TET, through learning and mastering the USA advanced technologies of multi-high cold rolling mill, has developed twenty-high cold rolling mill, which can roll high precession carbon steel, aly steel, stainless steel and non-ferrous strip, the mill housing will be integrated casting steel structure. The separating force on working roll will be transferred to each backup bearing radically through intermediate rolls. There are hydraulic screw-down system, radial roll shape control system, axial roll shape control system and roll diameter compensation control system.

Hydraulic screw-down system (roll opening control). It will belong to backup bearing eccentricity screw-down mechanism and consist of two hydraulic cylinders which will be installed in the top of the mill. Link will drive rack engaged with sector gear installed on "B" and "C" backup bearings to make the bearings rotating.

Radial roll shape control system, it will consist of eccentricity gear installed on "B" and "C" backup bearing, hydraulic cylinder link and rack.. the cylinder will drive link and rack engaged with eccentricity gear installed on "B" and "C" backup bearings to make the bearing rotating for roll shape control to warrant the flatness of strip and widthwise thickness tolerance.

Axial roll shape control system, the opposite ends of top/bottom two pairs of first intermediate rolls will be machined as taper. They will be driven by hydraulic cylinder or electrical motor to shift axially opposite direction to change their coincidence length with working rolls for controlling edge shape of strip. Roll diameter compensation control system. It consists of four backup bearing("A" "H" "D" and "E") installed outside mill. The eccentricity cylindrical gears will be installed on them and driving these gears will be able to get purpose of roll diameter compensation control.