This study conducted two process routes and four passes of cold rolling deformation and annealing treatment on pipes. The microstructure, grain size, and mechanical properties at room temperature were characterized using optical microscopy (OM) and room temperature stretching. The results showed that after cold rolling and heat treatment at 700？C/3 h, the microstructure of the tube was completely recrystallized and underwent a certain degree of growth. Cold rolling deformation can effectively improve the strength of the pipe. Under process route 1, there is a certain degree of non-uniformity in the deformation of the pipe after each pass. With the increase of deformation passes, the microstructure non-uniformity is improved. After 4 passes of deformation, the grain size difference between the M-state center and edge of the pipe is 2.5 μm. Under the premise of a certain total deformation during rolling, process route 2 can effectively eliminate the unevenness of the pipe structure by increasing the deformation amount for 3 passes. After 4 passes of deformation, the grain size difference between the M-state center and edge of the pipe is 0.4 μm, and the M-state elongation rate for 4 passes is 5.5% higher than that of process route 1.
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