Prediction and Software Development of Microstructure and Properties of Hot Rolled Steel Plates

On the basis of thermodynamics and kinetics,the microstructure-property prediction system was developed and successfully applied at Shougang plate plant.The variation of yield strength and tensile strength of steel plate with process parameters can be predicted.The predicted results are in good agreement with measured ones.The transformed ferrite volume fraction increases and grain size decreases with the increase of cooling rate.With the increase of steel plate thickness,the average ferrite grain size increases and the change of ferrite volume fraction is(very) small.When the thickness of intermediate rolling piece is two times of final product,good strength and superior toughness can be obtained.