The effect of 230 mm x (1 580 ~ 1 780) mm cast slab rough rolling slab 100 ~300 mm width sizing press and 2~6 pass reduction partition of 700 MPa Ti micro-alloyed high-strength steel (/% ：0. 05 ~0. 07C

0. 05 ~ 0. l0Si

1. 10~1. 25Mn

0. 075 ~ 0. 095Ti) on the final 10 mm plate microstructure is studied. The results show that the inhomogeneity of microstructure will become more obvious when the extent of slab sizing press increases

as well as the size of the banded structure of ferrite well increase

and the tensile lamination cracks occurred trend will increase too. It also shows that the microstructure will be more uniform when the rolling reductions of different passes are uniform. The slab sizing press a- mount has more influence on the uniform of the microstructure than the rolling reduction partition of different passes. The i- deal process should be with the slab width sizing ≤100 mm and the single rolling reduction ≥20%.