In order to meet the needs of the shipbuilding industry and the production of large diameter longitudinal welded pipe, Japan, Germany, Russia and other countries have built a number of more than 5 meters of extra-wide plate mill. At present, Japan has been able to produce 5350mm wide and 380mm thick steel plates with a single weight of 200 tons.

At present, the newly-built and under construction overseas special wide plate rolling mills of more than 5 meters mainly use single stand form, and the raw materials are large slabs or large steel ingots. Some of them also have roller mill trimming and width control attached to the rolling mills, such as 5490mm vertical roller proximity rolling mills in Japan's Mizushima Factory, 5500mm vertical roller non-proximity rolling mills in Dagu Factory and 5350mm 4830mm vertical roller non-proximity rolling mills in Kashima Factory. In addition, foreign newly-built factories are considering setting up a digital information control cutting line. The main equipment includes a shape meter, an automatic marking machine, a head cutter, a bilateral cutter and a fixed-length cutter, which greatly improves the cutting accuracy. The plate width deviation can be increased from the current 3~8mm to 1~4mm, and the length deviation can be increased from the current 5~10mm to 3~6mm.

With the continuous progress of short-flow CSP thin slab continuous casting and rolling technology, German rolling mill manufacturers have developed a cold rolling equipment matching CSP technology, namely CCM rolling mill (compact cold rolling mill), which is a two-stand reversible cold rolling mill, which can produce high-quality cold-rolled plates more economically, so that the output is greatly increased. The CCM mill is arranged with one uncoiling station and two reversible coiling machines, with the help of multi-pass rolling, with high operating flexibility. By adding an appropriate amount of rolling mill can form a tandem unit, and connected with the pickling line to form a full continuous PL-TCM production line.

SSABOxel sund plate plant in Sweden has recently developed a new concept of steel plate leveler to level the ultra-high strength steel plate treated by its quenching line. The leveling machine is equipped with an advanced and accurate flatness detection system. The main mechanical equipment includes the main leveling machine, the upper bending frame, the roller box, the transmission system and the roller box replacement system, which can realize the tilt and offset of the upper roller group Hydraulic thickness control, each mechanical equipment has carried out detailed and accurate finite element analysis and calculation to accurately judge the deformation behavior under the action of load to ensure high overall stiffness, the deformation of the equipment during the leveling process is minimized.

Danieli Wien United Company has provided a leveler for SAILBokaro steel mills in India for the levelling of cold-rolled coils for automotive sheets. This technologically advanced leveler can handle cold-rolled and hot-rolled bell-annealed coils of various steel grades, can realize dry and wet levelling, and can meet the requirements of elongation, flatness and strip surface roughness required by the automobile manufacturing industry for the production of outer plates.

In recent years, DBI Company of the United States has developed new technologies for processing high-strength and ultra-high-strength steel plates, and has successfully developed a new type of roller bending and flattening machine, which can flatten ultra-high-strength steel plates with a thickness of 3mm and a yield strength of 1550MPa. This roller bending leveler can yield all levels of the steel plate cross section, completely eliminate the "memory" effect of the steel plate, and ensure the higher straightness of the steel plate while improving the surface quality of the steel plate. Through the combination with the disc shear, mechatronics roller stacker and other equipment developed by the company, the quality standard of no residual stress and higher flatness of the steel plate is achieved.