Processing and Electroplating Treatment of Q345B Seamless Steel Pipe The key to the electroplating process for Q345B seamless steel pipe production involves the entire process, including preliminary treatment, electroplating technology, and post-treatment. The quality of the coating depends on the electroplating process of the raw material, which is influenced by many factors. Below are the six main factors: 1. Zinc Content: The higher the purity of the zinc block, the narrower its brightness range, making it easier to achieve a thicker coating on the seamless square tube automotive sheet. The iron content in the coating of the 20# seamless square tube at the application temperature will also be lower; when the purity of the zinc block is too low, the brightness range is wider, and a thicker zinc layer requires more time, which can cause a higher iron content in the hot-dipped zinc layer. 2. Sodium Hydroxide Solution: Sodium hydroxide solution has a bidirectional effect on the reaction. When its concentration is too high, a burn situation may occur during the high-temperature operation process of the 20# seamless square tube - Q345B seamless steel pipe - seamless tube cutting processing - Shandong Langnai Metal Products Co., Ltd. When the concentration is too low, the dispersion ability of the aqueous solution is weaker, which can reduce the quality of the zinc layer. 3. Iron Content: When the iron content is too high, there will be more iron in the coating, causing the product's passivation film to lack luster. Too low iron content can cause the iron content in the hot-dipped zinc layer to be lower, reducing the corrosion resistance of the automotive sheet and causing the surface to be olive green. 4. Polishing Solution: The polishing solution commonly used is a mixture of ZF-100A and ZF-100B. The high concentration of the former increases the coating's ductility, while the low concentration can cause the coating in the low current density area to be sparse, leading to uneven passivation. 5. Temperature: Too high a temperature in the electroplating process reduces the dispersion ability of the solution, increases the iron content in the coating of the 20# seamless square tube at the application temperature, and causes uneven passivation. Too low a reaction temperature can easily cause burning in the high current density area, with the coating having high ductility and slow accumulation rate. 6. Cathode Movement Rate: It is necessary to ensure that the cathode is in a moving state during the electroplating process. If the movement speed is too fast, the coating in the high current density area will be rough. A slow movement speed may cause eddies, leading to uneven coating on the material. Production and Deformation of Q345B Seamless Steel Pipe In addition to tensile deformation, Q345B seamless steel pipe can also undergo extrusion deformation. Generally, it is necessary to pay attention to performing the operation on a professional cold drawing machine. The raw material after cold drawing flat steel should be noted that the material properties of the Q345B seamless steel pipe will be better. To achieve a better application effect of Q345B seamless steel pipe, some strengthening treatments will be required after the large-diameter seamless steel pipe. Strengthening treatments for Q345B seamless steel pipe also include material treatment. Currently, the materials used all have relatively high specifications for raw material precision. The processing conditions will decide the precision and surface luster of the finished product after processing based on the specification selection of the raw material. Generally, raw materials larger than the required product diameter specifications will be selected for processing.