According to similarity ratio 1 ： 10

a simulation on rolling process of hot-rolled U-section steel sheet piling is carried out by using laboratory mill with test stock of lead and the relationship between rolling conditions and end bending of hot-rolled U-section steel sheet piling is obtained by change 4 kinds of rolling lubrication conditions and 5 kinds of velocity difference in 0. 6 ~ 1.0. Test results show that the bending degree produced in pass rolling is preliminarily caused by roll velocity difference

but the bending degree also changes with different rolling lubrication condition. In order to improve the bending defect caused by pass rolling process

as other rolling parameters keep constant

it is available to select 0. 65 roll velocity ratio combined with roller surface parameter in no-lubrication condition.