The PQF (Premium Quality Finishing) tube mill has been the most technologically advanced continuous-rolling tube mill so far. The mandrel is one of the main tools for processing in PQF, the temperature distribution and variation of which is the basis of studying the abrasion and defect generation of mandrels. Finite element method is applied to obtain the temperature field of every phase and the temperature history in PQF rolling tube 28CrMo57. The results show that the surface nodes are always in high temperature while the temperature of internal nodes almost maintains original value; the surface temperature of the mandrel changes dramatically, and the temperature reduction rate reaches 160°C/s between the 1# stand and the 2# stand; the average temperature of the whole mandrel rises fastest in the 1# stand, whereas the rate of rise slows down considerably in the subsequent phases. After comprehensive consideration of simulation results and failure mechanism of the mandrel, some suggestions on prolonging mandrel life are presented.

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