How is the production technology for seamless square tubes?

Square tubes are a vital type of steel, commonly used, yet they have not been fully utilized. With the advancement of technology, this situation can be greatly improved. The price advantage of square tubes lies in the fact that thin specifications cannot be produced by hot rolling, and the beautifully profiled thin-walled complex cross-sections are exclusive. In some applications, such as in automobiles, tractors, and railway vehicles, square tubes are required for their lightweight properties.

Our existing square tube production lines should be gradually improved based on their existing anomalies. In line with the current situation, square tube prices are slowly being adjusted. By absorbing excellent techniques and equipment from both domestic and international markets, we are exploring new products, new processes, and enhancing the quality of our equipment. Under minimal investment, we may continue to expand our product range and improve product quality.

One aspect of Fangguan's growth is to continuously meet various application needs, with Fangguan prices offering multiple functionalities in products. Materials for electrical control cabinet columns and shelving require pre-punching holes before forming. Considering the high requirements for hole spacing and geometric patterns, significant deformation during the bending process is not acceptable. Therefore, the simulation research and control methods for the deformation of pre-punched holes on cold bending machines are of great importance.

Simulated the processing process using computational simulation software, compared the on-site examination secrets with the computational simulation secrets. Based on the process drawings, the secrets were simulated, and the deformation level of the material cross-section was displayed using cloud maps and curves, laying a solid foundation for further understanding the deformation rules during the rolling process.

Large rectangular tube rolling demands higher technical expertise and process conditions. As large rectangular tube manufacturers, when producing large rectangular tubes, it is essential to prepare meticulously from several aspects, appropriately dominate various factors affecting the production process. Appropriate reduction distribution is crucial. The incoming blank thickness for the BD rolling mill should be reduced as much as possible, which not only helps to minimize the deformation of the web and flanges during full-scale rolling but also facilitates the correct sizing of the flanges at the head and tail sections of the rolled parts.

The preliminary reduction of the side plate on the all-steel mill's first pass requires increased rolling force, with the stand roll under relative pressure reduction; the intermediate pass achieves balanced rolling force between the horizontal roll and the stand roll; the last two passes involve the side plate under reduced pressure with lower rolling force, ensuring the flange elongation is greater than the side plate, resulting in tensile stress on the side plate.

The reduction of web temperature can be approached from both rolling and cooling aspects. The geometric dimensions of the rolled piece should adhere to the positive deviation of the web thickness and the negative deviation of the flange thickness during rolling. Additionally, the web of square rectangular tubes requires a certain degree of reduction in the last two passes to compensate for the temperature drop by possibly forming deformation heat.