Controlled Rolling and Cooling Process Optimization of Non-annealed 12Cr1MoV Wire Rod Products for Boiler Flat Steel
In order to develop non-spheroidizing annealing 12Cr1MoV hot rolled wire rod,based on deformation induced phase transition mechanism,the finishing rolling temperature of 830℃and laying temperature of 800℃were adopted.By inhibiting deformation austenite grain recovery and recrystallization process,increasing deformation energy storage,thereby promoting austenite decomposed into ferrite and pearlite.Meanwhile in stage controlled cooling was realized with adjusting the air-cooled roller speed,the quenching microstructures were completely eliminated because prolonging the holding time between 630℃and 750℃.The test results are that the tensile strength of 12Cr1MoV hot-rolled wire rod was reduced from 576 MPa to 520 MPa,while reduction of area increasing from 66%to 74%.The elimination of quenched mi-crostructure significantly optimizes the deformation ability of wire rod,and also avoided holes in the cross-section center or draw break which caused by a small or minimal martensite microstructure are unable to cooperate with deformation.Plas-tic cracking has not occurred after batch use of multiple specifications by users.