Abstract: With the ABAQUS FE software, analog simulation analyses are conducted to the rolling of the limitsized light-wall pipes with the 3-roll and 4-roll mandrel mill processes.And the simulation result is comparatively verified with Code McClintock.As a result, it is identified that under the same deformation conditions, and compared with the 3-roll mandrel mill process, ductile fracture is rare to occur when adapting the 4-roll mandrel mill process;and that given the pipe limit D/S is 51 in case of using the 3-roll mandrel mill process, the new 4-roll mandrel mill process is capable of producing pipes with D/S up to 60.