive to the slab and problems that cannot be completely solved

①Since the surface temperature of the slab in the secondary cooling zone is as high as 1100°C, the steam film formed rapidly on the surface of the slab will prevent the sprayed water droplets from contacting the slab, which limits the efficiency of water spray cooling; ②Using water cooling, the surface of the slab is cooled Inhomogeneity will cause the temperature of the slab shell to rise, making the slab prone to middle cracks or subcutaneous cracks

In production, cooling methods such as multi-stage crystallizer, cooling grid, and cooling plate are used. Although the cooling conditions are improved, the friction between the billet and the device increases, the resistance of the billet drawing increases, the manufacturing is complicated, and the maintenance is difficult. And other issues

The above problems restrict the development and production of special steel grades cast by existing continuous casting machines

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