The Study Of Mathematical Model For Cooling Control Of Q345B After Rolling With High Density Pipe Lamina Flow And Prediction Of Structure And Property

In this paper, a mathematic control model used in accelerated cooling process and predicted microstructure and mechanical properties of Q345B steel was bring forward according to the characteristic of the new built high denseness pipe laminar flow device in the Rolling Steel Plate Mill of WISCO.The mathematic control model was introduced including a different expression and some models for predicted cooling pattern of laminar flow/ ultimate cooling temperature in every predicted cooling pattern/ultimate cooling temperature modified way and self learning. By comparing with measure data, good predict precision of the model is proved. The ratio that the temperature after controlled cooling fluctuates within ±15℃ when compared with the aimed temperature is higher than 95%. Combined with Q345B steel, using mathematical model simulating the structural evolution, predict the mechanical properties during accelerated cooling process. The factors which affect the structural evolution and mechanical properties are also given.