Recently, Bensteel's plate hot rolling mill broke through the rolling thickness limit and successfully rolled 28mm thick Q235C steel in one trial. This product will be specially supplied for piling pipes and spiral welded pipes. At present, the plant is conducting functional tests such as stretching, cold bending, and impact on the new products to provide technical support for subsequent mass production.
In order to meet customers' demand for 28mm thick hot-rolled coils, the plant carried out special trial rolling on the 2300 production line and formulated a detailed trial production plan, implementing each item from raw material inspection, pre-rolling preparation, production planning to rolling process, focusing on controlling the quality of the slab to ensure uniform and straight thickness; simultaneously, the multi-function instrument was tested on samples to ensure thickness measurement accuracy, and by optimizing the secondary computer model, it laid the foundation for the successful trial rolling of ultra-thick products.
Faced with the original design of the production line with an upper thickness limit of 25.6 mm, the technical team overcame multiple difficulties in model setting, equipment load, coiling and forming, and through a "carpet-style" investigation of the limits of each control unit in the system, a total of 28 key limit points have been expanded and modified, breaking through the bottleneck of model operation. In the absence of mature data reference for products with a thickness of 28 mm, the technical team built an extended deduction model based on existing specification parameters. Through multiple rounds of simulation calculations, data regression and parameter optimization, a setting algorithm adapted to ultra-thick specifications was established, which effectively guaranteed product accuracy. At the same time, for the coiling area, the system debugged more than 100 key parameters such as the front and rear slip of the output roller, the pressure of the pinch roller, and the compensation of the forming roller gap, focusing on strengthening the full-process dynamic control of the tension and torque values, achieving a "double improvement" in coil shape accuracy and forming stability, and ensuring the success of the first round of trial rolling.