According to the buckling defects of hot rolled U-section sheet pile ( steel SY390BZ /% : 0.23C

1.60Mn

0.44Si

0.18V

0.18Ti

0.05Nb) formed during rolling process

the numerical-simulated calculation on finishing process of sheet pile has been carried out by using the dynamic-explicit-calculated method of finite element software ABAQUS and combined with experimental-measured parameters in lab. Based on simulation calculation

according to the distribution of node displacement vector on rolling plane

the rule of metal flow pattern of lateral and longitudinal section is analyzed. Simulation results show that there are zero displacement lines on work-piece section in pass reduction direction

it indicates there is a neutral flow plane for work piece metal flow in rolling force direction at flange and locker of U-section sheet pile work piece in rolling process

in company with fast flow of metal at locker flange and slow flow of metal at web of work piece thus to occur buckling phenomenon.