The numerical-simulation on blooming and rolling process with 5 passes of BD2 mill at 1 200 °C for heavy rail steel U75V (/% : 0. 70 〜0. 78C
0.50 〜0. 70Si
0. 75 ~1.05Mn
≤0.025P
0. 008 〜0. 025S
0. 04 〜0. 08V) has been carried out by using nonlinear finite element software ANSYS/LS-DY
and the distribution of equivalent stress and equivalent strain at stable-section of rolling piece in each pass is analyzed. Results show that with change of each pass the distribution of stress and strain in head
waist and bottom of rolling piece is deferent ; it is obtained by analysis on rail head
waist and bottom at stable-section of rolling piece that the change of stress in head is largest
its maximum value is up to 64. 8 MPa
so increasing the yield strength of head of heavy rail is available to prolong the life of heavy rail.