Subgrain and micrograin structures of Q235 steel were obtained by the process of equal channel angular pressing (ECAP) at room temperature with the route Bc that samples were rotated 90(and kept the direction unaltered after ECAP. The microstructure evolution of four surfaces was observed after ECAP deformation. It is shown that the microstructure of ECAP deforming Q235 steel is thinned with the increase of deformation pass, and the thinning degree of the first pass is the greatest. The appearances of four ...