A Hensel-Spittel flow stress model of steel 20CrMnTi with strain 0 ~0.8 and strain rate 0-3 s

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at 800-1150 °C is established by analysis on hot continuous rolling process of round bar. With using finite element software LARSTRAN/SHAPE the simulation of process of steel 20CrMnTi with 8 pass rolling from 200 mm x 200 mm billet to ①90 mm round bar has been carried out to analyze the variation of stress

strain and temperature field

and rolling force and torque of rolling stock during process of rolling by round pass with curved side wall and round pass with straight-line side wall. Simulated results show that at round comer of stock the equivalent stress and equivalent strain are bigger and the temperature is lower than that at other region

so the defects easily occur at the comer of stock ； the precision of round bar rolled by round pass with curved side wall is slightly hig

her that by round pass with straight-line side wall.