The inner cavity of the copper tube of this geometric shape can better fit the actual shape of the solidified blank shell in the crystallizer, so that the air gap between the shell and the copper tube is kept to a minimum, which is conducive to the rapid and uniform heat transfer of the crystallizer. Ensure that the thickness of the billet shell is uniform and sufficient thickness when exiting the lower mouth of the crystallizer. In addition, the material of the water jacket and the positioning card is stainless steel to avoid the influence of corrosion and ensure the integrity of the dimension during the life cycle; the water jacket adopts the overall tubular structure design, the outer dimension of the copper pipe and the dimension of the inner cavity of the water jacket are more The inner cavity of the water jacket and the corners of the copper pipe are rounded, so that the cooling water flow rate between the water jacket and the copper pipe is uniform, which avoids the thermal and mechanical distortion and deformation of the copper pipe. The thermal deformation of the slab leads to the quality defect of the square of the slab.
The copper tube has good wear resistance and long life. The material of the copper tube is copper-silver alloy, which has good thermal conductivity, electrical conductivity, and magnetic permeability. It has higher yield strength and softening resistance than pure copper (generation) materials, and its recrystallization temperature Up to 350 ℃; the inner cavity of the tube wall is chrome plated, the thickness of the coating layer increases the wear resistance, and forms a smooth surface in the meniscus area to reduce the friction resistance in the mold; in addition, because of its good structural rigidity, it reduces the deformation due to deformation Increased frictional resistance. It can be seen that the diamond crystallizer has better wear resistance and can prevent surface cracks or star cracks caused by the direct contact of the billet shell with the wall of the tube. Judging from the actual service life of copper tubes, the amount of excess steel is currently determined as the average service life of the copper tubes of diamond crystallizers.
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