Abstract:Pilger cold rolling technology,as the most important technical means of cold-rolled seamless metal tube,has the characteristics of high material utilization,large cross sectional deformation and high machining accuracy 304 stainless steel rolled by LG-60 pilger mill was taken as the object of study and a numerical simulation model was established.With metallographic microscope,scanning electron microscope and X ray diffractometer,the evolution of the organization in the process of cold rolling steel was analyzed from the different deformation segments of the pipe.The results showed that the technological parameters can meet the requirements of plastic deformation of the tube.But in the rolling process,it is likely to form cracks or other defects during rolling.Therefore,key parameters such as rolling force,tube equivalent stress and residual stress during cold rolling simulation of pilger were analyzed and obtained.The optimal process parameters based on feed volume,back angle and Q value were obtained.It was also found that a large amount of dislocations were produced in the sample during the rolling process.The grain was broken and the size decreased.In the process of rolling,there was the transformation of austenite phase to alpha-martensite phase.