Continuous cooling transformation behavior of austenite of high properties rare-earth-microalloyed BTP500 steel plate was studied to clarify the phase types obtained under different cooling rates and the specific conditions for obtaining martensite of the designed BTP500 steel plate,and then to carry out small scale industrial trial production.The results show that the transformations of ferrite+pearlite(A→F+P),bainite(A→B)and martensite(A→M)occurr respectively during the continuous cooling process of the RE microalloyed BTP500 steel plate under different cooling rates.The critical cooling rate of BTP500 steel plate to obtain complete martensite is determined as 7 ℃/s by the CCT curve.Microstructure of industrial trial produced BTP500 steel plate by quenching at 780 ℃ and tempering at 210℃ is martensite,the mechanical properties meet the technical requirements and the comprehensive performance is excellent.
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