At present, domestic steel pipe manufacturers are facing the huge challenge of seamless steel pipe overcapacity, adjusting the variety structure, eliminating backward production capacity, and developing high-quality products. The experimental results show that the controlled cooling process during hot rolling of seamless steel tube can control the transformation process of microstructure, refine grain size and improve the mechanical properties of steel tube.
   

Today's treatment of hot rolling technology for seamless steel tubes!

Therefore, it is of great significance and application value to study the structure and properties of seamless steel tubes under different cooling systems after hot rolling. Because of the large variation of section size and specification of seamless steel tube, there are many variables in the control and implementation of online heat treatment of seamless steel tube, which greatly restricts the implementation and application of cold control technology in production. Seamless steel tube.

In order to realize the controlled cooling of seamless steel tube before straightening after diameter measurement (reduction) in the production process, scholars of Yanshan University have studied the structure and mechanical properties of 20 steel tube after rolling through numerical simulation. Firstly, the temperature curves of steel probe in different cooling media were measured by experimental method, and the relationship between surface heat transfer coefficient and workpiece temperature during cooling process of steel probe was calculated according to the basic principle of reverse heat transfer. Method.

Then, the finite difference method is used to establish the prediction system of temperature field, phase transformation and mechanical-energy performance of steel tube during cooling process, and the microstructure and mechanical properties of steel tube under different cooling conditions are analyzed. Finally, the air-cooling process of steel tube is analyzed, and the temperature data and mechanical properties of steel tube at different time are measured. The calculated results are in good agreement with the measured data. The research results can provide basic data for cooling control of seamless steel tube.