How to improve the use efficiency of mold copper tubes?The crystal copper tube is a very important part, which is responsible for the condensation forming of m

How to improve the use efficiency of mold copper tubes?

The crystal copper tube is a very important part, which is responsible for the condensation forming of molten steel. Its quality directly affects the quality of the blank, and also has a great impact on its own life. In the continuous casting production process, the inner wall coating of the copper pipe is in contact with high temperature molten steel, corrosion, friction and other reasons often thermally deform. And the damage of the inner surface coating. Affect the operating efficiency of the continuous casting machine. Affect the quality of casting blanks. Therefore, the quality of the mold copper tube is guaranteed, the service life is increased, and the working quality and efficiency of the continuous casting machine are improved.

  Many crystal copper tube manufacturers are working hard to explore and improve their service life. 1. From the single cone of the inner wall of the copper pipe to the multi-cone design, and then develop to the parabolic surface. From the perspective of copper pipe raw materials, from pure copper, phosphor copper to silver copper and chromium zirconium copper. Promote thermal conductivity, improve resistance to deformation and life. However, the traditional process of hard chromium plating is still used in the plating of the inner wall of the copper pipe. The chrome plating layer has high hardness and good wear resistance, but the plating layer is thin and has fine cracks.

  Another point, the thermal expansion coefficient of chromium and copper are quite different. More lateral cracks will appear when used at high temperatures. In the continuous casting process, the molten steel penetrates the copper surface through cracks, causing it to produce more cracks. Therefore, during the long-term corrosion of molten steel, the chromium plating layer will appear chalking and falling off, and its wear resistance will be greatly reduced. The chromium plating layer is quickly worn away during the casting process, so the wear resistance of the chromium plating layer is very limited. , The service life is relatively short.

  How to solve this problem, in order to improve the wear resistance of the chromium plating layer and prolong the service life of the crystal copper tube, a nickel-cobalt alloy plating layer is added to the chromium plating layer and the crystal copper tube surface as a transition layer. Therefore, it is called nickel-cobalt alloy-hard chromium coating because the nickel-cobalt alloy coating has good corrosion, heat corrosion and wear resistance. It acts as a bonding agent between the inner surface of the crystal copper tube and the chrome-plated layer, which greatly improves the wear resistance of the chrome-plated layer. In addition, after the chromium plating layer is worn out, the nickel-cobalt alloy plating layer can continue the work of the chromium plating layer, which extends the life of the copper tube of the mold.