1. The incoming materials of the intermediate rolling mill have good smoothness, and the difference between the upper and lower sides is controlled within 2mm. The incoming materials of the 7# machine should avoid the phenomenon of large heads and large tails.
2. The material type error of each finishing rolling is controlled within 0.2mm.
3. Key points for material type control: K5 material type cannot be wrong with the roller, and the filling is good to ensure the accuracy of pre-cutting; K3 and K4 must ensure good rollers to prevent the rolled piece from twisting, causing cutting deviation or uneven cutting or punching the K3 exit.
4. The east-west gap of the finishing rollers of all sets must be equal, especially the east-west gap of the K3, K4, and K5 rollers.
5. The incoming materials of the three rough rolling passes are controlled within ±1mm, and the diagonal difference is ≤2mm. The incoming materials of 7# are controlled within 7#±0.5mm, and the difference between the upper and lower sides is only within ≤2mm.