At present, domestic steel pipe manufacturers face the great challenge of overcapacity in seamless steel pipe, have adjusted the variety structure, eliminated backward production capacity and developed high-quality products. The experimental results show that the controlled cooling process in the hot rolling process of seamless steel tube can control the microstructure phase change process, refine the grain, and improve the mechanical properties of the steel tube.
Today about seamless steel tube hot rolling technology treatment!
Therefore, it is of great significance and application value to study the microstructure and properties of seamless steel tubes under different cooling systems after hot rolling. Due to the large profile section size and specification variation range of seamless steel pipe, the control and implementation of on-line heat treatment of seamless steel pipe are faced with many variables, which greatly restricts the implementation and application of cold control technology in the production of seamless steel pipe.
In order to realize the control cooling before straightening after diameter determination (reduction) in the production process of seamless steel tubes, scholars from yanshan university studied the microstructure and mechanical properties of no.20 steel tubes after rolling by means of numerical simulation. Firstly, the temperature variation curves of the steel probe under different cooling media were measured by experimental method, and the relationship between surface heat transfer coefficient and workpiece temperature in the cooling process of the steel probe was calculated based on the basic principle of reverse heat transfer method.
Then, the temperature field, microstructure phase change and force-energy performance prediction system in the cooling process of steel tubes were established by finite difference method, and the microstructure and mechanical properties of steel tubes under different cooling conditions were analyzed. Finally, the air cooling process of steel pipe is analyzed, and the temperature data and mechanical properties of the cold steel pipe at different times are measured. The calculated results are in good agreement with the measured data. The research results can provide basic data for the realization of seamless steel pipe cooling control.
