The deformation characteristics in rolling process are analyzed through calculating the changes of tempera-ture,strain and external dimensions during the deformation process of H beam with bilinear hardened material model by taking HW300 × 300 as the typical case. The calculations are with the thinking of all process and calculation method of thermodynamic couple,process temperature is used as deformation temperature of rolled piece as well as the effects of uneven temperature of cross section are taken into full consideration so that the calculation results are more close to actual situations,which provide the reliable basis for process optimization. The calculation results showed that there was necking near the trigonum on waist of H beam due to inhomogeneous deformation,local deformation at flange end would cause preci-sion of flange width to change as well as rolling deformation work would transform into heat energy so that internal tempera-ture of rolled pieces would rise.
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