A systematic mathematical model group has been developed to simulate the billet section temperature distribution

austenite structure evolution and products properties. "Die prediction system for structure and properties is established based on the sub-models determined by test including critical model

austenite recrystallization

phase transformation in steel at Stelmor cooling line and relation between structure and mechanical properties to couple temperature fields of billet. Hie billet temperature at key point of rolling production line

austenite grain size rating and mechanical properties calculated by this system are in agreement with measured value at situ.