How to improve the use efficiency of copper mold tube?copper mold tube is a very important component, which plays the role of liquid steel condensation. Its

How to improve the use efficiency of copper mold tube?

copper mold tube is a very important component, which plays the role of liquid steel condensation. Its quality has a direct impact on the quality of the blank and has a great impact on its own life. In the process of continuous casting, thermal deformation often occurs due to contact, corrosion and friction between the inner wall coating of copper tube and high-temperature molten steel. And the damage of the inner surface coating. Affect the operation efficiency of continuous caster. It affects the quality of casting blank. Therefore, it is necessary to ensure the quality of copper mold tube, improve the service life, and improve the working quality and efficiency of continuous caster.

Many copper mold tube manufacturers are trying to improve their service life.

1. From single cone to multi cone design of the inner wall of copper tube, and then to parabola surface. From the perspective of copper tube raw materials, from pure copper, phosphorus copper to silver copper and chromium zirconium copper. Promote thermal conductivity and improve deformation resistance and service life. However, the traditional process of hard chromium coating is still used in the coating of the inner wall of copper mold tube. The chromium plating layer has high hardness and good wear resistance, but the coating is thin and has fine cracks.

In addition, the thermal expansion coefficients of chromium and copper are quite different. More transverse cracks will appear when used at high temperature. In the process of continuous casting, molten steel penetrates into the copper surface through cracks, which makes it produce more cracks. Therefore, in the long-term corrosion of molten steel, the chromium plating layer will appear pulverization and falling off, and its wear resistance will be greatly reduced. In the process of casting, the chromium plating layer will be worn off quickly, so the wear resistance of chromium plating layer is very limited and its service life is relatively short.

How to solve this problem? In order to improve the wear resistance of chromium coating and prolong the service life of copper mold tube, nickel cobalt alloy coating is added on the surface of chromium coating and copper mold tube as transition layer. Therefore, it is called nickel cobalt alloy hard chromium coating because nickel cobalt alloy coating has good corrosion, heat erosion and wear resistance. It plays the role of bond between the inner surface of copper mold tube and chromium plating layer, which greatly improves the wear resistance of chromium plating layer. In addition, the nickel cobalt alloy coating can continue to work after the chromium coating is worn, so as to prolong the service life of the copper mold tube.