With established calculated spread model for test medium and heavy plate rolling process

the predicted calculation on rolling load for steel Q345 (/% : ≤0.20C

≤1.60Mn

≤0.55Si) in each rough rolling pass by 10 passes rolling from 210 mm casting slab to 48 mm plate has been carried out and the effect of test spread model and Besse spread model on medium and heavy plate rolling load is analyzed. Results show that in medium and heavy plate initial 2 and 3 pass and last 9 and 10 pass the predicted precision of rolling load calculated by test spread model is higher

its relative error is 0. 26% ~0. 68%

in 4 ~ 8 passes the predicted precision of rolling load calculated by Besse spread model is higher

its relative error is 0. 33%~11. 79%

and for the two models all the relative error in first pass is 18. 00%.